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2Cr13马氏体不锈钢表面经激光熔覆Ni基及Ni+Cr3C2合金后,凝固组织呈现多相混合特征。Ni基合金涂层的凝固组织中观察到三种以γ-Ni为领先相的共晶区;Cr3C2粒子的加入及大部分的溶解,提高了激光熔池中的Cr、C含量,导致较多的碳铬和硼铬化合物的形成。不仅改变了Ni基合金涂层的微观组织结构,而且也改变了涂层合金的凝固过程。结合XRD,SEM和TEM技术分析了两种激光涂层的凝固组织特征及凝固过程。
The surface of 2Cr13 martensitic stainless steel after laser cladding Ni-based and Ni + Cr3C2 alloy, the solidified microstructure showed heterogeneous mixing characteristics. Three Ni-based eutectic phases were observed in the solidified microstructure of the Ni-based alloy coating. The addition of Cr3C2 particles and the majority of the dissolution of the Cr3C2 particles increased Cr and C contents in the laser pool, leading to more The formation of carbon chromium and borochromium compounds. Not only changed the microstructure of Ni-based alloy coating, but also changed the coating alloy solidification process. The characteristics of the solidification microstructure and the solidification process of the two laser coatings were analyzed by XRD, SEM and TEM.