Effect of carbon on α′→γ reversion of metastable austenitic stainless steels

Kouki Tomimura, Manabu Oku, Setsuo Takaki, Youichi Tokunaga

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Abstract

The effects of carbon on reversion behavior of metastable austenitic stainless steel were investigated using a 16.2% Cr- 8.8% Ni- 0.11% C steel. The steel used almost transforms to lath martensite (α′) from austenite (γ) by 90% cold rolling. The steel completely reverses on 923 K-10s annealing. However, isothermal α′ is produced on subsequent aging at room temperature (290 K) in case of more than 0.1 ks in 923 K isothermal annealing, and at 900 K and above in 0.6 ks isochronal annealing. In 923 K annealing, carbide precipitation occurred in preference to reversion. The carbide tends to retard a martensitic reversion and accelerated a diffusional reversion inversely. The grain size of γ reversed by a diffusional reversion at 923 K annealing is 0.2 μm dia. The carbide is effective for refining the grain by reversion.

Original languageEnglish
Pages (from-to)1186-1192
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume75
Issue number7
DOIs
Publication statusPublished - Jan 1 1989

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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