Differences in microstructure and properties between selective laser melting and traditional manufacturing for fabrication of metal parts: A review

Abstract

Selective laser melting (SLM), as one of the additive manufacturing technologies, is widely investigated to fabricate metal parts. In SLM, parts are manufactured directly from powders in a layer-by-layer fashion; SLM also provides several advantages, such as production of complex parts with high three-dimensional accuracy, compared with other additive manufacturing technologies. Therefore, SLM can be applied in aeronautics, astronautics, medicine, and die and mould industry. However, this technique differs from traditional methods, such as casting and forging; for instance, the former greatly differs in terms of microstructure and properties of products. This paper summarizes relevant studies on metal material fabrication through SLM. Based on a work completed in Huazhong Univ. Sci Tech., Rapid Manuf. Center (HUST-RMC) and compared with characteristics described in other reported studies, microstructure, properties, dimensional accuracy, and application of SLM are presented.

Graphical abstract

Keywords

selective laser melting / microstructure / performance / application

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (Grant No. 51375189), National Key Technology R&D Program of Ministry of Science and Technology of China (Grant No. 2010BAF08B03), Hubei Science and Technology Support Program (Grant No. 2014BAA017), Wuhan Chenguang Program (Grant No. 2014072704011251), independent school subjects and independent Die & Mould Technology in Huazhong University of Science and Technology subjects. This paper refers to a large number of online papers produced by HUST-RMC. Thank you for the supporting tests of State Key Laboratory of Material Processing and Die & Mould Technology and Analysis and Test Center in Huazhong University of Science and Technology.

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