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Effects of Heat Treatments on Microstructure and Mechanical Properties of AlSi10Mg Alloy Produced by Selective Laser Melting
Wang Yue1,2; Wang Jijie1; Zhang Hao2; Zhao Hongbo2; Ni Dingrui2; Xiao Bolv2; Ma Zongyi2
Corresponding AuthorNi Dingrui(drni@imr.ac.cn)
2021-05-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume57Issue:5Pages:613-622
AbstractThe urgent need for lightweight, high-accuracy, and personalized products has led to the rapid development of additive manufacturing. Selective laser melting (SLM), which is a very promising additive manufacturing technique, has attracted remarkable attention. The mechanical properties of SLM parts are highly related to the formation of pores and cracks. In this work, SLM parameters for AlSi10Mg alloy were optimized, and the SLM AlSi10Mg sample with a high relative density of 99.63% was obtained. The SLM sample exhibited good properties, including an ultimate tensile strength (UTS) of approximately 478 MPa, a total elongation of 8%, and an average hardness of 122 HV along the horizontal direction. However, due to a high cooling rate, an inhomogeneous microstructure with refined grains and a Si network was obtained. To achieve a homogeneous microstructure and further improve the elongation of the SLM samples, the effect of heat treatments on the microstructure and mechanical properties of the SLM samples along the horizontal direction was analyzed. After the heat treatments, the strength of the samples changed significantly and the elongation was significantly improved. Further, after a solid solution treatment at 540 degrees C for 1 h, the UTS significantly decreased to approximately 246 MPa and the elongation increased to more than 22%. For the sample annealed at 236 degrees C for 10 h, a UTS of approximately 368 MPa and elongation of approximately 17% were obtained. Moreover, the sample subjected to ageing at 130 degrees C for 4 h exhibited a high strength similar to the level of the SLM sample, the elongation was increased to approximately 11.9%, and the hardness was approximately 133 HV which is 10% higher than that of the SLM sample. The improved performance of the aged samples can be attributed to the combination of solution strengthening, microstructural refinement, and precipitation strengthening. The results show that low-temperature ageing is the optimized heat-treatment method for SLM samples with fine microstructures.
Keywordadditive manufacturing selective laser melting AlSi10Mg alloy heat treatment mechanical property
Funding OrganizationNational Key Research and Development Program of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
DOI10.11900/0412.1961.2020.00253
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFB0703104] ; Strategic Priority Research Program of the Chinese Academy of Sciences
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000642002500005
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161256
Collection中国科学院金属研究所
Corresponding AuthorNi Dingrui
Affiliation1.Shenyang Aerosp Univ, Coll Mat Sci & Engn, Shenyang 110136, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wang Yue,Wang Jijie,Zhang Hao,et al. Effects of Heat Treatments on Microstructure and Mechanical Properties of AlSi10Mg Alloy Produced by Selective Laser Melting[J]. ACTA METALLURGICA SINICA,2021,57(5):613-622.
APA Wang Yue.,Wang Jijie.,Zhang Hao.,Zhao Hongbo.,Ni Dingrui.,...&Ma Zongyi.(2021).Effects of Heat Treatments on Microstructure and Mechanical Properties of AlSi10Mg Alloy Produced by Selective Laser Melting.ACTA METALLURGICA SINICA,57(5),613-622.
MLA Wang Yue,et al."Effects of Heat Treatments on Microstructure and Mechanical Properties of AlSi10Mg Alloy Produced by Selective Laser Melting".ACTA METALLURGICA SINICA 57.5(2021):613-622.
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