选区激光熔化成形Al-Si合金及其裂纹形成机制研究

王梦瑶; 朱海红; 祁婷; 张虎; 曾晓雁

doi:10.7510/jgjs.issn.1001-3806.2016.02.014

选区激光熔化成形Al-Si合金及其裂纹形成机制研究

1.
华中科技大学武汉光电国家实验室, 武汉 430074

作者简介: 王梦瑶(1990-),女,硕士研究生,现主要从事激光加工及激光快速成型的研究。.

通讯作者: 朱海红, zhuhh@mail.hust.edu.cn ;

基金项目:
国家自然科学基金资助项目(61475056);湖北省自然科学基金重点资助项目(2014CFA049);中央高校基本科研业务费资助项目(HUST:2013QT002)
中图分类号: TG665

Selective laser melting Al-Si aluminum alloy and the crack formation mechanism

1.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: ZHU Haihong, zhuhh@mail.hust.edu.cn ;

CLC number: TG665

摘要: 为了得到性能良好的Al-Si合金零件,对选区激光熔化成形Al-Si合金的成形特性以及成形试样中裂纹进行了研究,得到了成形样致密度和工艺参量的关系以及裂纹的形成机制。在合适的工艺区间内,随着激光能量密度的增大,致密度先上升后下降;大部分试样底部存在沿熔覆层扩展的冷裂纹;其形成机制是Al-Si合金粉末成形过程中,生成大量共晶Si相,使材料的抗裂性能不足以抵抗成形过程中的高温度梯度导致的残余应力所致。结果表明,通过调整成形工艺参量,可以得到无裂纹的性能良好的成型零件。
- 激光技术 /
- 选区激光熔化 /
- Al-Si合金 /
- 致密度 /
- 裂纹
Abstract: To get Al-Si alloy parts with high performance, the formation and cracking behaviors of Al-Si alloy parts fabricated by selective laser melting were studied. The relationship between process parameters and fabrication densification, and the mechanism of crack formation were revealed. The results show that the density of the fabricated samples increases at first and then decreases with the increase of laser power density. The cold cracks are formed in most of the samples which expand along the cladding layer. Its formation mechanism is that a large number of eutectic Si is formed during the process and eutectic Si reduces crack resistance strength of Al-Si aluminum alloy, and crack resistance cannot be enough to resist the high temperature gradient during the forming process, and the generated residual stress is the cause of cold cracks. By improving the process parameters, Al-Si alloy parts with high performance and without cracks could be formed.
- laser technique /
- selective laser melting /
- Al-Si alloy /
- densification /
- crack

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选区激光熔化成形Al-Si合金及其裂纹形成机制研究

作者简介: 王梦瑶(1990-),女,硕士研究生,现主要从事激光加工及激光快速成型的研究。.

通讯作者: 朱海红, zhuhh@mail.hust.edu.cn ;

Selective laser melting Al-Si aluminum alloy and the crack formation mechanism

Corresponding author: ZHU Haihong, zhuhh@mail.hust.edu.cn ;

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选区激光熔化成形Al-Si合金及其裂纹形成机制研究

通讯作者: 朱海红, zhuhh@mail.hust.edu.cn;

作者简介: 王梦瑶(1990-),女,硕士研究生,现主要从事激光加工及激光快速成型的研究。

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Selective laser melting Al-Si aluminum alloy and the crack formation mechanism

Corresponding author: ZHU Haihong, zhuhh@mail.hust.edu.cn

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选区激光熔化成形Al-Si合金及其裂纹形成机制研究

作者简介: 王梦瑶(1990-),女,硕士研究生,现主要从事激光加工及激光快速成型的研究。.

通讯作者: 朱海红, zhuhh@mail.hust.edu.cn ;

Selective laser melting Al-Si aluminum alloy and the crack formation mechanism

Corresponding author: ZHU Haihong, zhuhh@mail.hust.edu.cn ;

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选区激光熔化成形Al-Si合金及其裂纹形成机制研究

通讯作者: 朱海红, zhuhh@mail.hust.edu.cn;

作者简介: 王梦瑶(1990-),女,硕士研究生,现主要从事激光加工及激光快速成型的研究。

English Abstract

Selective laser melting Al-Si aluminum alloy and the crack formation mechanism

Corresponding author: ZHU Haihong, zhuhh@mail.hust.edu.cn

全文HTML

目录