Microstructure, Mechanical Properties and Residual Stress of Selective Laser Melted AlSi10Mg
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JMEPEG https://doi.org/10.1007/s11665-019-04423-2
Microstructure, Mechanical Properties and Residual Stress of Selective Laser Melted AlSi10Mg Miaoxian Guo, Yi Ye, Xiaohui Jiang, and Lianfeng Wang (Submitted October 17, 2018; in revised form September 30, 2019) AlSi10Mg processed by selective laser melting (SLM) is common in various industries because of its complex structure and high performance. The microstructure, residual stress and mechanical properties restrict its application, while they are affected by the scanning path type and preheating temperature. In this work, to investigate the properties of selective laser melted AlSi10Mg alloys and gain better performance results, the microstructure and mechanical tests are performed at several preheating temperatures based on the uniformity and chessboard scanning strategy. It is found that the selective laser melted AlSi10Mg parts fabricated in the chessboard scanning path have better mechanical properties than those fabricated in the uniformity scanning path. Furthermore, a higher preheating temperature can induce less residual stress due to the enhanced Al crystal faces. Finally, analyses of the microstructures, mechanical and residual stress provide a valuable suggestion that the combination of the range of preheating temperature and the scanning path can improve the performance of selective laser melted AlSi10Mg. Keywords
AlSi10Mg, mechanical properties, microstructure, residual stress, selective laser melting
1. Introduction AlSi10Mg is a traditional cast alloy that is widely used for die casting. The alloy exhibits good weldability due to the composition being near the eutectic Al-Si and the enhanced strength by the Mg2Si precipitation sequence (Ref 1, 2). Thus, AlSi10Mg is suitable for applications in aerospace and automotive industries. The common method for using AlSi10Mg in modern industry is selective laser melting (SLM), which is an additive manufacturing for fabrication of complex parts by adding layers of powder materials and fusing them together based on computer-aided design modeling (Ref 3, 4). In particular, due to the additive and layer-wise production, SLM is essentially considered a process that provides a competitive edge in fabrication of complex features compared with other processes for AlSi10Mg alloy (Ref 5, 6). By applying SLM to produce complex-shaped parts from the AlSi10Mg material, the microstructure and performance of such parts can be significantly enhanced. Selective laser melted AlSi10Mg has good mechanical properties such as tensile strength, elongation, YoungÕs modulus, impact toughness and hardness (Ref 7). There are many influencing factors in SLM process. Kempen et al. found that the quality of the selective laser melted component depended on the powder morphology
Miaoxian Guo, Yi Ye, and Xiaohui Jiang, College of Mechanical Engineering, University of Shanghai for Science and Technology, No. 516 Jungong Road, Yangpu, Shanghai 200093, China; and Lianfeng Wang, Shanghai Aerospace Equipments Manufacturer, Shanghai 200245, Ch
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