• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (8): 37-45.doi: 10.3901/JME.2020.08.037

• 特邀专栏:轻质材料焊接与连接 • 上一篇    下一篇

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退火温度对激光选区熔化AlSi10Mg合金微观组织及拉伸性能的影响

闫泰起1, 唐鹏钧2, 陈冰清1, 楚瑞坤3, 郭绍庆1, 熊华平1   

  1. 1. 中国航发北京航空材料研究院3D打印研究与工程技术中心 北京 100095;
    2. 中国航发北京航空材料研究院铝合金研究所 北京 100095;
    3. 飞而康快速制造科技有限责任公司 无锡 214145
  • 收稿日期:2019-12-25 修回日期:2020-02-04 出版日期:2020-05-28 发布日期:2020-05-28
  • 通讯作者: 陈冰清(通信作者),女,1984年出生,博士,研究员。主要研究方向为航空金属材料增材制造。E-mail:hwtkjcbq1984@163.com
  • 作者简介:闫泰起,男,1993年出生,硕士,助理工程师。主要研究方向为金属材料激光增材制造。E-mail:18201165269@163.com
  • 基金资助:
    国家国防科技工业局319专项、国家自然科学基金(51875541)和航空动力基金(6141B090328)资助项目。

Effect of Annealing Temperature on Microstructure and Tensile Properties of AlSi10Mg Alloy Fabricated by Selective Laser Melting

YAN Taiqi1, TANG Pengjun2, CHEN Bingqing1, CHU Ruikun3, GUO Shaoqing1, XIONG Huaping1   

  1. 1. 3D Printing Research and Engineering Technology Center, AECC Beijing Institute of Aeronautical Materials, Beijing 100095;
    2. Al-based Alloys Research Center, AECC Beijing Institute of Aeronautical Materials, Beijing 100095;
    3. Falcon Fast Manufacturing Technology Co., Ltd., Wuxi 214145
  • Received:2019-12-25 Revised:2020-02-04 Online:2020-05-28 Published:2020-05-28

摘要: 详细研究了退火温度对激光选区熔化成形AlSi10Mg合金微观组织和拉伸性能的影响规律。结果表明,退火后的激光选区熔化成形AlSi10Mg合金组织中网状共晶Si发生断裂、粗化;随着退火温度升高,网状共晶Si发生球化,以颗粒状均匀分布在Al基体中,且弥散二次Si粒子也逐渐溶解消失。激光选区熔化成形AlSi10Mg合金经退火后,其延伸率大幅提高,拉伸断口表现出韧性断裂特征。在270~280℃下退火2 h,延伸率分别达到15.7%(X/Y向)和12.7%(Z向)以上,且强度保持在一个较高的水平(300 MPa),实现了强度/塑性的良好匹配。通过拉伸试样断口分析,认为导致裂纹源萌生的主要原因是未熔粉体、气孔及氧化物等缺陷。

关键词: 激光选区熔化, AlSi10Mg合金, 退火, 微观组织, 拉伸性能

Abstract: The effect of annealing temperature on microstructure and tensile properties of AlSi10Mg alloy fabricated by selective laser melting (SLM) technology is studied. The experimental results show that the net-like eutectic Si in the as-built samples is fractured and roughened during annealing. With the increase of annealing temperature, the net-like eutectic Si is spheroidized and evenly distributed in Al matrix as particles, and the dispersive secondary Si particles in Al matrix gradually dissolve and disappeare. After annealing treatment, the elongation of SLM fabricated AlSi10Mg alloy is greatly increased, and the fracture surface is characterized by dimples. After 270-280℃ annealing for 2 h, the elongation reaches above 15.7%(X/Y direction) and 12.7%(Z direction), with the tensile strength still remained at a high level(300 MPa), which indicates a good strength/plasticity match. Based on the fracture analysis results of tensile samples, it is believed that the main reasons for the crack initiation are the as-built defects including unmelted powder, pores and oxides.

Key words: selective laser melting, AlSi10Mg, annealing, microstructure, tensile properties

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