四种不同工艺条件下镍基自熔合金涂层试验研究  

Research on Ni-based Self-fluxing Alloy Coatings by Four Different Processes

作　　者：冯旭东[1] 袁庆龙[1] 曹晶晶[1] 苏志俊[1] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000

出　　处：《应用激光》2010年第2期100-104,共5页Applied Laser

摘　　要：采用热喷涂、火焰重熔、激光重熔、激光熔覆四种工艺方法,在Q235低碳钢上制备了Ni60涂层,研究了不同工艺条件下涂层的微观组织特征及硬度分布。结果表明,激光重熔涂层表面光滑、平整,表面粗糙度最小;四种工艺条件下得到涂层组织组成物基本相同,其主要包括γ-Ni同溶体、硼化物、碳化物+镍γ-固溶体共晶以及合金渗碳体等金属间化合物,热喷涂涂层组织中未形成共晶体;四种工艺条件下得到的涂层平均硬度均高于基体,均达到了表面强化的目的,其中,火焰重熔涂层的平均显微硬度最高,达到800HV,但是分布并不均匀。Microstructure and micro-hardness of Ni60 coatings obtained on the surface of Q235 steel by flame-spraying process, flame-remelting process, laser-remelting process, laser-cladding process were researched. The results show that the surface of the laser-remelted coating, whose surface roughness is least, is very smooth. The same constituents, which are mainly composed ofγ-Ni solid solution, boride, carbide＋γ-solid solution eutectic and intermetallic compounds such as cementite alloys, are observed in all of them. In addition, the eutectic isn’t formed in the thermal sprayed coating. The average micro-hardness of four coatings is all higher than that of the matrix. The four coatings all get the aim to strengthen the surface. The average micro-hardness of 800HV, which is higher than that of all others,belongs to the flame-remelted coating, but there isn’t evenly distributed.

关 键 词：火焰重熔 激光重熔 激光熔覆 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TN249[金属学及工艺—金属学]