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本文进行了45钢激光铬合金化研究。通过对硬度、成分、残余应力及相组织的定量测量,结合形貌观察和工艺参数,对合金层进行了综合分析。结果表明,45钢激光铬合金化强化机理主要是马氏体相变强化;由于马氏体相变,合金层内存在残余压应力;由于合金层内C、Cr分布均匀,抑制了奥氏体的转变,从而使合金层内残存亚稳态的奥氏体相;熔化深度也影响奥氏体的转变,对含铬量低(～11Cr%)的合金层,当熔化深度很深(780μm)或熔化层深且相互搭叠时,残余奥氏体量减少。
In this paper, 45 steel laser chrome alloy research. Based on the quantitative measurement of hardness, composition, residual stress and microstructure, combined with morphology observation and process parameters, the alloy layer was comprehensively analyzed. The results show that the strengthening mechanism of laser chrome alloying is mainly martensitic transformation strengthening; the residual compressive stress exists in the alloy layer due to the martensitic transformation; the uniform distribution of C and Cr in the alloy layer inhibits the austenite , So that the metastable austenite phase remains in the alloy layer. The melting depth also affects the austenite transformation. For the alloy layer with low Cr content (~ 11Cr%), when the melting depth is deep (780μm) Or the molten layer is deep and overlapping with each other, the amount of retained austenite decreases.