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Microstructure Features and High Temperature Oxidation Resistance of In-Situ TiN-Ti Composite Coatings by Plasma Transferred Arc Welding

School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
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Materials 2020, 13(21), 4882; https://doi.org/10.3390/ma13214882
Received: 27 September 2020 / Revised: 27 October 2020 / Accepted: 28 October 2020 / Published: 30 October 2020
In order to improve the high temperature oxidation resistance of Ti6Al4V alloy, the in-situ TiN-Ti composite coatings were prepared with Ti-Cr-Ni-Nb powders by plasma transferred arc welding. Nitrogen gas was used as the transport gas and provided N source for the formation reaction of TiN. Microstructure features and high temperature oxidation behaviors of the composite coatings were studied. The phases in the composite coatings were TiN, Ti, CrN, and NiTi. It was clearly observed that in-situ TiN particles were evenly distributed in the Ti matrix. A little Nb atom dissolved in TiN particles, and others dissolved in the Ti matrix. By comparing the curve of Ti6Al4V alloy to that of the composite coatings, the oxidation mass gain of the composite coatings was comparatively less. The oxidation film of the composite coatings was smooth and compact, and no crack was visibly observed. Based on the results of the high temperature tests, the composite coatings exhibited superior high temperature oxidation resistance than Ti6Al4V alloy both at 650 °C and at 850 °C. View Full-Text
Keywords: high temperature oxidation; composite coatings; microstructure; in-situ high temperature oxidation; composite coatings; microstructure; in-situ
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MDPI and ACS Style

Chen, M.; Shi, B.; Huang, S.; Qin, X.; Feng, Y.; Yu, Z. Microstructure Features and High Temperature Oxidation Resistance of In-Situ TiN-Ti Composite Coatings by Plasma Transferred Arc Welding. Materials 2020, 13, 4882. https://doi.org/10.3390/ma13214882

AMA Style

Chen M, Shi B, Huang S, Qin X, Feng Y, Yu Z. Microstructure Features and High Temperature Oxidation Resistance of In-Situ TiN-Ti Composite Coatings by Plasma Transferred Arc Welding. Materials. 2020; 13(21):4882. https://doi.org/10.3390/ma13214882

Chicago/Turabian Style

Chen, Mengying, Baoming Shi, Shiming Huang, Xuefei Qin, Yuan Feng, and Zhaorui Yu. 2020. "Microstructure Features and High Temperature Oxidation Resistance of In-Situ TiN-Ti Composite Coatings by Plasma Transferred Arc Welding" Materials 13, no. 21: 4882. https://doi.org/10.3390/ma13214882

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