Abstract
The Inconel 625 (IN625) superalloy has a high strength, excellent fatigue, and creep resistance under high-temperature and high-pressure conditions, and is one of the critical materials used for manufacturing high-temperature bearing parts of aeroengines. However, the poor workability of IN625 alloy prevents IN625 superalloy to be used in wider applications, especially in applications requiring high geometrical complexity. Laser powder bed fusion (LPBF) is a powerful additive manufacturing process which can produce metal parts with high geometrical complexity and freedom. This paper reviews the studies that have been done on LPBF of IN625 focusing on the microstructure, mechanical properties, the development of residual stresses, and the mechanism of defect formation. Mechanical properties such as microhardness, tensile properties, and fatigue properties reported by different researchers are systematically summarized and analyzed. Finally, the remaining issues and suggestions on future research on LPBF of IN625 alloy parts are put forward.
Highlights
Additive manufacturing (AM), known as 3D printing, is an advanced manufacturing technology developed in the past 30 years [1,2,3]
Whereas according to the discussion of Balbaa et al [67], there was no clear trend of influence of process parameters on surface residual stresses in Laser powder bed fusion (LPBF) Inconel 625 (IN625) parts
Adopting the multi-laser method to increase the construction efficiency, the mechanical properties of the LPBF samples are still comparable with a single laser method and heat treatment at 1048 ◦ C for 1 h can reduce the strength of the multi-laser specimen and improve the plasticity to a certain extent [61]
Summary
Zhihua Tian 1,2,† , Chaoqun Zhang 1, *,† , Dayong Wang 3,4 , Wen Liu 5 , Xiaoying Fang 6 , Daniel Wellmann 1,7 , Yongtao Zhao 2 and Yingtao Tian 7. Shanghai Key Laboratory of Digital Manufacture for Thin-Walled Structures, School of Mechanical. Zhihua Tian and Chaoqun Zhang contribute to this paper. Received: November 2019; Accepted: December 2019; Published: 20 December 2019
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