Effect of grain size on thermal and mechanical stability of austenite in metastable austenitic stainless steel

Yoshikazu Matsuoka, Tatsuya Iwasaki, Nobuo Nakada, Toshihiro Tsuchiyama, Setsuo Takaki

    Research output: Contribution to journalArticlepeer-review

    136 Citations (Scopus)

    Abstract

    In order to clarify the grain size dependence of mechanical stability of austenite, deformation-induced martensitic transformation behavior was investigated on uniaxial tensile deformation in a metastable austenitic stainless steel (Fe-16%Cr-10%Ni) with the grain size controlled from 1 to 80 μ m. In addition, crystallographic characteristics of deformation-induced martensite were analyzed by means of the EBSD (electron backscattering diffraction) method to discuss the variant selection rule. It was found that mechanical stability of austenite is independent of its grain size, although thermal stability of austenite is remarkably increased by grain refinement. Some special martensite variants tend to be selected in an austenite grain on the deformation-induced martensitic transformation (near single-variant transformation), and this results in the formation of a texture along tensile direction. This suggests that the most advantageous variants are selected in the deformation-induced martensitic transformation to release tensile strain and leads to the grain size independence of mechanical stability of austenite.

    Original languageEnglish
    Pages (from-to)1224-1230
    Number of pages7
    Journalisij international
    Volume53
    Issue number7
    DOIs
    Publication statusPublished - 2013

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

    Fingerprint

    Dive into the research topics of 'Effect of grain size on thermal and mechanical stability of austenite in metastable austenitic stainless steel'. Together they form a unique fingerprint.

    Cite this