9SiCr工具钢表面激光熔覆合金的组织与性能

Microstructure and Properties of Laser Cladding Alloys on Surface of 9SiCr Tool Steel

使用CO2 激光器对 9SiCr工具钢表面进行Co基和Ni基合金熔覆处理 ,X射线衍射仪、扫描电子显微镜分析了激光合金熔覆层的相组成和显微组织 ;显微硬度计对合金熔覆区的显微硬度进行测量·结果表明 ,合金熔覆层在微观结构上存在熔覆区、结合区和基体热影响 3个区域·Co基合金熔覆区相组成为奥氏体 +铁素体 +碳化物 ,Ni基合金熔覆区相组成为奥氏体 +铁素体 +碳化物 +金属间化合物·Ni基合金熔覆层的显微硬度约为Co基的

Using a 5?kW CO 2 laser,Co and Ni alloy coating on 9SiCr tool steel surface was remelted as cladding layer.The phase compositions and microstructure of laser alloy cladding zone were investigated using X ray diffraction and scanning electron microscope. The microhardness distributions of laser alloy cladding zone were measured using microhardness tester. The laser cladding layer is divided into the clad,binding and the heating affected zone. The phase compositions are austenite,ferrite and carbides in Co alloy cladding zone and austenite,ferrite,carbides and intermetallitic compound in Ni alloy cladding zones. Microhardness of Ni alloy cladding zones surface is about two times that of Co alloy cladding zones surface.