Microstructures and Mechanical Properties of AlSi10Mg Aluminum Alloy Fabricated by Laser Melting Deposition

被引：1
|
作者：
Lü F. [1 ]
Tian Z. [1 ]
Liang H. [1 ]
Xie D. [1 ]
Shen L. [1 ]
Xiao M. [2 ]
机构：
[1] College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, Jiangsu
[2] Nanjing Institute of Advanced Laser Technology, Nanjing, 210038, Jiangsu
来源：
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | 2018年 / 46卷 / 10期
基金：
中国国家自然科学基金;
关键词：
AlSi10Mg; Laser melting deposition (LMD); Micro-hardness; Microstructure; Tensile property;
D O I：
10.3969/j.issn.1000-565X.2018.10.016
中图分类号：
学科分类号：
摘要：
In order to improve the manufacturing quality of the AlSi10Mg aluminum alloy fabricated by laser mel-ting deposition (LMD) based on coaxial powder feeding, this paper carries out the single tracks test, block samples forming experiments and tensile property test to investigate the variation trend on the microstructure and property under different process parameters. The experimental results showed that the manufacturing quality of the LMD processed samples was significantly governed by energy density of laser beam and the hatch spacing. Tensile property was improved by decreasing the level of porosity and enhancing the effect of solid solution strengthening. After the process optimization, the morphology of the single tracks was smooth without spheroidization. The relative density of the block samples was increased to 99.2% without larger pores and cracks. The microstructure of samples had directional rapid solidification characteristics with Al-Si eutectic microstructure containing three microstructures of cellular crystal, columnar dendritic crystal and divergent dendrite crystal. With the increase of cooling rate, the solubi-lity of Si phase in Al matrix was increased to 7.6%. The effect of solid solution strengthening was enhanced. Therefore, AlSi10Mg samples fabricated by laser melting deposition with good performance could be obtained by optimizing the process parameters. The tensile stress of the samples was 292MPa, which was 33% higher than that of the cast samples. © 2018, Editorial Department, Journal of South China University of Technology. All right reserved.
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页码：117 / 125
页数：8
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