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Jingjie Dai - One of the best experts on this subject based on the ideXlab platform.
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effect of process parameters on the microstructure evolution and wear property of the laser Cladding Coatings on ti 6al 4v alloy
Journal of Alloys and Compounds, 2017Co-Authors: Fei Weng, Chuanzhong Chen, Jianli Liu, Longjie Zhao, Jingjie Dai, Zhihuan ZhaoAbstract:Abstract In this paper, Co-based composite Coatings were fabricated by laser Cladding Co42 + B 4 C mixed powders on Ti-6Al-4V titanium alloy. The comprehensive effects of laser power and scanning velocity on the microstructure evolution and wear property of the laser Cladding Coatings were studied. Results indicated that the Coatings were mainly comprised of γ-Co/Ni, TiC, TiB 2 , TiB, NiTi, CoTi, CoTi 2 , and Cr 7 C 3 . With the decreasing of laser specific energy (from 12.7 kJ cm −2 to 4.9 kJ cm −2 ), the TiC dendrites and TiB particles were refined. Compared with the Ti-6Al-4V titanium alloy, the microhardness and wear resistance of the composite Coatings were enhanced obviously. Lower laser specific energy led to higher microhardness and better wear resistance owing to more TiB 2 bulks distributed in the Cladding Coating.
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microstructure and property of composite Coatings on titanium alloy deposited by laser Cladding with co42 tin mixed powders
Journal of Alloys and Compounds, 2016Co-Authors: Fei Weng, Chuanzhong Chen, Jianli Liu, Longjie Zhao, Jingjie DaiAbstract:Abstract In this study, composite Coatings were fabricated on Ti-6Al-4V alloy by laser Cladding with Co42 Co-based self-fluxing alloy and TiN mixed powders. Microstructures and wear resistance of the Cladding Coatings with 20 wt% and 30 wt% TiN addition were investigated comparatively. The composite Coatings were mainly comprised of γ-Co/Ni, CoTi, CoTi 2 , Co 3 Ti, NiTi, TiN, CrB, Cr 7 C 3 , TiC, TiB, and TiC 0.3 N 0.7 phases. The composite phase components were beneficial to the improvement of the micro-hardness and wear resistance. Results showed that the micro-hardness of the composite Coatings was 3–4 times the Ti-6Al-4V substrate and the wear resistance was enhanced as high as 18.2 times. With more TiN addition, the micro-hardness and wear resistance of the laser Cladding Coating were improved further. The microstructure, strengthening mechanism, and wear mechanism of the laser Cladding Coatings were investigated accordingly.
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microstructures and wear properties of laser Cladding co based composite Coatings on ti 6al 4v
Materials & Design, 2015Co-Authors: Fei Weng, Chuanzhong Chen, Jingjie DaiAbstract:Abstract Metal matrix composite (MMC) Coatings were fabricated on Ti–6Al–4V titanium alloy by laser Cladding. Co42 self-fluxing powder, B 4 C, SiC and Y 2 O 3 were employed as the Cladding materials. Microstructures and the wear properties of the different composite Coatings were investigated comparatively. Results showed that the laser Cladding Coatings were mainly reinforced by CoTi, CoTi 2 , NiTi, TiC, TiB 2 , TiB, Cr 7 C 3 and Ti 5 Si 3 . The micro-hardness of the Cladding Coatings were equivalent to 3–4 times the Ti–6Al–4V substrate. Laser Cladding Coating exhibiting outstanding wear resistance was fabricated with the addition of 20 wt.% B 4 C, 7 wt.% SiC and 1 wt.% Y 2 O 3 . The wear resistance was enhanced by over 10 times compared with the substrate. However, with more SiC addition (14 wt.%), a higher micro-hardness was obtained together with poor wear resistance. The wear mechanism of the Coatings was discussed by referring to the microstructures and the wear morphologies.
Fei Weng - One of the best experts on this subject based on the ideXlab platform.
