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Materials 2018, 11(8), 1480;

Estimation of Residual Stress in Selective Laser Melting of a Zr-Based Amorphous Alloy

School of Materials Science and Engineering, and State key Lab for Materials Processing and Die & mold Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Authors to whom correspondence should be addressed.
Received: 19 July 2018 / Revised: 11 August 2018 / Accepted: 17 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Additive Manufacturing: Alloy Design and Process Innovations)
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An accurate estimation of residual stresses is crucial to ensure dimensional accuracy and prevent premature fatigue failure of 3D printed components. Different from their crystalline counterparts, the effect of residual stress would be worse for amorphous alloys owing to their intrinsic brittleness with low fracture toughness. However, the generation of residual stress and its performance in 3D printed amorphous alloy components still remain unclear. Here, a finite element method combined with experiments and theoretical analyses was introduced to estimate the residual stress in selective laser melting of a Zr-based amorphous alloy. The results revealed that XY cross scanning strategy exhibits relatively low residual stress by comparison with X and Y strategies, and the residual stress becomes serious with increasing bar thickness. The residual stress, on the other hand, could be tuning by annealing or preheating the substrate. The above scenario is thoroughly understood according to the temperature gradient mechanism and its effect on microstructure evaluation. View Full-Text
Keywords: selective laser melting; amorphous alloy; finite element analysis; residual stress selective laser melting; amorphous alloy; finite element analysis; residual stress

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Xing, W.; Ouyang, D.; Li, N.; Liu, L. Estimation of Residual Stress in Selective Laser Melting of a Zr-Based Amorphous Alloy. Materials 2018, 11, 1480.

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