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利用等离子堆焊技术在304L钢板表面制备了添加Nb粉的Ni40合金堆焊层,并对堆焊层的微观组织、显微硬度和耐磨性进行研究。结果表明,堆焊层组织主要由γ-Ni树枝晶、枝晶间的共晶组织、弥散分布的Nb C颗粒、硼化物和碳化物等相组成。由于增强相Nb C颗粒在堆焊层中均匀分布,使Nb/Ni40复合合金堆焊层与纯Ni40合金堆焊层相比,显微硬度提高约40%(平均达到448 HV0.3),耐磨性也提高约37.5%。
The Ni40 alloy surfacing layer with Nb powder was prepared on the surface of 304L steel by plasma surfacing technique. The microstructure, microhardness and wear resistance of the surfacing layer were studied. The results show that the surfacing layer consists mainly of γ-Ni dendrites, eutectic structures of dendrites, dispersed Nb C particles, borides and carbides. Due to the uniform distribution of reinforcing phase Nb C particles in the surfacing layer, the microhardness of the Nb / Ni40 composite surfacing layer increases by about 40% (average 448 HV0.3) compared with pure Ni 40 alloy surfacing layer, Grindability also increased by about 37.5%.