摘要
采用有限元法对H13钢基体表面激光熔覆Stellite6钴基粉末的温度场进行了数值模拟。分析了不同功率、扫描速率和光斑半径对单道激光熔覆温度场分布的影响,得出了最佳工艺参数为:激光功率1200 W,扫描速率200 mm/min,光斑半径2 mm。模拟了多道搭接温度场分布,获得了温度梯度以及熔池边缘的冷却速率。结果表明:多道搭接时,前一道对后一道有着明显的预热作用;垂直于扫描方向的温度梯度最大。采用优化的工艺参数进行了激光熔覆钴基合金实验研究,获得了组织细小、致密且无缺陷的熔覆层。数值模拟结果与实验结果吻合较好。
Numerical simulation of the laser cladding temperature field of Stellite6 cobalt-based powder on the surface of H13 steel was simulated with finite element method.Influence of different laser power,scanning speed and radius of the laser beam spot on the distribution of the temperature field were analyzed,and the optimum process parameters were obtained:the laser power is 1200 W,scanning speed is 200 mm/min and the laser spot radius is 2 mm.After the temperature distribution of multi-track overlapping laser cladding was simulated,the temperature gradient and cooling rate at the edge of molten pool were obtained.The results show that in multi-track overlapping laser cladding,the former track has an obvious preheating effect on the latter one.The temperature gradient perpendicular to the scanning direction is the largest,which will influence the growing status of the microstructure.Laser cladding experiment of cobalt-based alloy has been carried out with the optimized parameters,and cladding layer with fine and compact microstructure without defects has been obtained.The simulated results is well coincided with the experimental results.
作者
李海洋
宋建丽
唐彬
石晓蕾
邱焕霞
邓琦林
Li Haiyang;Song Jianli;Tang Bin;Shi Xiaolei;Qiu Huanxia;Deng Qilin(School of Instrument Science and Opto Electronics Engineering,Information Science and Technology University,Beijing100192,China;Shandong Provincial Key Lab of Special Welding Technology,Weihai,Shandong 264209,China;Shanghai Electric Power Co.,Ltd.,Wujing Thermal Power Plant,Shanghai 200241,China;School of Mechanical Engineering,Shanghai Jiaotong University,Shanghai 200240,China)
出处
《应用激光》
CSCD
北大核心
2020年第4期571-578,共8页
Applied Laser
基金
国家自然科学基金项目(项目编号:51775050)
关键词
激光熔覆
数值模拟
温度场
温度梯度
冷却速率
laser cladding
numerical simulation
temperature field
temperature gradient
cooling rate