Transactions of Materials and Heat Treatment

Title：Analysis on forming quality of 316L stainless steel small thin-walled complex parts by selective laser melting

Authors： Men Zhengxing Liu Jianchao Zhou Jie Wang Changfei Ma Yaxin Tang Yue

Unit： Chengdu Aeronautic Polytechnic Chongqing University

KeyWords： selective laser melting 316L stainless steel impeller laser volume energy density dimensional precision

ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(6):102-106

Abstract：

In order to evaluate the quality of the formed parts produced by the first 500 W selective laser melting (SLM) equipment YS-340M with completely independent intellectual property rights in Southwest China, a typical small thin-walled complex part impeller was manufactured by 316L stainless steel powder, and its mechanical properties, microstructure and dimensional accuracy of impeller were tested by universal tensile testing machine, metallographic microscope, scanning electron microscope and 3D laser scanner. The test results show that its tensile strength and yield strength are 615.6 MPa and 528 MPa respectively when the laser volume energy density is 97.2 J·mm-3, and the mechanical properties formed part are anisotropic, namely, the strength in the vertical direction is about 90% of the horizontal direction. Furthermore, the fracture of sample is a typical ductile fracture with spherical powders which are incompletely melted, and the overall dimensional deviation of the forming impeller and the theoretical model is less than 0.2 mm to reach the dimensional accuracy IT12, which is consistent with the dimensional accuracy of the part formed by warm forging and exceeds the dimensional accuracy of the part formed by hot forging.

Funds：

四川省科技厅项目（2019YJ0519）；四川省教育厅项目（18ZA0031，18ZB0050）

门正兴（1980-），男，博士，高级工程师，教授 E-mail：amen1980@163.com

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