考虑固态相变的激光熔覆成形应力场有限元分析  

Study of Stresses of Laser Metal Deposition Using FEM Considering Phase Transformation Effects

作　　者：方金祥[1,2] 董世运[2] 徐滨士[2] 王玉江[2] 何鹏[1] 夏丹[2] 张智慧[1,2] 任维彬[2] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]装甲兵工程学院再制造国防科技重点实验室,北京100072

出　　处：《中国激光》2015年第5期131-138,共8页Chinese Journal of Lasers

基　　金：国家973计划(2011CB013403)

摘　　要：为了研究固态相变对马氏体钢激光熔覆成形过程应力演化的影响,建立了考虑降温过程马氏体相变的热-力耦合激光单道熔覆及多层多道堆积有限元模型。在实测材料物性参数的基础上,对单道熔覆及多层多道堆积应力演化进行了有限元分析。分析结果表明,马氏体相变对应力场演化影响显著,同只考虑热-力耦合的模型计算结果相比,考虑固态相变的情况下,有限元结果同实验值比较吻合,残余应力水平显著降低,且分布规律明显不同。To investigate the influences of solid state phase transformation on stress evolution during laser matal powder deposition, a 3D finite-element thermo-mechanical model considering phase transformation effects is established. The stress fields during single layer and multiple layer laser metal deposition process are analyzed. Stress measurement of blind hole method is applied to cladded samples. The results are compared with the computational predictions, which should be a validation for the predictions with the inclusion of transformation kinetics. The importance of considering phase transformation effects is verified through the comparison of the magnitudes of residual stresses with and without the inclusion of transformation kinetics.

关 键 词：激光技术 熔覆成形 残余应力 有限元分析 马氏体相变 

分 类 号：TN249[电子电信—物理电子学]