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effect of process parameters on the microstructure evolution and wear property of the laser Cladding Coatings on ti 6al 4v alloy
Journal of Alloys and Compounds, 2017Co-Authors: Fei Weng, Chuanzhong Chen, Jianli Liu, Longjie Zhao, Jingjie Dai, Zhihuan ZhaoAbstract:Abstract In this paper, Co-based composite Coatings were fabricated by laser Cladding Co42 + B 4 C mixed powders on Ti-6Al-4V titanium alloy. The comprehensive effects of laser power and scanning velocity on the microstructure evolution and wear property of the laser Cladding Coatings were studied. Results indicated that the Coatings were mainly comprised of γ-Co/Ni, TiC, TiB 2 , TiB, NiTi, CoTi, CoTi 2 , and Cr 7 C 3 . With the decreasing of laser specific energy (from 12.7 kJ cm −2 to 4.9 kJ cm −2 ), the TiC dendrites and TiB particles were refined. Compared with the Ti-6Al-4V titanium alloy, the microhardness and wear resistance of the composite Coatings were enhanced obviously. Lower laser specific energy led to higher microhardness and better wear resistance owing to more TiB 2 bulks distributed in the Cladding Coating.
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microstructure and property of composite Coatings on titanium alloy deposited by laser Cladding with co42 tin mixed powders
Journal of Alloys and Compounds, 2016Co-Authors: Fei Weng, Chuanzhong Chen, Jianli Liu, Longjie Zhao, Jingjie DaiAbstract:Abstract In this study, composite Coatings were fabricated on Ti-6Al-4V alloy by laser Cladding with Co42 Co-based self-fluxing alloy and TiN mixed powders. Microstructures and wear resistance of the Cladding Coatings with 20 wt% and 30 wt% TiN addition were investigated comparatively. The composite Coatings were mainly comprised of γ-Co/Ni, CoTi, CoTi 2 , Co 3 Ti, NiTi, TiN, CrB, Cr 7 C 3 , TiC, TiB, and TiC 0.3 N 0.7 phases. The composite phase components were beneficial to the improvement of the micro-hardness and wear resistance. Results showed that the micro-hardness of the composite Coatings was 3–4 times the Ti-6Al-4V substrate and the wear resistance was enhanced as high as 18.2 times. With more TiN addition, the micro-hardness and wear resistance of the laser Cladding Coating were improved further. The microstructure, strengthening mechanism, and wear mechanism of the laser Cladding Coatings were investigated accordingly.
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microstructures and wear properties of laser Cladding co based composite Coatings on ti 6al 4v
Materials & Design, 2015Co-Authors: Fei Weng, Chuanzhong Chen, Jingjie DaiAbstract:Abstract Metal matrix composite (MMC) Coatings were fabricated on Ti–6Al–4V titanium alloy by laser Cladding. Co42 self-fluxing powder, B 4 C, SiC and Y 2 O 3 were employed as the Cladding materials. Microstructures and the wear properties of the different composite Coatings were investigated comparatively. Results showed that the laser Cladding Coatings were mainly reinforced by CoTi, CoTi 2 , NiTi, TiC, TiB 2 , TiB, Cr 7 C 3 and Ti 5 Si 3 . The micro-hardness of the Cladding Coatings were equivalent to 3–4 times the Ti–6Al–4V substrate. Laser Cladding Coating exhibiting outstanding wear resistance was fabricated with the addition of 20 wt.% B 4 C, 7 wt.% SiC and 1 wt.% Y 2 O 3 . The wear resistance was enhanced by over 10 times compared with the substrate. However, with more SiC addition (14 wt.%), a higher micro-hardness was obtained together with poor wear resistance. The wear mechanism of the Coatings was discussed by referring to the microstructures and the wear morphologies.
