Grain size effect on the mechanical behavior of metastable Fe-23Cr-8.5Ni alloy

Lin Xie, Chunpeng Wang, Yuhui Wang, Guilin Wu, Xiaoxu Huang

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Abstract

An Fe-23Cr-8.5Ni alloy was used as a model material to study the grain size effect on the mechanical behavior of metastable duplex metal. Alloy samples with different grain sizes ranging from 0.1 to 2 µm were prepared by cold-rolling and annealing. A structural refinement to about 0.1 µm results in a high yield strength but very limited ductility. A significant improvement of ductility occurred at the grain size of about 0.4 µm. A further increase in grain size results in a decreased strength and a slightly improved ductility. The alloy with a grain size of about 0.4 µm exhibits an excellent combination of strength and ductility, where the yield strength and tensile elongation are increased up to 738 MPa and 29% as compared to 320 MPa and 33% of a coarse-grained (about 2 µm) sample, respectively. The origin of the excellent mechanical properties was attributed to the unique deformation characteristics associated with the transformation induced plasticity and the development of back stress.
Original languageEnglish
Article number734
JournalMetals
Volume9
Issue number7
Number of pages12
ISSN2075-4701
DOIs
Publication statusPublished - 2019

Keywords

  • Mechanical properties
  • Metastable
  • Back stress
  • Grain size

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