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采用CO2 连续波工业激光器在Cr1 2钢表面进行了激光处理试验 ,利用光学显微镜、电子显微镜观察了激光熔凝处理后Cr1 2钢的组织 ,并比较了激光处理前后的耐磨性。结果表明 ,激光熔凝后获得超细化的枝晶组织 ,其组织为树枝状初晶A′和树枝间层片状共晶 (A′ +(Cr、Fe) 7C3 )。组织细化 ,奥氏体应力应变诱发马氏体转变 ,磨损中大量位错团的产生是激光处理后Cr1 2钢耐磨性提高的原因。
The CO2 continuous wave industrial laser was used to test the surface of Cr1 2 steel. The microstructures of Cr1 2 steel after laser cladding were observed by optical microscope and electron microscope. The wear resistance of the Cr1 2 steel was compared. The results show that ultrafine dendritic microstructure obtained after laser melting is composed of dendrite A ’and dendritic eutectic (A’ + (Cr, Fe) 7C3). Microstructure refinement, austenite stress-strain induced martensitic transformation, the generation of a large number of dislocation clusters in wear is the reason why the wear resistance of Cr1 2 steel after laser treatment is improved.