选区激光熔化WC/AlSi10Mg复合材料的微观组织和疲劳性能

doi:10.11896/cldb.18090274

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Abstract In order to improve the fatigue properties of the selected laser melting (SLM) forming AlSi10Mg alloy, a sample of AlSi10Mg composite containing nano-WC was obtained by selective laser melting forming technology. The microstructure of AlSi10Mg alloy sample was observed by OM and SEM. The microhardness and fatigue properties of AlSi10Mg alloy parts were studied by microhardness tester and high frequency fatigue tes-ter. The results show that different solidification conditions in the inside and outside make the growth morphology of the two grains different. The boundary of the pool is cellular crystal and the interior is dendritic crystal. The molten pool is divided into three regions: coarse grain zone, heat-affected zone and fine grain zone. The corresponding average α-Al matrix size is about 1.5 μm, 1 μm and 0.6 μm, respectively, and the average eutectic Si width decreases in turn, about 0.5 μm. The Al-Si eutectic content is (40±3)%, (37±4)%, (30±2)%, respectively, but both are smaller than the eutectic structure of the Al-Si phase diagram at equilibrium, and most of the Si is dissolved in supersaturated form. In the Al matrix. Nano WC is enriched in the grain boundary, and part of the WC undergoes dissolution diffusion burning. The fatigue test results show that the fracture of the specimens has cleavage fracture characteristics, and the fatigue crack originates in the sub-surface layer of the specimens due to the existence of serious inclusions. The high cycle fatigue life of the specimens obeys three-parameter Weibull distribution, and the life prediction model of 3D printed specimens is established.

Key words： selective laser melting microstructure fatigue behavior

Published: 16 September 2019

CLC number:

TG14

Fund:This work was supported by the National Key Research and Development Program of China (2017YFB1103701).

About author:: Han Ye, born in December 1976, Ph.D. in Enginee-ring, is an associate professor at Nanchang University, a master tutor in mechanical engineering and instrumentation, a senior meber of the China Mechanical Engineering Society, a director of the Mechanical Manufacturing Laboratory at Nanchang University, and a deputy director of the Machinery Manufacturing Institute. He graduated from Nanjing University of Aeronautics and Astronautics in July 2005. In the same year, he entered the School of Mechanical and Electrical Engineering of Nanchang University for teaching and research. From September 2015 to October 2016, he visited the University of Purdue. His research interests are advanced ma-nufacturing techniques and equipment.
叶寒, 1976年12月生,工学博士,现为南昌大学副教授,机械工程和仪器仪表方向硕士生导师,中国机械工程学会高级会员,南昌大学机械制造实验室主任,机械制造研究所副所长。2005年7月毕业于南京航空航天大学,同年进入南昌大学机电工程学院从事教学和科研工作,2015年9月至2016年10月期间于美国普渡大学访学。研究方向为先进制造技术与装备。

Yong Liu, born in February 1980, is a doctor, professor, master/director. Dr. Shanghai Jiaotong University, Distinguished Professor and Ph.D. Has long been engaged in the teaching and research of non-ferrous metal materials processing. Hosted or participated in 11 national projects such as the National Natural Science Foundation of China, the National Key Research and Development Program, the National Science and Technology Support Program, and the Hong Kong Research Grants Council. He was selected as the 2012 National Xiangjiang Scholar Talent Program and was selected as one of the outstanding Jiangxi Provinces in 2016. The Young Talents Program and the Jiangxi Province Talent Project, served as Executive Chairman of the China Association for Science and Technology Young Scientists Forum, Secretary General of the National Magnesium Alloys Youth Committee, and Chairman of the Third National Magnesium Alloy Youth Academic Conference. Has nearly four years of overseas work experience in France, the United States and Hong Kong (China). He has published 45 SCI papers in internationally renowned journals such as Carbon, and applied for 12 national invention patents. Now he is review experts of more than 20 international and domestic well-known journals. The research results won the Youth Excellent Paper Award of China Materials Seminar, the Second Prize of Jiangxi Province Technology Invention, the Third Prize of Natural Science of Jiangxi Province and the Second Prize of Science and Technology Achievements of Jiangxi Higher Education Institution.

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Cite this article:

YE Han,ZHANG Jianqiang,HUANG Junqiang, et al. Microstructure and Fatigue Properties of Selected Laser-melted WC/AlSi10Mg Composites[J]. Materials Reports, 2019, 33(22): 3789-3794.

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http://www.mater-rep.com/EN/10.11896/cldb.18090274 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3789

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