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effect of ceo2 and y2o3 on microstructure bioactivity and degradability of laser Cladding cao sio2 Coating on titanium alloy
Colloids and Surfaces B: Biointerfaces, 2015Co-Authors: Diangang Wang, Chuanzhong Chen, Fei WengAbstract:Abstract To solve the lack of strength of bulk biomaterials for load-bearing applications and improve the bioactivity of titanium alloy (Ti–6Al–4V), CaO–SiO2 Coatings on titanium alloy were fabricated by laser Cladding technique. The effect of CeO2 and Y2O3 on microstructure and properties of laser Cladding Coating was analyzed. The cross-section microstructure of ceramic layer from top to bottom gradually changes from cellular–dendrite structure to compact cellular crystal. The addition of CeO2 or Y2O3 refines the microstructure of the ceramic layer in the upper and middle regions. The refining effect on the grain is related to the kinds of additives and their content. The Coating is mainly composed of CaTiO3, CaO, α-Ca2(SiO4), SiO2 and TiO2. Y2O3 inhibits the formation of CaO. After soaking in simulated body fluid (SBF), the calcium phosphate layer is formed on the Coating surface, indicating the Coating has bioactivity. After soaking in Tris–HCl solution, the samples doped with CeO2 or Y2O3 present a lower weight loss, indicating the addition of CeO2 or Y2O3 improves the degradability of laser Cladding sample.
Chuanzhong Chen - One of the best experts on this subject based on the ideXlab platform.
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effect of process parameters on the microstructure evolution and wear property of the laser Cladding Coatings on ti 6al 4v alloy
Journal of Alloys and Compounds, 2017Co-Authors: Fei Weng, Chuanzhong Chen, Jianli Liu, Longjie Zhao, Jingjie Dai, Zhihuan ZhaoAbstract:Abstract In this paper, Co-based composite Coatings were fabricated by laser Cladding Co42 + B 4 C mixed powders on Ti-6Al-4V titanium alloy. The comprehensive effects of laser power and scanning velocity on the microstructure evolution and wear property of the laser Cladding Coatings were studied. Results indicated that the Coatings were mainly comprised of γ-Co/Ni, TiC, TiB 2 , TiB, NiTi, CoTi, CoTi 2 , and Cr 7 C 3 . With the decreasing of laser specific energy (from 12.7 kJ cm −2 to 4.9 kJ cm −2 ), the TiC dendrites and TiB particles were refined. Compared with the Ti-6Al-4V titanium alloy, the microhardness and wear resistance of the composite Coatings were enhanced obviously. Lower laser specific energy led to higher microhardness and better wear resistance owing to more TiB 2 bulks distributed in the Cladding Coating.
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microstructure and property of composite Coatings on titanium alloy deposited by laser Cladding with co42 tin mixed powders
Journal of Alloys and Compounds, 2016Co-Authors: Fei Weng, Chuanzhong Chen, Jianli Liu, Longjie Zhao, Jingjie DaiAbstract:Abstract In this study, composite Coatings were fabricated on Ti-6Al-4V alloy by laser Cladding with Co42 Co-based self-fluxing alloy and TiN mixed powders. Microstructures and wear resistance of the Cladding Coatings with 20 wt% and 30 wt% TiN addition were investigated comparatively. The composite Coatings were mainly comprised of γ-Co/Ni, CoTi, CoTi 2 , Co 3 Ti, NiTi, TiN, CrB, Cr 7 C 3 , TiC, TiB, and TiC 0.3 N 0.7 phases. The composite phase components were beneficial to the improvement of the micro-hardness and wear resistance. Results showed that the micro-hardness of the composite Coatings was 3–4 times the Ti-6Al-4V substrate and the wear resistance was enhanced as high as 18.2 times. With more TiN addition, the micro-hardness and wear resistance of the laser Cladding Coating were improved further. The microstructure, strengthening mechanism, and wear mechanism of the laser Cladding Coatings were investigated accordingly.
