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Micro-scale mechanical characterization of Inconel cermet coatings deposited by laser cladding
Caracterización mecánica a escala microscópica de recubrimientos cermet de Inconel depositados mediante plaqueado láser
Chao Changa, Davide Verdib, Miguel Angel Garridob, Jesus Ruiz-Herviasa,
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jesus.ruiz@upm.es

Corresponding author.
a Departamento de Ciencia de Materiales, UPM, E.T.S.I. Caminos, Canales y Puertos, c/ Profesor Aranguren, 5, E-28040 Madrid, Spain
b Departamento de Tecnología Química y Ambiental, Tecnología Química y Energética y Tecnología Mecánica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, c/ Tulipán s/n Móstoles, Madrid, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Cermet coatings were developed to protect the metallic substrate in high-temperature applications&#46; The idea is to combine the hardness&#44; oxidation resistance and high melting temperature of ceramic particles with the ductility&#44; toughness and high thermal conductivity of metals&#46; Different combinations of metal alloys and ceramics were blended and deposited to obtain cermet coatings <a class="elsevierStyleCrossRefs" href="#bib0150">&#91;1&#44;2&#93;</a>&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Nickel-based superalloys are characterized by high-temperature oxidation and corrosion resistance&#46; The commercial name Inconel is used to identify a group of Ni-based superalloys mainly composed by Ni and Cr&#46; These alloys were demonstrated to be suitable to be deposited as a coating by laser cladding to protect substrate materials&#44; like steel <a class="elsevierStyleCrossRefs" href="#bib0160">&#91;3&#8211;5&#93;</a>&#46; One way to improve the tribological properties of metallic coatings applied by laser cladding is to introduce ceramic particles in the filler material <a class="elsevierStyleCrossRef" href="#bib0175">&#91;6&#93;</a>&#46; It has been shown that Inconel 625 and Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> particles could be used for this purpose <a class="elsevierStyleCrossRef" href="#bib0180">&#91;7&#93;</a>&#46; The microstructure&#44; the wear behaviour&#44; and the mechanical properties of Inconel coatings have been studied in the literature <a class="elsevierStyleCrossRefs" href="#bib0165">&#91;4&#44;7&#8211;16&#93;</a>&#46; Additionally&#44; a recent study on the fracture and failure mechanisms of Ni-base laser cladding coatings was performed using in situ tensile tests <a class="elsevierStyleCrossRef" href="#bib0230">&#91;17&#93;</a>&#46; However&#44; few researches about the local mechanical behaviour in a micro-scale of Inconel cermet coatings have been carried out&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">The aim of this work is to study the mechanical properties in the micro-scale of Inconel 625-Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> cermet coatings deposited by laser cladding&#46; The elastic-plastic properties of the cermet matrix obtained by depth-sensing indentation &#40;DSI&#41; were compared with those of an Inconel 600 bulk specimen&#46; In addition&#44; for a more in situ analysis of the coatings&#44; the properties of unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> ceramic particles&#44; embedded in the in the cermet matrix&#44; were also evaluated by DSI&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Materials and experimental procedures</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Materials</span><p id="par0020" class="elsevierStylePara elsevierViewall">Inconel 625-Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> cermet coating was deposited by laser cladding onto Gr22 ferritic steel &#40;ASTM A387&#41;&#46; Inconel 625 and Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> powders were supplied by Sulzer-Metco &#40;MetcoClad 625 and Metco 70C-NS&#44; respectively&#41;&#46; The composition of Inconel 625 powder and the Inconel 600 bulk are presented in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46; The Inconel 625 powders were mechanically mixed with the 20<span class="elsevierStyleHsp" style=""></span>wt&#37; of Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> before