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Effects of Annealing on the Microstructure and Mechanical Properties of Selective Laser Melted AlSi7Mg Alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING(2019)

Huazhong Univ Sci & Technol

Cited 174|Views13
Abstract
Selective laser melting, due to the high energy density input and the small interaction time (10(6) K/s), can result in an ultrafine microstructure and excellent mechanical properties. However, due to the nonuniform nature of the temperature distribution and the transition from liquid to solid, high residual stresses exist. High residual stresses in the parts can increase the risk of material distortion and cause many problems, such as dimensional inaccuracy or cracks. This work systematically investigated the influence of annealing on the microstructure and mechanical properties of SLM-processed AlSi7Mg alloy parts. The residual stresses relaxed significantly after annealing. The Vickers hardness and the tensile stress greatly reduced, while the elongation increased. The fracture mode of the as-fabricated sample was ductile and brittle mixed fracture, whereas the fracture morphology of the annealed sample presented many more dimples, and the elongation also increased, which indicated the ductile mode.
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Key words
Selective laser melting,Annealing,Residual stresses,Mechanical properties
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要点】:研究系统探讨了退火处理对选择性激光熔化AlSi7Mg合金微观结构和力学性能的影响,发现退火能够显著降低残余应力,改善材料的延展性。

方法】:通过选择性激光熔化技术制造AlSi7Mg合金,并对样品进行不同时间的退火处理,随后使用Vickers硬度测试和拉伸测试评估其力学性能。

实验】:在退火处理后,通过实验观察到残余应力显著降低,Vickers硬度和拉伸应力减少,延展性提高,并且样品的断裂模式由混合的韧性-脆性断裂转变为韧性断裂;实验使用的数据集为选择性激光熔化处理的AlSi7Mg合金样品。