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https://hdl.handle.net/10356/142421
Title: | Process parameter optimization and mechanical properties for additively manufactured stainless steel 316L parts by selective electron beam melting | Authors: | Wang, Chengcheng Tan, Xipeng Liu, Erjia Tor, Shu Beng |
Keywords: | Engineering::Mechanical engineering | Issue Date: | 2018 | Source: | Wang, C., Tan, X., Liu, E., & Tor, S. B. (2018). Process parameter optimization and mechanical properties for additively manufactured stainless steel 316L parts by selective electron beam melting. Materials and Design, 147, 157-166. doi:10.1016/j.matdes.2018.03.035 | Journal: | Materials and Design | Abstract: | This work presents an experimental study of process optimization of the pair of critical parameters (speed function (SF) and focus offset (FO)) for stainless steel 316 L (SS316L) parts additively manufactured by selective electron beam melting (SEBM). Here, there are two sets of optimized SF-FO parameters that could build SS316L parts with high relative densities (>99%) and well-melted top build surfaces. Tensile test results show that most of the SEBM-built SS316L samples exhibit higher tensile strengths than the conventional cast and wrought counterparts, whereas their ductility is lower. In addition, strong anisotropic tensile properties are observed for the SEBM-built SS316L samples, e.g. they generally have better tensile properties when loaded parallel to the build direction as compared to the horizontal direction. However, a large number of σ phase was found to precipitate at grain boundaries in the SS316L samples fabricated under lower SF and larger FO with a higher build temperature, which evidently deteriorates their tensile properties particularly for the horizontal direction. It is suggested that SEBM process parameters for SS316L must be optimized to avoid σ phase precipitation at elevated temperatures apart from a well-melted top build surface and a high relative density. | URI: | https://hdl.handle.net/10356/142421 | ISSN: | 0261-3069 | DOI: | 10.1016/j.matdes.2018.03.035 | Schools: | School of Mechanical and Aerospace Engineering | Research Centres: | Singapore Centre for 3D Printing | Rights: | © 2018 Elsevier Ltd. All rights reserved. | Fulltext Permission: | none | Fulltext Availability: | No Fulltext |
Appears in Collections: | SC3DP Journal Articles |
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