processing the cermet coatings&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Experimental procedure</span><p id="par0025" class="elsevierStylePara elsevierViewall">A Rofin-Dilas High-Power Diode Laser &#40;HPDL&#41; with a wavelength of 940<span class="elsevierStyleHsp" style=""></span>nm and a maximum output power of 1300<span class="elsevierStyleHsp" style=""></span>W was used&#46; Argon was applied as a protective and powder carrier gas&#46; In order to deposit the cermet coatings&#44; the laser beam power was fixed at 900<span class="elsevierStyleHsp" style=""></span>W&#44; the scanning speed at 15<span class="elsevierStyleHsp" style=""></span>mm&#47;s&#44; the powder feeding rate at 16&#46;5<span class="elsevierStyleHsp" style=""></span>g&#47;min&#44; and the flux of Ar between 14 and 15<span class="elsevierStyleHsp" style=""></span>l&#47;min&#46; The substrates were coated by 10 single clad tracks with a 40&#37; overlap between two adjacent tracks <a class="elsevierStyleCrossRef" href="#bib0180">&#91;7&#93;</a>&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Metallographic samples were prepared in plain-view section&#46; The coated specimens were grounded with SiC paper up to 1200<span class="elsevierStyleHsp" style=""></span>grit to remove the superficial roughness of the coatings&#46; Successively&#44; they were polished in a diamond slurry of up to 1<span class="elsevierStyleHsp" style=""></span>&#956;m nominal size&#46; Finally&#44; the polished surfaces were cleaned in deionised water and then by ultrasound in acetone and propanol&#46; The same procedure was followed to obtain a polished surface of the Inconel 600 bulk sample&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Depth sensing indentations tests &#40;DSI&#41; were performed with a Nanoindenter XP &#40;MTS systems Co&#46;&#41;&#44; on the polished surfaces of the samples&#44; by using the continuous stiffness measurement methodology &#40;CSM&#41; <a class="elsevierStyleCrossRef" href="#bib0235">&#91;18&#93;</a>&#46; Continuous loading and unloading cycles were conducted during the loading branch by imposing a small dynamic oscillation of 2<span class="elsevierStyleHsp" style=""></span>nm and 45<span class="elsevierStyleHsp" style=""></span>Hz on the displacement signal and measuring the amplitude and phase of the corresponding force&#46; Consequently&#44; the contact stiffness was continuously measured as a function of the penetration depth during the experiment&#46; Two different batches of indentation tests were carried out on Inconel bulk and cermet samples&#46; For each batch&#44; an indentation matrix of 10<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>10 indentations&#44; spaced 50<span class="elsevierStyleHsp" style=""></span>microns between them&#44; was performed in displacement control&#46; The first batch of indentation tests was carried out using a Berkovich diamond indenter with a tip radius of 50<span class="elsevierStyleHsp" style=""></span>nm&#46; A maximum penetration depth of 1000<span class="elsevierStyleHsp" style=""></span>nm was selected to perform the DSI tests with the Berkovich tip&#46; The aim of these tests was to obtain values of Young&#39;s modulus &#40;E&#41; and hardness &#40;H&#41; of the studied materials&#46; Both properties were obtained by following the Oliver&#8211;Pharr methodology <a class="elsevierStyleCrossRef" href="#bib0240">&#91;19&#93;</a>&#46; The other batch of indentation tests was conducted using a spherical diamond indenter with a tip radius of 10<span class="elsevierStyleHsp" style=""></span>&#956;m&#46; The aim of these tests was to study the local plastic properties and to obtain the indentation stress&#8211;strain curve of both samples&#46; A maximum penetration depth of 1500<span class="elsevierStyleHsp" style=""></span>nm was selected to perform the DSI tests with the spherical tip&#46; Prior to making the Berkovich indentations&#44; a tip calibration procedure was carried out using the bulk Inconel 600 alloy as the reference material&#44; according to the CSM methodology <a class="elsevierStyleCrossRefs" href="#bib0160">&#91;3&#44;19&#44;20&#93;</a>&#46; The nominal elastic modulus was set to 214<span class="elsevierStyleHsp" style=""></span>GPa and