摘要
为了减少熔覆开裂,提高熔覆质量,本文采用一定光束间距的并联双光束激光对铸铁表面进行熔覆,建立熔覆过程三维热力耦合模型,分析双光束激光熔覆热/力特征变化。计算结果表明,双光束激光在提高熔覆效率的同时,相邻两熔道彼此进行预热与缓冷,减小了激光熔覆过程中急剧升温与冷却产生的巨大温度梯度,降低熔层和结合区的残余应力水平,进而达到抑制裂纹产生的效果。1 800W-1 400W功率组合、光束间距为12.5mm是较为理想的参数组合。
As for reducing cladding cracks and improving the quality,this paper uses dual-beam laser with specific beam spacing to clad on the gray cast iron surface.Three-dimensional thermo-mechanical coupling model in dual-beam laser cladding process is established.The thermal/mechanical characteristic is analyzed.The simulation shows that dual-beam laser can not only improve the cladding efficiency,but also decline the great temperature gradient in the laser process by pre-heating and cooling slowly between adjacent cladding channels.This could reduce the residual stress of cladding layer and bonding area,and then inhibits the crack initiation.The combination with power combination of 1 800W-1 400 Wand beam spacing of 12.5mm is the ideal parameter combination.
出处
《应用激光》
CSCD
北大核心
2014年第4期288-293,共6页
Applied Laser
基金
山东省高等学校科技计划资助项目(项目编号:J12LB76)
青岛市科技计划基础研究资助项目(项目编号:13-1-4-255-jch)
中央高校基本科研业务费专项资金资助项目(项目编号:14CX06125A)
关键词
双光束激光熔覆
热力耦合
温度场
应力场
dual-beam laser cladding
thermo-mechanical coupling
temperature field
stress field