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microstructures and wear properties of laser Cladding co based composite Coatings on ti 6al 4v
Materials & Design, 2015Co-Authors: Fei Weng, Chuanzhong Chen, Jingjie DaiAbstract:Abstract Metal matrix composite (MMC) Coatings were fabricated on Ti–6Al–4V titanium alloy by laser Cladding. Co42 self-fluxing powder, B 4 C, SiC and Y 2 O 3 were employed as the Cladding materials. Microstructures and the wear properties of the different composite Coatings were investigated comparatively. Results showed that the laser Cladding Coatings were mainly reinforced by CoTi, CoTi 2 , NiTi, TiC, TiB 2 , TiB, Cr 7 C 3 and Ti 5 Si 3 . The micro-hardness of the Cladding Coatings were equivalent to 3–4 times the Ti–6Al–4V substrate. Laser Cladding Coating exhibiting outstanding wear resistance was fabricated with the addition of 20 wt.% B 4 C, 7 wt.% SiC and 1 wt.% Y 2 O 3 . The wear resistance was enhanced by over 10 times compared with the substrate. However, with more SiC addition (14 wt.%), a higher micro-hardness was obtained together with poor wear resistance. The wear mechanism of the Coatings was discussed by referring to the microstructures and the wear morphologies.
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effect of ceo2 and y2o3 on microstructure bioactivity and degradability of laser Cladding cao sio2 Coating on titanium alloy
Colloids and Surfaces B: Biointerfaces, 2015Co-Authors: Diangang Wang, Chuanzhong Chen, Fei WengAbstract:Abstract To solve the lack of strength of bulk biomaterials for load-bearing applications and improve the bioactivity of titanium alloy (Ti–6Al–4V), CaO–SiO2 Coatings on titanium alloy were fabricated by laser Cladding technique. The effect of CeO2 and Y2O3 on microstructure and properties of laser Cladding Coating was analyzed. The cross-section microstructure of ceramic layer from top to bottom gradually changes from cellular–dendrite structure to compact cellular crystal. The addition of CeO2 or Y2O3 refines the microstructure of the ceramic layer in the upper and middle regions. The refining effect on the grain is related to the kinds of additives and their content. The Coating is mainly composed of CaTiO3, CaO, α-Ca2(SiO4), SiO2 and TiO2. Y2O3 inhibits the formation of CaO. After soaking in simulated body fluid (SBF), the calcium phosphate layer is formed on the Coating surface, indicating the Coating has bioactivity. After soaking in Tris–HCl solution, the samples doped with CeO2 or Y2O3 present a lower weight loss, indicating the addition of CeO2 or Y2O3 improves the degradability of laser Cladding sample.
Xingwu Qiu - One of the best experts on this subject based on the ideXlab platform.
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microstructure hardness and corrosion resistance of al 2 cocrcufeniti x high entropy alloy Coatings prepared by rapid solidification
Journal of Alloys and Compounds, 2018Co-Authors: Xingwu QiuAbstract:Abstract The Al2CoCrCuFeNiTix high-entropy alloy Coatings were prepared by laser Cladding on Q235 steel surface. The microstructure, hardness and corrosion resistance were investigated by means of scanning electron microscopy with spectroscopy (SEM/EDS), transmission electron microscopy (TEM), micro/Vickers hardness tester and electrochemical workstation. Experimental results show that the Cladding Coating consists of Cladding zone (CZ), bounding zone (BZ) and heat affected zone (HAZ). Al2CoCrCuFeNiTix high-entropy alloy Coating was mainly composed of equiaxed grain; the distribution of chemical compositions is uniform. Alloy Coating exhibited high hardness due to solid solution hardening and dispersion strengthening effect, the highest surface hardness of 988 HV, about 4.5 times as much as the substrate; the passivation film on Al2CoCrCuFeNiTix high-entropy alloy Coating surface made the alloy have excellent corrosion resistance in 0.5 mol/L H2SO4 solution, the alloy Coatings were appearing repassivation except Ti1.0 alloy Coating. The Coating have good corrosion resistance in 3.5% NaCl solution because Ti elements can maintain a stable state of purification. Circular polarization curves show that the Al2CoCrCuFeNiTix high-entropy alloy Coating does not appear pitting in 0.5 mol/L H2SO4 and 3.5% NaCl solutions.
Bin Han - One of the best experts on this subject based on the ideXlab platform.