the real contact area of the indenter was iteratively obtained through the following equation&#46;<elsevierMultimedia ident="eq0005"></elsevierMultimedia>where ci are constants determined by curve fitting procedure&#46; The first term was set to 24&#46;5 for an ideal Berkovich indenter&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">In addition&#44; Vicker microhardness indentation tests were carried out on the polished surfaces of the studied materials&#44; with a maximum load of 300<span class="elsevierStyleHsp" style=""></span>gf and a dwell time of 12<span class="elsevierStyleHsp" style=""></span>s&#46;</p></span></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Results and discussion</span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">DSI tests with Berkovich indenter tip</span><p id="par0045" class="elsevierStylePara elsevierViewall">In a previous work <a class="elsevierStyleCrossRef" href="#bib0180">&#91;7&#93;</a>&#44; the microstructure of the cermet matrix was analyzed by scanning electron microscopy &#40;SEM&#41; and transmission electron microscopy &#40;TEM&#41;&#46; Unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> ceramic particles were randomly distributed in the Inconel matrix&#46; Additionally&#44; Cr-rich carbides of stoichiometry M<span class="elsevierStyleInf">7</span>C<span class="elsevierStyleInf">3</span>&#44; radially distributed around the unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> particles&#44; were also observed&#46; They were formed in situ during the laser cladding process&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a> shows a representative indentation load vs&#46; penetration depth curves obtained from the DSI tests performed with the Berkovich tip&#46; The indentation loads at the maximum penetration of 1000<span class="elsevierStyleHsp" style=""></span>nm for the tests done in the cermet matrix were twice as much those obtained on Inconel bulk&#46; Additionally&#44; the Cr3C2 carbides showed the highest indentation loads&#44; almost four times those on Inconel bulk&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0055" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a> shows representative examples of Young&#39;s modulus vs&#46; penetration depth and hardness vs&#46; penetration depth curves obtained in the DSI tests&#46; The Young&#39;s modulus of the studied materials does not change considerably with the penetration depth&#46; Examples of results of the variations of the hardness with the penetration depth are shown in <a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#40;b&#41;&#44; &#40;d&#41;&#44; and &#40;f&#41;&#46; The unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> ceramic particles showed almost constant values of hardness with the penetration depth&#46; However&#44; the cermet matrix and the Inconel 600 bulk showed a continuous decreasing tendency of the hardness values with the penetration depth&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0060" class="elsevierStylePara elsevierViewall">As the values of <span class="elsevierStyleItalic">E</span> remain quite constant&#44; it is possible to discard the occurrence of calibration error in the area function of the indenter tip in Eq&#46; <a class="elsevierStyleCrossRef" href="#eq0005">&#40;1&#41;</a>&#46; Consequently&#44; the hardness evolution observed with the penetration depth may be a material response to the indentation process&#46; This phenomenon is known as indentation size effect &#40;ISE&#41; <a class="elsevierStyleCrossRef" href="#bib0250">&#91;21&#93;</a> and the hardness values obtained on the cermet coating could be affected by this effect&#46; Different models have been developed to analyze the ISE and calculate the asymptotic hardness &#40;<span class="elsevierStyleItalic">H</span><span class="elsevierStyleInf">0</span>&#41; at the fully plastic condition&#46; This value of the hardness is comparable to the Vickers one at macroscale&#46; Nix and Gao <a class="elsevierStyleCrossRef" href="#bib0250">&#91;21&#93;</a> proposed a methodology to determine this asymptotic hardness&#46; Due to the very high strain gradient that is induced in the sample during indentation with sharp tips&#44; Geometrically Necessary Dislocations &#40;GNDs&#41; are produced in the indentation volume&#46; The GND&#39;s are added to the Statistically Stored Dislocations &#40;SSD&#39;s&#41; related to the equivalent strain reached in the test&#46; As a result&#44; the dislocation density increases and thus justifies the hardening effect observed here&#46; Moreover&#44; the smaller the size of the indentation&#44; the more important the strain gradient appears to be&#46; Hence&#44; the hardening effect becomes more noticeable as the indentation size is reduced&#46; By applying the model developed by Nix and Gao&#44; Eq&#46; <a class="elsevierStyleCrossRef" href="#eq0010">&#40;2&#41;</a> can be used to describe ISE <a class="elsevierStyleCrossRef" href="#bib0255">&#91;22&#93;</a>&#58;<elsevierMultimedia ident="eq0010"></elsevierMultimedia>where <span class="elsevierStyleItalic">H</span> represents the apparent hardness&#59; <span class="elsevierStyleItalic">H</span><span class="elsevierStyleInf">0</span> the asymptotic hardness&#59; <span class="elsevierStyleItalic">h</span> the penetration depth&#44; and <span class="elsevierStyleItalic">h</span>&#42; is a characteristic length that depends on the properties of the indented material and the indenter geometry&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">Eq&#46; <a class="elsevierStyleCrossRef" href="#eq0010">&#40;2&#41;</a> implies that a plot of <span class="elsevierStyleItalic">H</span><span class="elsevierStyleSup">2</span> vs&#46; 1&#47;h results in a straight line that will intercept the <span class="elsevierStyleItalic">y</span>-axis at <span class="elsevierStyleItalic">H</span><span class="elsevierStyleInf">0</span><span class="elsevierStyleSup">2</span>&#46; <a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a> shows a representative plot of <span class="elsevierStyleItalic">H</span><span class="elsevierStyleSup">2</span> vs&#46; 1&#47;h for the Inconel 600 bulk &#40;a&#41; and cermet matrix &#40;b&#41;&#44; respectively&#46; A very good linear fitting of the data is obtained in accordance with the Nix and Gao model&#46; This behaviour has also been reported in the zirconium <a class="elsevierStyleCrossRef" href="#bib0260">&#91;23&#93;</a>&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0070" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a> summarizes the average hardness measured from DSI tests done with the Berkovich indenter&#44; the values of <span class="elsevierStyleItalic">H</span><span class="elsevierStyleInf">0</span> calculated with the Nix and Gao model&#44; and finally the values of Vicker microhardness &#40;HV&#41; that could be used to verify if the values of <span class="elsevierStyleItalic">H</span><span class="elsevierStyleInf">0</span> were correctly calculated&#46; The asymptotic hardness values obtained on Inconel bulk and cermet coating are similar to those obtained by Vickers microhardness tests&#46; In addition&#44; the asymptotic hardness value of the cermet matrix is 60&#37; higher than that of the Inconel 600 bulk&#46; The higher hardness value of the cermet matrix may be due to the formation of the M<span class="elsevierStyleInf">7</span>C<span class="elsevierStyleInf">3</span> carbides previously described&#46; The Young&#39;s modulus of the cermet matrix was 15&#37; higher regarding to that obtained on the Inconel 600 bulk&#46; It is possible to suppose that M<span class="elsevierStyleInf">7</span>C<span class="elsevierStyleInf">3</span> carbides&#44; embedded into the Inconel matrix&#44; promote a load distribution phenomena that results in higher values of E measured&#46; The values of <span class="elsevierStyleItalic">E</span> obtained for the Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> particles are similar to those reported by others authors &#40;<span class="elsevierStyleItalic">E</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>373<span class="elsevierStyleHsp" style=""></span>GPa&#41; <a class="elsevierStyleCrossRef" href="#bib0265">&#91;24&#93;</a>&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">DSI tests with spherical indenter tip</span><p id="par0075" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a> shows representative load vs&#46; penetration depth curves obtained in DSI tests carried out using