宽带激光熔凝过程温度场及残余应力数值分析  

Numerical Analysis of Transient Temperature Field and Stress Distribution in Laser Wide-band Melting Process

作　　者：高光启 王勇[2] 占焕校[2] 赫庆坤[2] 

机构地区：[1]山东矿机集团,山东潍坊262400 [2]中国石油大学(华东)机电工程学院,山东东营257061

出　　处：《中国表面工程》2008年第2期15-19,25,共6页China Surface Engineering

基　　金：山东省自然科学基金资助项目(Y2006F64);中国石油大学研究生创新基金资助项目(S2007-5)

摘　　要：基于激光宽带熔凝强韧化处理过程,利用有限元软件SYSWELD建立三维有限单元模型,通过设定精确的边界计算条件,同时考虑材料组织与性能随温度的变化,模拟工件表面的温度场和残余应力。考虑了相变潜热、导热系数等材料热物性参数随温度变化等因素的影响,研究激光宽带熔凝加工瞬态温度场和热应力的分布规律。对计算结果进行分析,并与实验数据相比较。结果表明,通过瞬态温度场分布,能够逼真地反映温度变化规律;宽带激光熔凝后,在工件表面获得了有利的残余压应力分布,热影响区存在应力突变。Based on the process of laser wide-band melting processing, the transient numerical simulation of temperature fields and thermal stresses were studied with the 3-D finite element model in software-SYSWELD, the thermal calculation was given by the precise thermal conductive equation. The distribution relations of transient temperature fields and thermal-stresses were analyzed in consideration of the effects of phase transformation latent heat, thermal conductivity coefficient and thermal- mechanical parameters. A good conformity was displayed demonstrated with experimental data. The results showed that, the regularity for kinetic variation of temperature in laser wide band melting process could be obtained. There were a favorable compression stress area in the melting area and an abrupt change of the stress value occurred in the heat affected zone on the surface of working piece.

关 键 词：激光宽带熔凝 温度场 残余应力 有限单元法 

分 类 号：TG156[金属学及工艺—热处理] TG111.3[金属学及工艺—金属学]