Transactions of Materials and Heat Treatment

Title：Influence and optimization of forming process parameters on relative density of 316L stainless steel prepared by selective laser melting

Authors： Pan Lu Zhang Chenglin Jiang Hua Liu Tong Wang Liang

Unit： Anhui Technical College of Mechanical and Electrical Engineering Anhui Chungu 3D Printing Institute of Intelligent Equipment and Industrial TechnologyAnhui Chungu 3D Printing Institute of Intelligent Equipment and Industrial Technology HIT-Chungu Joint Research Center for Additive Manufacturing Materials University of Science and Technology of China Anhui Top Additive Manufacturing Technology Co. Ltd.

KeyWords： selective laser melting line energy density relative density bubble porosity

ClassificationCode：O436

year,vol(issue):pagenumber：2019,44(11):103-109

Abstract：

In order to improve the relative density of 316L stainless steel prepared by selective laser melting, the experiment was designed to optimize the main technological parameters (laser power and laser scanning speed) affecting the relative density, and the influences of laser power and laser scanning velocity on porosity, cracks and bubbles were analyzed by optical microscope and scanning electron microscope. Then, the influences of process parameters on the relative density were characterized comprehensively by introducing the linear energy density, and a predictive mathematical model of relative density of 316L stainless steel for desktop metal 3D printer was established. The results show that the laser power and laser scanning speed have a significant effect on the relative density of formed parts. When the linear energy density is 175-250 J·m-1, the relative density of formed parts for 316L stainless steel is over 99.95%, and when the laser power is 200 W and the laser scanning speed is 900 mm·s-1, the relative density is up to 99.98%.

Funds：

2019年安徽省高校自然科学研究重点项目(KJ2019A1157)；2019年安徽省高校优秀拔尖人才培育资助项目(gxgnfx2019100)；2019年哈工大-安徽春谷高端金属材料联合研发中心开放课题（HITCG2018100）

潘露（1986-），男，硕士，讲师，E-mail：ahjdpanlu@126.com

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