AlSi10Mg的激光选区熔化成形研究

doi:10.11900/0412.1961.2016.00472

金属学报

2017, Vol. 53

Issue (8): 918-926 DOI: 10.11900/0412.1961.2016.00472

本期目录 | 过刊浏览

AlSi10Mg的激光选区熔化成形研究

张文奇, 朱海红(

), 胡志恒, 曾晓雁

华中科技大学武汉光电国家实验室武汉 430074

Study on the Selective Laser Melting of AlSi10Mg

Wenqi ZHANG, Haihong ZHU(

), Zhiheng HU, Xiaoyan ZENG

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

引用本文:

张文奇, 朱海红, 胡志恒, 曾晓雁. AlSi10Mg的激光选区熔化成形研究[J]. 金属学报, 2017, 53(8): 918-926.
Wenqi ZHANG, Haihong ZHU, Zhiheng HU, Xiaoyan ZENG. Study on the Selective Laser Melting of AlSi10Mg[J]. Acta Metall Sin, 2017, 53(8): 918-926.

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摘要:

利用激光选区熔化(selective laser melting, SLM)成形技术对AlSi10Mg铸造铝合金的成形进行了工艺研究,获得了致密的成形,并对其沉积态和热处理态试样进行了静态拉伸性能测试和显微组织分析。结果表明：对于AlSi10Mg, 其SLM沉积态的常温拉伸强度远高于铸件标准,延伸率与铸态相当;退火工艺对SLM试样的组织及力学性能有着重要的影响,随着退火温度的提高,试样微观组织发生改变,在300 ℃、2 h退火工艺下,原本均匀分布的颗粒状Si聚集长大为针状,使得试样的强度下降,延伸率升高。抗拉强度由沉积态的507~518 MPa下降到378~406 MPa,延伸率由沉积态的3.0%~3.5%增加到6.5%~9.0%。

关键词 ： AlSi10Mg, 激光选区熔化, 力学性能, 热处理

Abstract：

The growing interest for a wide range of usable Al alloy parts with complex shape in industrial field makes selective laser melting (SLM) stand out as a new technology for rapid prototyping manufacturing. The objective of this work is to investigate AlSi10Mg cast aluminum alloy manufacturing by SLM. The investigation involved the influence of process parameters on the relative density and the influence of heat treatment on the microstructure and mechanical properties. High density and performance were achieved. The results show that the tensile strength of the SLMed AlSi10Mg is much higher than that of press wrought AlSi10Mg, but the elongation is as almost same as that of the press wrought AlSi10Mg. The heat treatment has a significant effect on the mechanical properties and microstructure of SLMed AlSi10Mg parts. The mechanical properties changes with the annealing temperature. Compared with the mechanical properties without annealing process, the tensile strength decreases from 507~518 MPa to 378~406 MPa and the elongation increases from 3.0%~3.5% to 6.5%~9.0% when the annealing temperature is 300 ℃ and the soap time is 2 h because of the changes in the morphology and distribution of the Si.

Key words： AlSi10Mg selective laser melting mechanical property heat treatment

收稿日期: 2016-10-24

ZTFLH:

TG665

基金资助:国家自然科学基金项目No.61475056, 中央高校基本科研业务费专项资金项目No.2016XYZD00, 湖北省自然科学基金重点项目No.2014CFA049, 以及武汉光电国家实验室主任基金项目

作者简介:

作者简介张文奇,男,1991年生,硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00472 或 https://www.ams.org.cn/CN/Y2017/V53/I8/918

图1 实验装置示意图

图2 扫描速度对激光选区熔化(SLM)成形AlSi10Mg试样的相对密度的影响

图3 不同扫描速度下制备的AlSi10Mg试样的OM像

图4 扫描间距对SLM成形AlSi10Mg试样的相对密度的影响

图5 层厚对SLM成形AlSi10Mg试样的相对密度的影响

图6 SLM成形AlSi10Mg合金沉积态横截面SEM像

图7 SLM成形AlSi10Mg合金的EDS面扫描结果

图8 沉积态和热处理后AlSi10Mg的微观组织

图9 不同条件下的AlSi10Mg试样的XRD谱

图10 沉积态AlSi10Mg试样的应力-应变曲线

图11 SLM成形AlSi10Mg试样显微硬度随扫描速度的变化

图12 沉积态及热处理态的常温力学性能

图13 不同热处理工艺下的SLM成形AlSi10Mg试样显微硬度

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