Effect of induced cladding temperature on high temperature oxidation resistance of FeCoCrNiMoBSi high entropy alloy coating

doi:10.13251/j.issn.0254-6051.2023.06.009

Abstract

Abstract: In order to solve the oxidation problem of ultra-supercritical boiler tubes and other high temperature components under extreme high temperature conditions, the feasibility of the preparation process of high temperature oxidation resistant FeCoCrNiMoBSi high entropy alloy coating was explored. Three kinds of FeCoCrNiMoBSi high entropy alloy coatings were prepared on 15CrMo substrate by flame thermal spraying combined with induction cladding at different temperatures, as well as the high temperature oxidation tests were carried out on the three kinds of coatings and the substrate respectively. The phase composition, microstructure and elemental composition of the coatings before and after oxidation were compared by means of metallographic observation, XRD, SEM and EDS analysis, their high temperature oxidation performance was analyzed. The results show that the oxidation kinetics curves of the coatings claded at 990, 1020 and 1050 ℃ all follow the parabola rule. After oxidation at 900 ℃ for 120 h, the oxidation mass gain of the above three coatings is 0.58, 0.50 and 0.54 mg/cm² respectively, while the oxidation mass gain of the substrate is 73.28 mg/cm², which is about 146 times of the oxidation mass gain of the coating. It can be seen that the high temperature oxidation resistance of the coating is much better than that of the substrate, and the coating melted at 1020 ℃ has the best oxidation resistance.

Key words: induction fusion coating, high entropy alloy coating, oxidation resistance at high temperature, oxidation kinetics

CLC Number:

TG172

Zhang Xiaoxian, Xie Fang, Zhai Changsheng, Liu Gang, Peng Yinli, Li Ben, Wu Bingbing, Cai Guangyu. Effect of induced cladding temperature on high temperature oxidation resistance of FeCoCrNiMoBSi high entropy alloy coating[J]. Heat Treatment of Metals, 2023, 48(6): 52-57.

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