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Effects of Silicon on the Microstructure and Mechanical Properties of 15–15Ti Stainless Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Effects of silicon on the microstructure and mechanical properties of 20% cold-worked 15–15Ti austenitic stainless steels are systemically investigated by uniaxial tensile tests, scanning and transmission electron microscope observations, and strength calculations. The results reveal that a large number of deformation twins are formed in the 20% cold-worked steels with various silicon additions. The volume fraction of deformation twins and the density of dislocations increase with silicon content, while the twin thickness slightly decreases. A better strength–ductility combination is achieved by silicon addition, since the yield strength of the steel with 2% silicon is 61 MPa higher than that of the steel with 1% silicon, while their uniform elongations are almost both equal to 16%. The yield strength of the 15–15Ti stainless steels is predominantly contributed by the solid solution, dislocation and deformation twin strengthening effects, which can be enhanced by silicon addition.

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Acknowledgements

This work is financially supported by the Natural Science Foundation of Liaoning Province, China (Grant No. 2019-BS-248).

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Authors and Affiliations

  1. China Nuclear Power Technology Research Institute, Shenzhen, 518000, China

    Hao-Yu Yi

  2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Tian Liang, Min Wang, Xiang-Dong Zha, Ying-Che Ma & Kui Liu

Authors
  1. Hao-Yu Yi
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  2. Tian Liang
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  3. Min Wang
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  4. Xiang-Dong Zha
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  5. Ying-Che Ma
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  6. Kui Liu
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Contributions

H-YY was involved in writing—original draft preparation; MW was involved in writing—review and editing; TL contributed to methodology; X-DZ contributed to investigation; Y-CM was involved in validation; and KL was involved in supervision.

Corresponding authors

Correspondence to Min Wang or Ying-Che Ma.

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Available online at https://link.springer.com/journal/40195.

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Yi, HY., Liang, T., Wang, M. et al. Effects of Silicon on the Microstructure and Mechanical Properties of 15–15Ti Stainless Steel. Acta Metall. Sin. (Engl. Lett.) 33, 1583–1590 (2020). https://doi.org/10.1007/s40195-020-01068-2

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  • DOI: https://doi.org/10.1007/s40195-020-01068-2

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