激光立体成形TC4热-变形行为数值分析

鹿旭飞; 马良; 林鑫; 郑宇翔

doi:10.13433/j.cnki.1003-8728.20190291

激光立体成形TC4热-变形行为数值分析

doi: 10.13433/j.cnki.1003-8728.20190291

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

基金项目:

国家重点研发计划项目 2016YFB1100602

国家重点研发计划项目 2016YFB1100104

详细信息

作者简介:
鹿旭飞(1994-), 博士研究生, 研究方向为增材制造热应力仿真, luxufei@mail.nwpu.edu.cn

通讯作者:
马良, 高级工程师, 博士, maliang@nwpu.edu.cn

中图分类号: TG146
计量
- 文章访问数: 140
- HTML全文浏览量: 30
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2019-05-30
- 刊出日期: 2020-09-01

Numerical Analysis of Thermal Distortion Behavior for Laser Solid Formed TC4 Alloy

Lu Xufei^{1, 2
,},
Ma Liang^{1, 2
, ,},
Lin Xin^{1, 2},
Zheng Yuxiang^{1, 2}

1.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
2.
MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi'an 710072, China

摘要

摘要: 本文针对激光立体成形过程中的热应力变形问题，首先利用原位测量平台监测了一次沉积和二次沉积单壁墙过程中的温度场和基板变形历史，然后基于测量结果校验了有限元热力耦合模型，最后分析了激光立体成形过程中热-变形的演化规律。结果表明，模拟结果与实验结果相符。随着沉积层数增加高温区面积不断增加，且熔池前沿温度梯度明显大于熔池尾部。相比一次沉积过程，二次沉积过程中熔池温度明显较高，且升温速率更快。另外，初始沉积阶段的高温度梯度和冷却阶段的高冷速是诱导热应力和变形的主要因素。
- 激光立体成形 /
- 温度场 /
- 变形 /
- TC4合金 /
- 数值分析
Abstract: In order to regulate the thermal stress and distortion in the laser solid forming (LSF) process, in-situ measurement platform is firstly used to monitor the temperature field and substrate distortion in LSF primary deposition and secondary deposition of single-wall. Then the finite element thermo-mechanical coupling model is verified by using the measurement results. Finally, a detailed analysis of the thermal and distortion evolution in LSF process is carried out. The results show that the simulation results are in a good agreement with the experimental. As the deposition layer increases, the area of the high temperature zone increases continuously and the temperature gradient at the front of the molten pool is significantly larger than that at the tail. Comparing with the primary deposition process, the molten pool temperature and the heating rate are significantly higher in the secondary deposition process. In addition, the high temperature gradient in the initial deposition phase and the high cooling rate in final cooling phase result in larger stress and distortion.
- laser solid forming /
- temperature field /
- distortion /
- TC4 alloy /
- numerical analysis

HTML全文

图 1 LSF原位测量实验

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图 2 热电偶和位移传感器监测位置及试样尺寸

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图 3 单壁墙有限元模型

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图 4 一次沉积过程中的温度场分布

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图 5 一次沉积过程中基板温度计算结果与实验对比

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图 6 一次沉积过程计算的熔池温度与实验对比

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图 7 一次沉积基板变形计算结果与实验对比

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图 8 二次沉积过程中温度场演化

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图 9 二次沉积过程中基板D、E两点温度模拟曲线

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图 10 熔池温度演化

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图 11 二次沉积过程中基板DS点的翘曲变形历史

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表 1 LSF工艺参数

试样	光斑直径/mm	激光功率/W	扫描速度/(mm·s^-1)	抬升量/mm
1	3	1 500	10	0.15
2	3	2 000	8	0.15

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参考文献(15)

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