the spherical indenter tip&#46; A higher indentation load is needed for the cermet matrix with respect to the Inconel 600 bulk to achieve the same penetration depth&#44; in agreement with the results obtained using the Berkovich tip&#46; It should be noted that there are multiple discontinuities in the curve of the unmelt Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> particle&#46; This phenomenon is known as &#8220;pop-in&#8221; and it is associated to the formation of cracks in the material during the tests&#46; Materials with hexagonal lattice structure&#44; like the Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> ceramic particles used in this work&#44; may present this behaviour&#46; Others examples of materials showing this phenomena are the sapphire&#44; the GaN&#44; and the ZnO <a class="elsevierStyleCrossRef" href="#bib0270">&#91;25&#93;</a>&#46; In the results shown in <a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>&#44; the first &#8220;pop-in&#8221; happens at an indentation depth around 400<span class="elsevierStyleHsp" style=""></span>nm&#44; the second one at 550<span class="elsevierStyleHsp" style=""></span>nm&#44; and the third one around 700<span class="elsevierStyleHsp" style=""></span>nm&#46; There is no pop-in phenomena during the unloading process&#46; For the analysis of the results only the data previous to the first pop-in event were used&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0080" class="elsevierStylePara elsevierViewall">Indentation tests with a spherical tip represent the best choice to characterize the strain hardening which offers a gradual transition from elastic to elastic&#8211;plastic regime&#46; The indentation stress vs&#46; strain curve can be obtained using the model proposed by S&#46;R&#46; Kalidindi et al&#46; <a class="elsevierStyleCrossRef" href="#bib0275">&#91;26&#93;</a>&#46; The indentation stress &#40;<span class="elsevierStyleItalic">&#963;</span><span class="elsevierStyleInf">ind</span>&#41; and the indentation strain &#40;<span class="elsevierStyleItalic">¿</span><span class="elsevierStyleInf">ind</span>&#41; can be expressed respectively as&#58;<elsevierMultimedia ident="eq0015"></elsevierMultimedia><elsevierMultimedia ident="eq0020"></elsevierMultimedia>where <span class="elsevierStyleItalic">P</span> is the applied load&#44; <span class="elsevierStyleItalic">a</span> the contact radius&#44; and <span class="elsevierStyleItalic">h</span> is the penetration depth&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">The value of Young&#39;s modulus of the studied materials was previously measured using the Oliver&#8211;Pharr method on the Berkovich indentation data&#44; the contact radius <span class="elsevierStyleItalic">a</span> could be estimated according to the Sneddon&#39;s equation <a class="elsevierStyleCrossRef" href="#bib0280">&#91;27&#93;</a>&#58;<elsevierMultimedia ident="eq0025"></elsevierMultimedia>where <span class="elsevierStyleItalic">S</span><span class="elsevierStyleInf">u</span> represent the harmonic contact stiffness obtained by the CSM methodology and <span class="elsevierStyleItalic">E</span><span class="elsevierStyleInf">r</span> is the reduced Young&#39;s modulus&#44; that could be express as a function of the Young&#39;s modulus and Poisson&#39;s ratios of the studied material &#40;<span class="elsevierStyleItalic">E</span>&#44; <span class="elsevierStyleItalic">&#957;</span>&#41; and the indenter tip &#40;<span class="elsevierStyleItalic">E</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">i</span></span>&#44; <span class="elsevierStyleItalic">&#957;</span><span class="elsevierStyleInf"><span class="elsevierStyleItalic">i</span></span>&#41;&#58;<elsevierMultimedia ident="eq0030"></elsevierMultimedia></p><p id="par0090" class="elsevierStylePara elsevierViewall">The slope of the initial linear part of the indentation stress-strain curves&#44; obtained for the cermet matrix and the Inconel 600 bulk&#44; is approximately equal to the reduced Young&#39;s modulus obtained from the Oliver&#8211;Pharr analysis of the Berkovich indentation tests &#40;in the zoom parts in <a class="elsevierStyleCrossRef" href="#fig0025">Fig&#46; 5</a>&#41;&#46; The plastic regime of the indentation stress&#8211;strain