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Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

  • Xiao-qing Ni
  • De-cheng Kong
  • Ying Wen
  • Liang ZhangEmail author
  • Wen-heng Wu
  • Bei-bei He
  • Lin Lu
  • De-xiang Zhu
Article
  • 34 Downloads

Abstract

The corrosion behavior and mechanical properties of 316L stainless steel (SS) fabricated via selective laser melting (SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile experiments. The microstructural anisotropy of SLMed 316L SS was also investigated by electron back-scattered diffraction and transmission electron microscopy. The grain sizes of the SLMed 316L SS in the XOZ plane were smaller than those of the SLMed 316L SS in the XOY plane, and a greater number of low-angle boundaries were present in the XOY plane, resulting in lower elongation for the XOY plane than for the XOZ plane. The SLMed 316L was expected to exhibit higher strength but lower ductility than the wrought 316L, which was attributed to the high density of dislocations. The pitting potentials of the SLMed 316L samples were universally higher than those of the wrought sample in chloride solutions because of the annihilation of MnS or (Ca,Al)-oxides during the rapid solidification. However, the molten pool boundaries preferentially dissolved in aggressive solutions and the damage of the SLMed 316L in FeCl3 solution was more serious after long-term service, indicating poor durability.

Keywords

selective laser melting mechanical property corrosion resistance 316L stainless steel anisotropy molten pool boundary 

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Notes

Acknowledgements

This work was financially supported by the Shanghai Materials Genome Institute No. 5 (No. 16DZ2260605), the Shanghai Sailing Program (No. 17YF1405400), and the Project to Strengthen Industrial Development at the Grass-roots Level (No. TC160A310/19).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Xiao-qing Ni
    • 1
  • De-cheng Kong
    • 2
  • Ying Wen
    • 2
  • Liang Zhang
    • 1
    Email author
  • Wen-heng Wu
    • 1
  • Bei-bei He
    • 1
  • Lin Lu
    • 1
  • De-xiang Zhu
    • 1
  1. 1.Shanghai Engineering Research Center of 3D Printing MaterialsShanghai Research Institute of MaterialsShanghaiChina
  2. 2.Corrosion and Protection Center, Key Laboratory for Corrosion and Protection (MOE)University of Science and Technology BeijingBeijingChina

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