The Effect of a Scanning Strategy on the Residual Stress of 316L Steel Parts Fabricated by Selective Laser Melting (SLM)

Wang, Di; Wu, Shibiao; Yang, Yongqiang; Dou, Wenhao; Deng, Shishi; Wang, Zhi; Li, Sheng

doi:10.3390/ma11101821

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The Effect of a Scanning Strategy on the Residual Stress of 316L Steel Parts Fabricated by Selective Laser Melting (SLM)

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Sheng Li

Department of Mechatronics Engineering, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China

School of Metallurgy and Materials, The University of Birmingham, Birmingham B152TT, UK

Authors to whom correspondence should be addressed.

Materials 2018, 11(10), 1821; https://doi.org/10.3390/ma11101821

Received: 28 August 2018 / Revised: 13 September 2018 / Accepted: 19 September 2018 / Published: 25 September 2018

(This article belongs to the Collection Additive Manufacturing: Alloy Design and Process Innovations)

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Abstract

The laser scanning strategy has an important influence on the surface quality, residual stress, and deformation of the molten metal (deformation behavior). A divisional scanning strategy is an effective means used to reduce the internal stress of the selective laser melting (SLM) metal part. In order to understand and optimize the divisional scanning strategy, three divisional scanning strategies and an S-shaped orthogonal scanning strategy are used to produce 316L steel parts in this study. The influence of scanning strategy on the produced parts is verified from the aspects of densification, residual stress distribution and deformation. Experiments show that the 316L steel alloy parts adopted spiral divisional scanning strategy can not only obtain the densification of 99.37%, but they also effectively improve the distribution of residual stress and control the deformation degree of the produced parts. Among them, the spiral divisional scanning sample has the smallest residual stress in plane direction, and its σ_x and σ_y stress are controlled within 204 MPa and 103 MPa. The above results show that the spiral divisional scanning is the most conducive strategy to obtain higher residual stress performance of SLM 316L steel parts. View Full-Text

Keywords: selective laser melting; divisional scanning; residual stress; deformation

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MDPI and ACS Style

Wang, D.; Wu, S.; Yang, Y.; Dou, W.; Deng, S.; Wang, Z.; Li, S. The Effect of a Scanning Strategy on the Residual Stress of 316L Steel Parts Fabricated by Selective Laser Melting (SLM). Materials 2018, 11, 1821. https://doi.org/10.3390/ma11101821

AMA Style

Wang D, Wu S, Yang Y, Dou W, Deng S, Wang Z, Li S. The Effect of a Scanning Strategy on the Residual Stress of 316L Steel Parts Fabricated by Selective Laser Melting (SLM). Materials. 2018; 11(10):1821. https://doi.org/10.3390/ma11101821

Chicago/Turabian Style

Wang, Di, Shibiao Wu, Yongqiang Yang, Wenhao Dou, Shishi Deng, Zhi Wang, and Sheng Li. 2018. "The Effect of a Scanning Strategy on the Residual Stress of 316L Steel Parts Fabricated by Selective Laser Melting (SLM)" Materials 11, no. 10: 1821. https://doi.org/10.3390/ma11101821

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