Inconel718微环形零件激光增材制造残余应力数值分析

doi:10.3901/JME.2021.18.172

机械工程学报 ›› 2021, Vol. 57 ›› Issue (18): 172-181.doi: 10.3901/JME.2021.18.172

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Inconel718微环形零件激光增材制造残余应力数值分析

张嘉, 吴奇

北京工业大学材料与制造学部北京 100124

收稿日期:2020-11-04 修回日期:2021-03-20 出版日期:2021-09-20 发布日期:2021-11-30
通讯作者: 龙连春(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为超常环境下材料和结构的力学行为及多学科分析与优化。E-mail:longlc@bjut.edu.cn
作者简介:张嘉,男,1994年出生,博士研究生。主要研究方向为多学科分析与优化。E-mail:zh_jia_youxiang@163.com;吴奇,男,1990年出生,博士,讲师。主要研究方向为金属基复合材料微结构演化模拟,先进材料和结构关键力学问题及应用。E-mail:qiwu@bjut.edu.cn
基金资助:
科技部重大专项（2018YFB0703502）、北京市自然科学基金（3202001）、中国博士后科学基金（2018M641128）和北京市博士后科研活动经费（ZZ2019-129）资助项目。

Simulation of Residual Stress of SLM Additive Manufactured Micro-annular Inconel718 Components

ZHANG Jia, LONG Lianchun, WU Qi

Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124

Received:2020-11-04 Revised:2021-03-20 Online:2021-09-20 Published:2021-11-30

摘要/Abstract

摘要： 选区激光熔化技术由于产生局部高温，材料发生不均匀变形，残余应力极大影响成形件质量。含空腔微型环形零件为数值模型研究对象，运用热弹塑性材料模型、金属粉末-固体两相转化及生死单元重启动技术，建立选区激光熔化过程热-力顺序耦合数值仿真模型，研究选区激光熔化增材中，零件残余应力分布规律及尺寸效应。计算结果与文献试验值对比验证有效性。研究结果表明，选区激光熔化加工微型环形零件，残余应力随着零件的曲率减小而增大，且压缩残余应力主要分布在零件的内、外壁，而拉伸残余应力主要分布在零件中径附近。残余应力随着增材高度的增加先减小后增大，并逐渐趋于稳定。

关键词: 激光选区熔化, 增材制造, 残余应力, Inconel718, 数值模拟

Abstract: During selective laser melting additive manufacture, due to local high temperature, the material undergoes non-uniform deformation and produces residual stress, which greatly affects the processing quality of the parts. A numerical model of selective laser melting process is established by means of thermo-mechanical sequential coupling, thermo-elastic-plastic model, metal powder-solid two-phase transformation, birth-death element and restart technology. Then the influence of geometric configuration on residual stress is studied. Compared with experimental results in literatures, the accuracy of the simulation algorithm is verified. The results show that the residual stress increases with the decrease of curvature of the parts, and the compressive residual stress mainly distributes on the inner and outer walls of the parts, while the tensile residual stress mainly distributes on the area near the middle diameter of the parts. With the increase of the height of the additive, the residual stress decreases first and then increases, and gradually tends to be stable.

Key words: selective laser melting, additive manufacturing, residual stress, Inconel718, numerical simulation

中图分类号:

TH164

张嘉, 吴奇. Inconel718微环形零件激光增材制造残余应力数值分析[J]. 机械工程学报, 2021, 57(18): 172-181.

ZHANG Jia, LONG Lianchun, WU Qi. Simulation of Residual Stress of SLM Additive Manufactured Micro-annular Inconel718 Components[J]. Journal of Mechanical Engineering, 2021, 57(18): 172-181.

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Inconel718微环形零件激光增材制造残余应力数值分析

Simulation of Residual Stress of SLM Additive Manufactured Micro-annular Inconel718 Components

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