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Title:: A Review on the Microstructure of Ti-6Al-4V Alloy by Selective Laser Melting

Author(s):: FAN Shijing1; 2; LIU Meishuai1; 2; HE Bo1; 2; 1. Research Center of High-Temperature Alloy Precision Forming, Shanghai University of Engineering Science,Shanghai 201620, China 2. School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Keywords:: selective laser melting; Ti-6Al-4V alloy; microstructure; post-treatment; mechanical property

Abstract:: Selective laser melting (SLM), as a metal additive manufacturing technology, has the characteristics of flexible control, near net shape and rapid manufacturing. In recent years, it has been widely used in the manufacturing of Ti-6Al-4V alloy, which has a broad application prospect in aerospace and biomedical fields. Due to the particularity of the SLM process, the microstructure of SLM Ti-6Al-4V alloy is significantly different from traditional castings and forgings, and usually has the characteristics of high strength and low plasticity. In order to promote the development of SLM Ti-6Al-4V alloy and improve its mechanical properties, the microstructure of SLM Ti-6Al-4V alloy is reviewed from the following aspects: the phase compositions, the morphology of the prior β grains, the morphology of α′ martensite, the mechanism between α′ martensite and dislocations, the crystallographic orientation characteristics of the prior β grains and α′ martensite. At the same time, the microstructure characteristics and mechanical properties of SLM Ti-6Al-4V alloy under different post-treatment processes are analyzed. Finally, the future development trend of the SLM Ti-6Al-4V alloy is prospected. It will provide a reference for the development, the process optimization and the improvement of mechanical properties of SLM Ti-6Al-4V alloy.