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effects of ultrasonic impact treatment on structures and properties of laser Cladding al0 5cocrfemnni high entropy alloy Coatings
Materials Chemistry and Physics, 2021Co-Authors: Qi Zhang, Bin Han, Lixin Song, Shiyi ZhangAbstract:Abstract In this research, ultrasonic impact treatment was introduced on the surfaces of laser Cladding Al0.5CoCrFeMnNi high entropy alloy Coatings. The results showed that obvious solidification boundaries with some lamellar cluster and polygonal precipitations generated inside the Cladding Coatings. After UIT for one time, a thin impacted layer with obvious plastic deformation was formed. When treated for two times, many floccules formed near the surface while with the increase of impact times evident impact tracks were found on the surface of ultrasonic impact layer due to excessive plastic deformation. In addition, original precipitations located along the solidification boundaries were broken into small ones, and the particles inside the matrix were also cracked. The minimum surface roughness and maximum surface hardness of ultrasonic impact layers can be obtained for one impact time. XRD analysis indicated that Al0.5CoCrFeMnNi Cladding Coating was composed of single FCC phase while application of UIT technology did not change the phase structure of Coatings. It also was noted that the weight losses of ultrasonic impact layers were lower than those of Cladding Coatings whilst the current density was decreased by 69.6%, 87% in the 3.5%NaCl and 1 mol/L NaOH solutions, respectively, indicating better corrosion resistance of impact layers.
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microstructure and tribological performance of sulfurizing layer prepared on the laser Cladding co based alloy Coating
Surface & Coatings Technology, 2017Co-Authors: Gang Cui, Bin Han, Jianbo Zhao, Zinan YangAbstract:Abstract Laser Cladding of Co-based alloy Coating owns excellent wear and corrosion resistances. The sulfides film fabricated by low temperature ion sulfurizing technique performs outstanding friction-reducing properties. In this study, the sulfides layer was successfully fabricated on the Co-based laser Cladding Coating by means of low temperature ion sulfurizing. The surface morphologies, microstructures and phase constituents were investigated by SEM, EDS, XRD and XPS. The results show that the surface of sulfurizing layer is loose and porous. The lubricant phases FeS and WS2 are detected in the sulfurizing composite layer. The thickness of the sulfurizing composite layer is about 3–4 μm. Tribological properties were tested by a pin-on-disc tester, and the wear mechanisms were further analyzed. The friction results indicate that the friction coefficients and wear losses of the sulfurizing composite layer are decreased remarkably in contrast to the Cladding Coating under dry condition. The sulfides layer prepared on laser Cladding Coating shows excellent performance on wear and friction-reduction. The lubricant phases of FeS and WS2 play an important role in improving the tribological performances of the sulfurizing composite layer.
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investigation on laser Cladding high hardness nano ceramic Coating assisted by ultrasonic vibration processing
Optik, 2016Co-Authors: Bin Han, Lixin Song, Yong Wang, Lanyang GuoAbstract:Abstract Laser Cladding Nickel–WC–CaF 2 Coatings with high hardness were prepared on medium carbon steel assisted by ultrasonic vibration processing. The microstructure, element distribution, phase composition and microhardness as well as wear resistance of the Cladding Coatings were investigated. It is found that ultrasonic vibration during laser Cladding could reduce the degree of WC particle aggregation. The laser Cladding Ni–WC–CaF 2 Coatings is composed of γ-(Fe, Ni) and WC particles while the Cladding Coating with ultrasonic vibration consists of γ-(Fe, Ni), Cr 23 C 6 , W 2 C and WC. In addition, the coarse dendrite has been replaced by some fine grain structure at the bonding interface. When the ultrasonic vibration power of 800 W is applied, the average microhardness of Cladding Coating increase to 1235HV 0.1 resulted from the combined effect of refined grain, dispersion strengthening from hard WC phase and solid solution strengthening. And the wear mass loss and friction coefficient of Ni–WC–CaF 2 Coating are lower than the Coating without ultrasonic vibration and the Coating with the ultrasonic vibration power of 900 W. Especially, the worn mechanism on the surface is uniform ploughing.