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Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting

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Acta Metallurgica Sinica (English Letters) Aims and scope

A Correction to this article was published on 01 December 2020

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Abstract

Previous studies have revealed that laser power and energy density are significant factors affecting the quality of parts manufactured by selective laser melting (SLM). The normalized equivalent density E0* and dimensionless laser power q*, which can be regarded as a progress on the understanding of the corresponding dimensional quantities, are adopted in this study to examine the defects, melt pool shape, and primary dendrite spacing of the SLM-manufactured 316L stainless steel, because it reflects the combined effect of process parameters and material features. It is found that the number of large defects decreases with increasing E0* due to enough heat input during the SLM process, but it will show an increasing trend when excessive heat input (i.e., utilizing a high E0*) is imported into the powder bed. The q* plays an important role in controlling maximum temperature rising in the SLM process, and in turn, it affects the number of large defects. A large q* value results in a low value of absolute frequency of large defects, whereas a maximum value of absolute frequency of large defects is achieved at a low q* even if E0* is very high. The density of the built parts is greater at a higher q* when E0* remains constant. Increasing the melt pool depth at relatively low value of E0* enhances the relative density of the parts. A narrow, deep melt pool can be easily generated at a high q* when E0* is sufficiently high, but it may increase melt pool instability and cause keyhole defects. It is revealed that a low E0* can lead to a high cooling rate, which results in a refined primary dendrite spacing. Relatively low E0* is emphasized in selecting the process parameters for the tensile test sample fabrication. It shows that excellent tensile properties, namely ultimate tensile strength, yield strength, and elongation to failure of 773 MPa, 584 MPa, and 46%, respectively, can be achieved at a relatively low E0* without heat treatment.

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Acknowledgements

This work has been supported by the National Natural Science Foundation of China (Grant No. 11772344) and the National Key R&D Program of China (Project No. 2016YFB1100700). The authors would like to thank PhD candidate, Yan-Sen Li, for the experimental assistance concerning scanning electron microscopy.

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Authors and Affiliations

  1. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100190, China

    Hua-Zhen Jiang, Qi-Sheng Chen & Jing-Yu Hou

  2. Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

    Hua-Zhen Jiang, Zheng-Yang Li, Qi-Sheng Chen, Jing-Yu Hou & He-Jian Xu

  3. Beijing E-Plus-3D Technology Co., LTD, Beijing, 102299, China

    Tao Feng, Peng-Yue Wu, Yun-Long Feng & Long-Fei Chen

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  1. Hua-Zhen Jiang
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Correspondence to Zheng-Yang Li or Qi-Sheng Chen.

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Jiang, HZ., Li, ZY., Feng, T. et al. Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting. Acta Metall. Sin. (Engl. Lett.) 34, 495–510 (2021). https://doi.org/10.1007/s40195-020-01143-8

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  • DOI: https://doi.org/10.1007/s40195-020-01143-8

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