镍基高温合金激光焊液化裂纹倾向性数值模拟研究  

Numerical Simulation of Liquation Cracks Tendency During Laser Welding of Nickel-Based Superalloy

作　　者：任闻杰 杨上陆 孙军浩[2] 陈双建 李铸国[2] Ren Wenjie;Yang Shanglu;Sun Junhao;Chen Shuangjian;Li Zhuguo(Research and Development Center of Laser Intelligent Manufacturing Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中国科学院上海光学精密机械研究所,激光智能制造技术研发中心,上海201800 [2]上海交通大学,上海市激光制造与材料改性重点实验室,上海200240

出　　处：《应用激光》2024年第7期85-94,共10页Applied Laser

基　　金：国家自然科学基金(51905343,52005492);中国博士后科学基金面上项目(2019M651461);浙江省“尖兵”“领雁”研发攻关计划(2022C01026);上海前瞻创新研究院项目(22xtcx00500)。

摘　　要：采用有限元计算方法对高温合金Inconel 617光纤激光焊和CO_(2)激光焊接热循环规律、热应力应变演变规律及其力学机制进行研究。结果表明,旋转体热源-旋转对数体热源-3D高斯热源模型构建的高温合金Inconel 617激光焊接热源模型准确性较好,热影响区的颈缩处冷却速率最低。当热影响区温度加热高于约1280℃,晶界和晶内开始发生组分液化。高温合金Inconel 617光纤激光焊和CO_(2)激光焊的Von miss应力均无大幅度的下降;光纤激光焊HAZ的第一主应变逐渐增加,而CO_(2)激光焊HAZ颈缩处附近的第一主应变增加明显。随着激光焊接热输入降低,HAZ液化裂纹敏感性应变速率逐渐增加。相对于激光焊接HAZ的von Mises应力和第一主应变,液化裂纹敏感性应变速率更适合解释Inconel 617高温合金激光焊接液化裂纹形成的主要因素。In this paper,the finite element method was used to study the thermal cycle,the evolution law of thermal stress-strain and the mechanical mechanism of the fiber laser welding and CO_(2)laser welded superalloy Inconel 617.The results show that the accuracy of the heat source model for laser welded superalloy Inconel 617 with the rotating body heat source,the rotational body heat source rotational logarithmic body heat source and 3D gauss heat source is good.The cooling rate at the neck shrinkage of the HAZ is the lowest.When heating above 1280℃in the HAZ,constitutional liquation was found inside the grain and at grain boundaries.There was no significant decrease in Von Miss stress of fiber laser welding and CO_(2)laser welding for superalloy Inconel 617.The first principal strain of HAZ for fiber laser welding is increased gradually,while the first principal strain near the HAZ neck shrinkage in CO_(2)laser welding is increased significantly.With the decrease of laser welding heat input,the sensitive strain rate of HAZ liquation cracking gradually increased.Compared with the Von-mises stress and the first principal strain of laser welding in HAZ,the liquation cracking sensitive strain rate is more suitable to explain the main factors for the formation of liquation cracking in laser welding of superalloy Inconel 617.

关 键 词：高温合金 激光焊接 应力应变 液化裂纹敏感性应变速率 液化裂纹 

分 类 号：TG456.7[金属学及工艺—焊接]