等离子熔覆镍铬碳合金层的显微组织和硬度
Materials for Mechanical Engineering(2011)
Abstract
采用等离子熔覆技术在挖泥船耙齿材料低碳马氏体铸钢表面制备了镍铬碳合金层,借助OM、SEM、EDS、XRD和显微硬度计等对熔覆层的显微组织、化学成分和显微硬度等进行了分析。结果表明:熔覆层与基体形成了冶金结合,主要由-γFe+(Cr,Fe)7C3共晶相和初生板条或块状硬质耐磨相(Cr,Fe)7C3组成;当熔覆电流为100 A、扫描速度为150 mm.min-1时,熔覆层的组织最致密,显微硬度高达1 053 HV。
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Key words
plasma cladding,Ni-Cr-C alloy coating,scoop tooth,hardness
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