粉块厚度对汽车冲压模具激光熔覆修复涂层组织与性能的影响  

Effect of Coating Thickness on Microstructure and Properties of Wear-resistant Coating Fabricated by Laser Cladding on Automotive Atamping Die

作　　者：朱智文[1] 蒋晓斌[1] 沈言锦 

机构地区：[1]湖南化工职业技术学院,湖南株洲410151 [2]湖南汽车工程职业学院,湖南株洲412001

出　　处：《热加工工艺》2016年第4期154-156,共3页Hot Working Technology

摘　　要：以高碳铬铁,硅铁、WC粉末、钒铁、石墨以及还原铁粉等为预制合金粉末,采用激光熔覆技术,在基体表面制备耐磨性优良的涂层。借助光学显微镜、硬度计以及磨粒磨损试验机等对耐磨涂层的组织和耐磨性能进行研究分析。结果表明:随预制合金粉末块的厚度增加,初晶碳化物M_(23)C_6逐渐增加,指纹状的共晶组织则慢慢减少。当预制块厚度3 mm时,可发现大量规则的碳化物。硬度随之呈递增的变化规律。与此同时,耐磨性则呈先增加后下降的变化规律。当预制块厚度达到3 mm时,其相对耐磨性为基体的36倍,为所有试样中耐磨性最好的。The coating with high strength, high hardness and high wear resistance was prepared by laser cladding using high carbon ferrochrome, Fe-Si, WC, Fe-V, graphite and Fe as the major raw material. The microstructure and properties of the coating were investigated through OM, hardness tester and wet sand rubber wheel tester. The results show that with the increase of the thickness of alloyed powder, the content of M23C6 increases while the content of eutectic microstructure declines. When the thickness is 3 mm, a lot of regularly shaped carbides are found. The hardness of the coating increases while the wear resistance firstly increases then declines. When the thickness is 3 mm, the relative wear resistance is about 36 times than that of substrate, which is the best in all specimens.

关 键 词：汽车模具 激光熔覆 涂层 耐磨性 

分 类 号：TG422.1[金属学及工艺—焊接]