curves were fitted to a Hollomon equation <a class="elsevierStyleCrossRef" href="#bib0285">&#91;28&#93;</a>&#46; The indentation stress&#8211;strain curve for cermet matrix shows a strain hardening value which is more than twice the one obtained for the Inconel 600 bulk&#46; Probably&#44; the M<span class="elsevierStyleInf">7</span>C<span class="elsevierStyleInf">3</span> carbides&#44; distributed around the unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> particles&#44; could produce a distortional effect on the cermet matrix and consequently&#44; they may produce a hardening effect&#46; This result is in agreement to the one obtained from the Berkovich tests &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia><p id="par0095" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0030">Fig&#46; 6</a>&#46; shows the indentation stress&#8211;strain curve for unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> ceramic particles&#46; The fitting was limited to those under the first &#8220;pop-in&#8221; event&#46; The indentation stress&#8211;strain curve is linear with a slope that corresponds to the Young&#39;s modulus &#40;364<span class="elsevierStyleHsp" style=""></span>GPa&#41; of the unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> particles&#46; The critical point marked in red in the curve is the first &#8220;pop-in&#8221; point&#44; at which initial cracking takes place&#46; The mean pressure at this point is about 18<span class="elsevierStyleHsp" style=""></span>GPa which is consistent with the values of hardness obtained from Vicker indentations in the literature <a class="elsevierStyleCrossRefs" href="#bib0265">&#91;24&#44;29&#93;</a>&#46;</p><elsevierMultimedia ident="fig0030"></elsevierMultimedia></span></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Conclusions</span><p id="par0100" class="elsevierStylePara elsevierViewall">In this study&#44; depth-sensing indentation tests were performed with Berkovich and spherical tips on Inconel 625-Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> cermet coatings in order to evaluate their elastic-plastic properties in the micro-scale&#46; An Inconel 600 bulk specimen was used as reference sample for the calibration of the contact area equation&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">The Nix and Gao model has been successfully employed to account for the indentation size effect &#40;ISE&#41; in the hardness measurements on the cermet matrix and the Inconel 600 bulk&#46; The asymptotic hardness of the cermet matrix is equal to 3&#46;85<span class="elsevierStyleHsp" style=""></span>GPa&#44; which is 60&#37; higher than that of the Inconel 600 bulk &#40;2&#46;4<span class="elsevierStyleHsp" style=""></span>GPa&#41;&#46; The Young&#39;s modulus does not depend on the indentation depth and its value for the cermet matrix is 243<span class="elsevierStyleHsp" style=""></span>GPa&#44; whereas for the Inconel 600 bulk is equal to 211<span class="elsevierStyleHsp" style=""></span>GPa&#46; The indentation stress&#8211;strain curve in the plastic regime for the cermet matrix showed a strain hardening value which is more than twice the one obtained for the Inconel 600 bulk&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">The unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> ceramic particles were also characterized by depth-sensing indentation tests with an spherical tip&#46; In this case&#44; the hardness values &#40;around 23<span class="elsevierStyleHsp" style=""></span>GPa&#41; did not show any indentation size effect&#46; The Young&#39;s modulus was equal to 373<span class="elsevierStyleHsp" style=""></span>GPa&#44; in agreement with published results&#46; However&#44; there were multiple &#8220;pop-in&#8221; events in the load&#8211;displacement curve associated to crack initiation in the material&#46; The first &#8220;pop-in&#8221; event was observed at a penetration depth of about 400<span class="elsevierStyleHsp" style=""></span>nm and the corresponding average pressure &#40;18<span class="elsevierStyleHsp" style=""></span>GPa&#41; is similar to the hardness measured from Vicker indentations in the literature&#46;</p></span></span>"
