NAK80模具钢表面激光熔覆Ni基碳化钨合金涂层的组织和性能  

Microstructure and Properties of Laser Cladding Ni-based Tungsten Carbide Alloy Coating on NAK80 Mold Steel

作　　者：程虎[1] 方志刚[1] 赵先锐[1] 戴晟[1] 高玉新[1] 

机构地区：[1]台州学院,台州318000

出　　处：《表面技术》2011年第1期5-7,共3页Surface Technology

基　　金：浙江省分析测试科技计划项目(2009F70048)

摘　　要：采用激光熔覆技术,在NAK80模具钢表面制备了Ni基碳化钨合金涂层。研究了激光熔覆涂层的组织结构特点及形成规律,测试分析了其显微硬度的分布特征。结果表明:涂层与基体之间呈良好冶金结合,熔覆层组织主要由树枝晶Cr23C6、未熔碳化钨颗粒相、-γNi固溶体及少量分布于固溶体中的NiCr和CrB2相组成;涂层的硬度远高于NAK80模具钢基体,从一定程度上改善了模具表面的耐磨性能。The Ni-based tungsten carbide alloy coating was fabricated on NAK80 mold steel by laser cladding technology.The characteristic of microstructure,micro-hardness and the formation mechanics were examined.The results show that the metallurgical bonding is good between the cladding coating and the steel substrate,the microstructure of laser cladding coating is composed of fir-tree crystal Cr23C6,un-melted tungsten carbide granular crystal,γ-Ni solid solution and NiCr,CrB2.The micro-hardness of laser cladding coating is considerably higher than the substrate,so the wear-resisting property of mold surface is improved to some extent.

关 键 词：NAK80模具钢 激光熔覆 Ni基碳化钨合金 组织 性能 

分 类 号：TG174.45[金属学及工艺—金属表面处理]