Effect of large strain cold rolling and subsequent annealing on microstructure and mechanical properties of an austenitic stainless steel

I. Shakhova, V. Dudko, A. Belyakov, K. Tsuzaki, R. Kaibyshev

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113 Citations (Scopus)

Abstract

The microstructural evolution of an S304H steel during bar rolling to a strain of 4 and subsequent annealing as well as its effect on the mechanical properties were investigated. The cold working was accompanied by a strain-induced martensitic transformation, leading to the development of lamellar-type microstructure consisting of highly elongated austenite/ferrite subgrains with a mean transverse size of approximately 50. nm; the austenite volume fraction was approximately 0.35. This material exhibited a yield strength above 2000. MPa. The subsequent annealing resulted in grain coarsening following the ferrite → austenite reversion, which led to almost full austenitization at temperatures above 700 °C. The formation of the austenite/ferrite lamellar structure that mixed with separate equiaxed grains occurred after annealing at temperatures of T≤ 700 °C. The grain coarsening was accompanied by a degradation in strength, although the yield strength of above 1000. MPa remained after 2. h of annealing at 700 °C. The discontinuous recrystallization of austenite resulted in the development of a relatively coarse-grained microstructure at T≥ 800 °C.

Original languageEnglish
Pages (from-to)176-186
Number of pages11
JournalMaterials Science and Engineering A
Volume545
DOIs
Publication statusPublished - May 30 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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