热等静压扩散焊制备耐磨层的组织与性能

Microstructure and properties of wear resistant layer by HIP diffusion bonding

采用热等静压粉-固连接工艺,研究了0Cr18Ni10Ti合金与Stellite6钴基粉末经热等静压扩散连接及热处理后,耐磨层的组织、力学性能及界面区元素扩散情况。结果表明,热等静压制备的耐磨层组织均匀,主要由Co、Cr3C2、Cr23C6和CrSi2等相组成;界面处W、Fe、Co、Ni和Cr等元素相互扩散,扩散区宽度为40μm,形成了良好的冶金结合,其结合强度约为500 MPa;耐磨层硬度达到55 HRC以上。钴基耐磨层具有良好的耐磨性,热处理后,耐磨层材料的硬度及强度有所提高,XRD分析显示有CoWSi、CrSi2和Co6W6C相析出有利于提高材料的硬度。

OCr18Nil0Ti stainless steel and powder Stellite6 were joined by HIP solid-powder diffusive bonding. The microstructure and properties of the wear-resistant layer, bonded interface and the inter diffusion of the components in the diffusive zone were studied. The results indicate that wear-resistant layers with homogeneous microstructure are mainly composed of Co, Cr3C2 , Cr23C6 and CrSi2. Moreover, it has good abrasive resistance and 55 HRC hardness. A good metallurgical bonded interface zone is of 40 μm width and 500 MPa bonding strength. The inter diffusion of W, Fe, Co, Ni and Cr elements is evident. The strength and hardness increase after heat treating. XRD results indicate that there is precipitation of CoWSi, CrSi2 and Co6W6C phases which can improve hardness.