Please use this identifier to cite or link to this item: 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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