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【增材制造】热处理对激光选区熔化AlSi10Mg合金力学性能与组织的影响
发布时间:2020-09-14 文章来源:本站原创
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刘焕文 郑超 陈素明

[西安飞机工业(集团)有限责任公司]

摘要:进行了激光选区熔化AlSi10Mg合金退火态显微组织观察、力学性能测试,并对AlSi10Mg合金进行不同热处理。结果表明,激光选区熔化AlSi10Mg合金的力学性能优于ZL104LD2合金,扫描方向组织呈扫描道带状堆积结构,成形方向呈不规则的鱼鳞状结构;随着固溶温度从525 提高到545 AlSi10Mg合金的抗拉强度和屈服强度均降低,伸长率和断面收缩率均有降低的趋势,显微组织过烧现象越来越严重,导致AlSi10Mg铝合金力学性能随之下降。从力学性能和金相组织综合考虑,AlSi10Mg铝合金在525 下固溶最佳。

关键词:激光选区熔化;AlSi10Mg;热处理;显微组织;力学性能

中图分类号:TG146.21   文献标志码    A

DOI:10.15980/j.tzzz.2020.05.013

 

Effects of Heat Treatment on Microstructure and Mechanical Properties of Laser Selective Melting AlSi10Mg Alloy

Liu Huanwen, Zheng Chao, Chen Suming

[AVIC Xi'an Aircraft Industry(Group) Co., Ltd.]

Abstract:The microstructure and mechanical properties of 3Dprinted AlSi10Mg alloy in annealing state were analyzed, and AlSi10Mg alloy was treated in different heat treatment. The results reveal that the mechanical properties of laser forming AlSi10Mg alloy are superior to those of ZL104 and LD2 alloy, and the microstructure of scanning direction presents stripshaped piledup structure, while microstructure of the forming direction shows irregular fish scale structure. With the increase of solution temperature from 525 to 545 , the mechanical properties of the AlSi10Mg alloy are decreasedsuch as tensile strength, yield strength, elongation and fracture contraction rate as a result of the increasingly serious over burning phenomenon of microstructure. Taking into account mechanical properties and metallographic structure, the optimized solution temperature for AlSi10Mg alloy is 525 .

Key Words: Selective Laser Melting, AlSi10Mg Alloy, Heat Treatment, Microstructure, Mechanical Properties

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