(哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院，哈爾濱 150001； *北京理工大學(xué))
摘 要: 運用SEM，TEM及XRD研究了優(yōu)化工藝條件下獲得的激光熔覆F102Ni-Cr- B-Si-C合金粉末涂層的微觀組織。結(jié)果表明，涂層區(qū)組織為初生鉻硼化合物+Ni基胞枝狀固溶體+Ni枝晶間析出的碳化物、硼化物和Ni+Ni3B或Ni+M23C6；結(jié)合區(qū)組織以Ni+Ni3B為主及碳化物和碳硼化物構(gòu)成的偽多元共晶胞狀晶。摩擦磨損試驗表明，激光涂層的摩擦系數(shù)(0.21～0.3)比鋼基底(0.65～0.8)低得多， 磨損速率約低一個數(shù)量級。
關(guān)鍵字: 激光熔覆 Ni基合金 微觀組織 摩擦磨損
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001;
* Beijing Institute of Technology, P. R. China）
Abstract:Microstructures and friction and wear properties of laser-clad Ni-Cr-B-Si-C alloy on steel AISI1045 were investigated with SEM, TEM, XRD and a pin-ring friction and wear testing machine. The coating obtained under optimal process condition posseses two distinct zones, i.e. clad layer(CL) and bonding zone (BZ). The friction coefficient of the coating (0.2～0.3 ) is much lower than that of the substrate(0.65～0.8). The wear rate of the clad is approximately an order lower than that of the substrate.
Key words: laser cladding Ni-based alloy microstructure friction and wear
