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
任闻杰 1杨上陆 1孙军浩 2陈双建 1李铸国2
作者信息
- 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
- 折叠
摘要
采用有限元计算方法对高温合金Inconel 617光纤激光焊和CO2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1 280 ℃,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CO2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CO2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.
Abstract
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 CO2 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 rota-tional 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 CO2 laser welding for superalloy Inconel 617.The first principal strain of HAZ for fiber laser welding is increased gradually,while the first prin-cipal strain near the HAZ neck shrinkage in CO2 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Key words
superalloy/laser welding/stress and strain/liquation cracks sensitive strain rate/liquation cracks引用本文复制引用
基金项目
国家自然科学基金(51905343)
国家自然科学基金(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)
出版年
2024
NETL
NSTL
万方数据