铸铁表面双光束激光熔覆温度场与应力场分析  

Temperature and Stress Analysis of Dual-Beam Laser Cladding on Gray Cast Iron Surface

作　　者：刘衍聪[1,2] 范常峰[2] 尹晓丽[1] 杨光辉[2] 许鹏云[2] 

机构地区：[1]中国石油大学胜利学院,山东东营257097 [2]中国石油大学(华东),山东青岛266580

出　　处：《应用激光》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)

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.

关 键 词：双光束激光熔覆 热力耦合 温度场 应力场 

分 类 号：TG441.4[金属学及工艺—焊接]