Publication Date:
2018
Description:
〈p〉Publication date: 15 February 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Surface and Coatings Technology, Volume 359〈/p〉
〈p〉Author(s): Fa Chang, Bingjie Cai, Chong Zhang, Biao Huang, Shuai Li, Pinqiang Dai〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉The FeCr〈sub〉x〈/sub〉CoNiB (x values in molar ration, x = 0.5–3) high-entropy alloys coatings were prepared by laser cladding on an AISI 1045 steel substrate. Annealing and high temperature oxidation experiments were performed on the FeCr〈sub〉x〈/sub〉CoNiB (x = 0.5–3) coatings at 900 °C. The phase structure, morphology, and composition of the coatings and oxidation layers were analyzed by XRD, TEM, SEM, and EDS. Results demonstrated that the FeCr〈sub〉x〈/sub〉CoNiB coatings are composed of simple face-centred cubic (FCC) phase and boride. The hardness value of the coatings is significantly improved due to the boride, which is achieved 860 HV at x = 0.5. Cr is conducive to inhibiting the coarsening of boride and enhancing the resistance of coatings to high-temperature softening. The oxidation kinetics curve of FeCr〈sub〉x〈/sub〉CoNiB coatings basically follows oxidation dynamic the parabolic law. The selective oxidation in the FeCr〈sub〉x〈/sub〉CoNiB coatings changed from the oxidation of Fe to the oxidation of Cr as an increase in Cr content, and finally formed continuous Cr〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 film. The high temperature oxidation resistance of the FeCr〈sub〉x〈/sub〉CoNiB coatings dropped with adding boron into the coatings, which improved contributing to Cr increasing. FeCr〈sub〉x〈/sub〉CoNiB coatings gain a better high temperature oxidation resistance as x ≥ 2 (33.3 at.%).〈/p〉〈/div〉
〈/div〉
Print ISSN:
0257-8972
Electronic ISSN:
1879-3347
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
