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Elucidating the Relations Between Monotonic and Fatigue Properties of Laser Powder Bed Fusion Stainless Steel 316L

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Abstract

The laser powder bed fusion (L-PBF) technique builds parts with higher static strength than the conventional manufacturing processes through the formation of ultrafine grains. However, its fatigue endurance strength σ f does not match the increased monotonic tensile strength σ b. This work examines the monotonic and fatigue properties of as-built and heat-treated L-PBF stainless steel 316L. It was found that the general linear relation σ f = mσ b for describing conventional ferrous materials is not applicable to L-PBF parts because of the influence of porosity. Instead, the ductility parameter correlated linearly with fatigue strength and was proposed as the new fatigue assessment criterion for porous L-PBF parts. Annealed parts conformed to the strength-ductility trade-off. Fatigue resistance was reduced at short lives, but the effect was partially offset by the higher ductility such that comparing with an as-built part of equivalent monotonic strength, the heat-treated parts were more fatigue resistant.

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Acknowledgements

This work was supported by the Singapore Economic Development Board (EDB) Industrial Postgraduate Programme (IPP).

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Authors and Affiliations

  1. Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Meng Zhang & Hua Li

  2. Singapore Institute of Manufacturing Technology, ASTAR, 73 Nanyang Drive, Singapore, 637662, Singapore

    Chen-Nan Sun & Jun Wei

  3. Faculty of Engineering, Environment and Computing, Coventry University, Coventry, CV1 5FB, UK

    Xiang Zhang

  4. Lloyd’s Register Global Technology Centre, 1 Fusionopolis Place, #09-11 Galaxis, Singapore, 13852, Singapore

    Phoi Chin Goh & David Hardacre

Authors
  1. Meng Zhang
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  2. Chen-Nan Sun
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  3. Xiang Zhang
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  4. Phoi Chin Goh
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  5. Jun Wei
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  6. Hua Li
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  7. David Hardacre
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Correspondence to Hua Li.

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Zhang, M., Sun, CN., Zhang, X. et al. Elucidating the Relations Between Monotonic and Fatigue Properties of Laser Powder Bed Fusion Stainless Steel 316L. JOM 70, 390–395 (2018). https://doi.org/10.1007/s11837-017-2640-z

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  • DOI: https://doi.org/10.1007/s11837-017-2640-z

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