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              "titulo" => "DSI tests with Berkovich indenter tip"
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              "titulo" => "DSI tests with spherical indenter tip"
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            0 => "Cermet"
            1 => "Inconel coating"
            2 => "Elastic-plastic properties"
            3 => "Depth sensing indentations"
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            0 => "Cermet"
            1 => "Recubrimiento Inconel"
            2 => "Propiedades elasto-pl&#225;sticas"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">In this study&#44; an Inconel 625-Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> cermet coating was deposited on a steel alloy by laser cladding&#46; The elastic and plastic mechanical properties of the cermet matrix were studied by the depth sensing indentation &#40;DSI&#41; in the micro scale&#46; These results were compared with those obtained from an Inconel 600 bulk specimen&#46; The values of Young&#39;s modulus and hardness of cermet matrix were higher than those of an Inconel 600 bulk specimen&#46; Meanwhile&#44; the indentation stress&#8211;strain curve of the cermet matrix showed a strain hardening value which was more than twice the one obtained for the Inconel 600 bulk&#46; Additionally&#44; the mechanical properties of unmelted Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> ceramic particles&#44; embedded in the cermet matrix were also evaluated by DSI using a spherical indenter&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">En este estudio&#44; se han depositado recubrimientos <span class="elsevierStyleItalic">cermet</span> de Inconel 625-Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> sobre acero mediante plaqueado l&#225;ser&#46; Las propiedades mec&#225;nicas elasto-pl&#225;sticas de la matriz de <span class="elsevierStyleItalic">cermet</span> fueron estudiadas mediante el proceso de nanoindentaci&#243;n &#40;DSI&#41; a escala microsc&#243;pica&#46; Los resultados obtenidos se han comparado con los correspondientes a una muestra masiva de Inconel 600&#46; Los valores del m&#243;dulo de Young y la dureza de la matriz de cermet son considerablemente mayores que los de la muestra masiva de Inconel 600&#46; La curva de tensi&#243;n-deformaci&#243;n de la matriz de <span class="elsevierStyleItalic">cermet</span> presenta un valour de endurecimiento por deformaci&#243;n que es m&#225;s del doble del obtenido para el Inconel 600 en masa&#46; Adem&#225;s&#44; se determinaron las propiedades mec&#225;nicas de las part&#237;culas cer&#225;micas de Cr<span class="elsevierStyleInf">3</span>C<span class="elsevierStyleInf">2</span> sin fundir en la matriz de <span class="elsevierStyleItalic">cermet</span> mediante nanoindentaci&#243;n usando un indentador esf&#233;rico&#46;</p></span>"
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        "texto" => "<p id="par0115" class="elsevierStylePara elsevierViewall">One of the authors&#44; Chao Chang&#44; appreciates the financial support provided by the Chinese Scholarship Council &#40;CSC&#41;&#46; This work was supported by the project BIA 2014-53314R&#46;</p>"
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Article information
ISSN: 03663175
Original language: English
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2019 December 18 9 27
2019 November 18 6 24
2019 October 17 8 25
2019 September 27 13 40
2019 August 12 5 17
2019 July 16 22 38
2019 June 48 42 90
2019 May 117 66 183
2019 April 74 28 102
2019 March 6 9 15
2019 February 13 14 27
2019 January 6 5 11
2018 December 8 4 12
2018 November 17 6 23
2018 October 15 13 28
2018 September 22 8 30
2018 August 12 3 15
2018 July 9 4 13
2018 June 9 4 13
2018 May 12 6 18
2018 April 18 9 27
2018 March 11 0 11
2018 February 8 4 12
2018 January 11 0 11
2017 December 8 0 8
2017 November 10 3 13
2017 October 12 2 14
2017 September 16 5 21
2017 August 9 1 10
2017 July 13 1 14
2017 June 30 17 47
2017 May 32 7 39
2017 April 19 8 27
2017 March 21 52 73
2017 February 40 4 44
2017 January 19 3 22
2016 December 22 9 31
2016 November 37 5 42
2016 October 47 7 54
2016 September 57 9 66
2016 August 48 7 55
2016 July 0 4 4
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