激光熔覆Ni3Al/Cr3C2复合材料耐磨性能研究

Study on Wear Resistance of Laser Cladding Ni3Al/Cr3C2 Composites

摘要:

采用激光熔覆技术在304不锈钢基板上制备了Ni₃Al合金和Ni₃Al/Cr₃C₂(25wt.%)复合材料耐磨涂层,考察了Ni₃Al合金和Ni₃Al/Cr₃C₂熔覆层的显微组织、硬度及耐磨性能。结果表明,Ni₃Al/Cr₃C₂熔覆层显微组织由基体γ"-Ni₃Al相和原位自生M₇C₃(M=Cr,Fe)型碳化物组成,且细小近圆形的M₇C₃弥散分布在γ"-Ni₃Al基体中。与Ni₃Al合金熔覆层相比较,Ni₃Al/Cr₃C₂熔覆层显微硬度提高了近2.5倍。650℃时,其磨损量仅为对比材料蠕墨铸铁的28%左右。因此,激光熔覆制备Ni₃Al/Cr₃C₂复合材料熔覆层具有良好的耐磨性能。

Abstract:

The wear resistant coatings of Ni₃Al alloy and Ni₃Al/Cr₃C₂ composites were prepared on 304 stainless steel substrate by laser cladding technique. The microstructure, hardness and wear resistance of Ni₃Al alloy and Ni₃Al/Cr₃C₂ composites were investigated. The results show that the microstructure of the cladding layer of Ni₃Al/Cr₃C₂ consists of matrix γ"-Ni₃Al phase and in-situ self-generated M₇C₃ (M=Cr,Fe) type carbides, and the fine near-circular M₇C₃ is dispersed in γ"- Ni₃Al matrix. Compared with the Ni₃Al alloy cladding layer, the micro-hardness of the Ni₃Al/Cr₃C₂ composites cladding layer is increased by 2.5 times, and the weight loss is only 28% of the vermicular graphite cast iron. Therefore, the laser cladding Ni₃Al/Cr₃C₂ composite cladding layer has good wear resistance.