激光熔覆热影响区及残余应力分布特性研究  

Study of Thermal-Mechanical Coupling Behavior in Laser Cladding

作　　者：华亮[1,2] 田威[2] 廖文和[2] 曾超[2] 

机构地区：[1]南京铁道职业技术学院动力工程学院,江苏南京210031 [2]南京航空航天大学机电学院,江苏南京210016

出　　处：《激光与光电子学进展》2014年第9期128-134,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51105205);中央高校基本科研业务费专项科研项目(NS2012051)

摘　　要：采用三维有限元分析方法对16MnR钢激光熔覆Ni-Cr-B-Si合金粉末过程进行了仿真分析,得到了不同激光熔覆参数(激光功率、扫描速度、光斑直径)下的温度场及残余应力分布。采用两种方法来判断最优的激光熔覆工艺参数:1)利用正交试验的直观分析法对基体材料热影响区深度进行进一步分析以获得最优参数;2)利用最大残余拉应力和材料断裂强度的比值来选择最优参数。两种方法得到的最优激光熔覆参数相同。A three dimensional finite element model is employed to simulate the cladding process of Ni-Cr-B- Si coatings on 16MnR steel under different parameters including laser power, scanning speed and spot diameter. The temperature and residual stress distribution, the depth of the heat affected zone （HAZ） and the optimized parameters for laser cladding remanufacturing technology are obtained. The orthogonal experiment and intuitive analysis on the depth of the HAZ are performed to study the influence of different cladding parameters. A new criterion based on the ratio of the maximum tensile residual stress and fracture strength of the substrate is proposed for optimization of the remanufacturing parameters. The results show well agreement with that of the HAZ analysis.

关 键 词：激光技术 有限元 激光熔覆 温度场 残余应力分布 热力耦合 

分 类 号：TG156.2[金属学及工艺—热处理]