激光熔覆Ni60合金涂层裂纹控制研究  

Research on Crack Regulation of Laser⁃cladding Ni60 Alloy Coatings

作　　者：叶俊洋 李先芬[1] 沈虎 徐政 YE Junyang;LI Xianfen;SHEN Hu;XU Zheng(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《焊管》2023年第12期28-33,共6页Welded Pipe and Tube

基　　金：合肥工业大学2022年省级大学生创新创业训练计划“激光熔覆SiC-MoS2-Ni基自润滑涂层组织及摩擦学改性探究”(项目编号202210359045)。

摘　　要：为了减少激光熔覆层中裂纹的产生,采用激光熔覆技术在42CrMo钢表面制备Ni60熔覆层,通过对熔覆层显微组织、物相以及能谱分析来探究裂纹形成机理,同时还研究了不同激光功率和预热温度对裂纹的影响。研究表明,熔覆层主要由γ-(Fe,Ni)、Fe_(0.64)Ni_(0.36)和M_(23)C_(6)组成,基体与熔覆层之间的热物理性质、温度梯度以及熔覆层的硬质相分布等都会对裂纹数量和长度产生影响;随着激光功率和预热温度的提高,熔覆层中裂纹的数量和长度均有一定改善。研究结果可为激光熔覆Ni基合金裂纹控制提供参考依据。In order to reduce the generation of cracks in the laser cladding layer,a Ni60 cladding layer was prepared on the surface of 42CrMo steel using laser cladding technology.The mechanism of crack formation was explored by analyzing the microstructure,phase,and energy spectrum of the cladding layer,and the effects of different laser power and preheating temperature on the crack were also investigated.The study shows that the cladding layer mainly consists ofγ-(Fe,Ni),Fe_(0.64)Ni_(0.36)and M_(23)C_(6).The thermophysical properties,the temperature gradient and the distribution of hard phase in the cladding layer between the matrix and the cladding layer all affect the number and length of cracks.With the increase of laser power and preheating temperature,the number and length of cracks in the cladding layer have improved to some extent.The research results can provide a reference basis for crack control in laser cladding Ni based alloys.

关 键 词：激光熔覆 NI基合金 裂纹 激光功率 预热 

分 类 号：TG174.44[金属学及工艺—金属表面处理]