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Effects of Cell Network Structure on the Strength of Additively Manufactured Stainless Steels

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Abstract

The rapid melting and solidification cycle in additive manufacturing creates a non-equilibrium environment that induces metastable microstructures. These metastable microstructures include solute heterogeneity, dislocation cell structure and nano-sized precipitation, which contributes to the strength of additively manufactured alloys. Because the presence of metastable microstructure contributes to the mechanical property enhancement of additively manufactured alloy, quantification and estimation of strength by metastable microstructure becomes important issue. In this study, the role of dislocation cell structure on the mechanical property of additively manufactured stainless steels was investigated. The evolved cell networks not only interrupted dislocation gliding, but also acted as crack propagation paths during plastic deformation. The finer cell networks found in the additively manufacture 304L stainless steels induced more interactions with dislocations than those found in the additively manufacture 316L stainless steels, and that is related to the higher strength during tensile test. This result demonstrates the dislocation cell structure is a main strengthening mechanism for additively manufactured materials and the modified Hall–Petch hardening model successfully estimate the strengthening by cell boundaries.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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  • 08 July 2021

    The Graphic Abstract has been included

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2017R1A2A1A18069427). This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2020R1A4A3079417). The Technology Innovation Program (Alchemist Project, 20012196, Al based supercritical materials discovery) also funded by the Ministry of Trade, Industry & Energy, Korea.

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Authors and Affiliations

  1. Department of Materials Engineering and Convergence Technology (Center for K-Metals), Gyeongsang National University, Jinju, 52828, Republic of Korea

    Jung Gi Kim, Jae Bok Seol & Hyokyung Sung

  2. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Jeong Min Park & Hyoung Seop Kim

  3. Materials Solution Research Group, Research Institute of Industrial Science and Technology, Pohang, 37673, Republic of Korea

    Sun Hong Park

  4. Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Hyoung Seop Kim

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  1. Jung Gi Kim
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Correspondence to Jung Gi Kim or Hyoung Seop Kim.

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Kim, J.G., Seol, J.B., Park, J.M. et al. Effects of Cell Network Structure on the Strength of Additively Manufactured Stainless Steels. Met. Mater. Int. 27, 2614–2622 (2021). https://doi.org/10.1007/s12540-021-00991-y

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