激光立体成形TC4钛合金的热力场演化

中国机械工程

激光立体成形TC4钛合金的热力场演化

鹿旭飞1,2;马良1,2;林鑫1,2;郑宇翔1,2

1.西北工业大学凝固技术国家重点实验室，西安，710072
2.西北工业大学金属高性能增材制造与创新设计工业和信息化部重点实验室，西安，710072

出版日期:2020-05-25 发布日期:2020-06-28
基金资助:
国家重点研发计划资助项目（2016YFB1100602,2016YFB1100104）

Thermo-stress Field Evolution of TC4 Titanium Alloy by LSF

LU Xufei1,2;MA Liang1,2;LIN Xin1,2;ZHENG Yuxiang1,2

1.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072
2.Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design,Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi’an, 710072

Online:2020-05-25 Published:2020-06-28

摘要/Abstract

摘要： 激光立体成形能够实现高性能复杂零件的精确成形，但成形过程中的高温度梯度极易导致残余应力和变形，最终影响构件的几何精度和力学性能。通过搭建基板单边夹持原位热变形测量系统，探究了多道多层TC4钛合金成形件在激光立体成形过程中基板温度、变形的演化规律，分析了不同扫描策略对构件热应力场的影响。研究结果表明，构件的变形发展受其热历史驱使，扫描策略对成形件的热变形具有显著影响。

关键词: 激光立体成形, 扫描策略, 热应力场, TC4钛合金

Abstract: LSF might achieve accurate forming of high-performance complex parts, while large thermal gradients in LSF processes provoked residual stress and distortion, and affected the geometrical accuracy and mechanics properties of fabricated parts. A situ measurement system of thermal and distortion for single side clamping of substrate was built, and the—temperature and distortion evolution of plate of multi-channel multi-layer TC4 titanium alloy parts was investigated. Influences of different scanning strategies on thermo-stress field of parts were analyzed. The research results show that the development of substrate distortion is propelled by corresponding thermal history, and the scanning strategies significantly affect the thermal distortion of LSF parts.

Key words: laser solid forming(LSF), scanning strategy, thermo-stress field, TC4 titanium alloy

中图分类号:

TG156

鹿旭飞1,2;马良1,2;林鑫1,2;郑宇翔1,2. 激光立体成形TC4钛合金的热力场演化[J]. 中国机械工程.

LU Xufei1,2;MA Liang1,2;LIN Xin1,2;ZHENG Yuxiang1,2. Thermo-stress Field Evolution of TC4 Titanium Alloy by LSF[J]. China Mechanical Engineering.

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