在 Q235 钢基材表面制备 FeCoCrNiB 高熵合金涂层,涂层致密,无裂纹和气孔,由条状 M₃B 相和基体 fcc 相两相组成。 分析了涂层具有这种相组成的原因。 研究了高温退火对涂层组织结构及硬度的影响,结果表明:900 ℃ 或 1000 ℃ 退火后,涂层中析出了颗粒状和短棒状的 M₃B 相;1150 ℃ 退火后,条状、颗粒状和短棒状组织均消失,形成了粗大的块状 M₃B 相,块状组织硬度达 1188 HV;涂层具有较好的耐高温软化性能,900 ℃ 或1000 ℃ 退火后,硬度仅分别下降约 7% 和 9% 。

FeCoCrNiB high-entropy alloy coating was prepared on the Q235 steel substrate. The coating is free of crack and pore defect, which is composed of rod-like M₃B phase and fcc matrix phase. Formation mechanism of the phases was analyzed. Effects of high temperature annealing on microstructure and microhardness were investigated. The results show: after annealed at 900 ℃ and 1000 ℃ , some granular and short rod-like M₃B phase are precipitated in coating; After annealed at 1150 ℃ , rod-like, granular and short rod-like structure disappear, a blocky M₃B phase formes, the microhardness of blocly phase is 1188 HV; The coating exhibits excellent resistance to high temperature softening, the decrease of microhardness is only about 7 % and 9 % after annealed at 900 ℃ and 1000 ℃ .