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研制新型FeMnCrAl/WC粉芯丝材,用高速电弧喷涂技术在20钢表面制备FeMnCrAl/WC涂层,结合金相、显微硬度、X射线衍射、场发射扫描电镜、能谱分析等方法对涂层的组织结构、抗热震性能及热震失效机理进行研究分析。结果表明:FeMnCrAl/WC涂层主要由不同结构特征的Fe基固溶体相的凝片叠加而成,中间夹杂着氧化物相、未熔颗粒和孔隙;其显微硬度(HV0.1)为4520MPa,800℃,15min加热-急冷法的热震抗力为26次;其热震失效机理为:循环热应力促使疲劳裂纹在氧化物区域起源和扩展,使涂层与基体结合力明显降低,导致涂层脱落。
A new type of FeMnCrAl / WC cored wire was developed. The FeMnCrAl / WC coating was prepared on the surface of 20 steel by high speed arc spraying. The microstructure of FeMnCrAl / WC coating was studied by metallographic examination, microhardness test, XRD, field emission scanning electron microscopy and energy spectrum analysis Layer structure, thermal shock resistance and thermal shock failure mechanism for research and analysis. The results show that the FeMnCrAl / WC coating is mainly composed of the aggregates of the agglomerates of the Fe-based solid solution phases with different structural features. The micro-hardness (HV0.1) of the FeMnCrAl / WC coating is 4520 MPa, The thermal shock resistance of the heating-quenching method is 26 times at 800 ℃ and 15 min. The thermal shock failure mechanism is that cyclic thermal stress causes the origin and expansion of the fatigue crack in the oxide region, resulting in a marked decrease of the bonding strength between the coating and the substrate, Off.