摘要
采用数值模拟方法对激光熔覆成形钛合金过程中的温度场和应力场进行系统的仿真分析,对比中空环形热源和高斯热源两种典型光束特征下熔覆层与基材的温度场及应力场演变规律。结果表明,通过改变光束能量分布能有效调控熔池形貌和热应力分布;随着熔覆层数增加,两种热源条件下均会导致热积累效应显著,进而影响应力场分布特征;环形热源相较于高斯热源的层间温度分布更均匀,残余应力水平更低。
A systematic numerical simulation analysis was conducted to investigate the temperature field and stress field during laser cladding forming(LCF)of titanium alloy.The temperature field distribution and stress field evolution characteristics between the deposition layer and substrate were compared under two typical beam characteristics:hollow annular heat source and Gaussian heat source.Simulated results indicate that adjusting beam energy distribution can effectively regulate molten pool morphology and thermal stress distribution.Under both heat source conditions,the increasing number of cladding layers induces significant thermal accumulation effects,consequently influencing stress field distribution patterns.Compared with the Gaussian heat source,the annular heat source generates more interlayer temperature field distribution,thereby significantly reducing residual stress levels.
作者
杨媛
杨时铮
颜杰
吴强
李加强
YANG Yuan;YANG Shizheng;YAN Jie;WU Qiang;LI Jiaqiang(Mechanical Industry Key Laboratory of Electrical Machining Technology,Suzhou Electromachining Machine Tool Research Institute Co.,Ltd.,Suzhou 215011,China;School of Mechanical and Electric Engineering,Soochow University,Suzhou 215131,China)
出处
《电加工与模具》
北大核心
2025年第2期49-54,86,共7页
Electromachining & Mould
基金
中国博士后科学基金项目(2022M712651)。
关键词
激光熔覆成形
光束特征
热源模型
温度场
应力场
laser cladding forming
beam characteristics
heat source model
temperature field
stress field
