Ultrafine grain evolution in austenitic stainless steel during large strain deformation and subsequent annealing

Andrey Belyakov, Kaneaki Tsuzaki, Rustam Kaibyshev

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The structural changes in a 304-type austenitic stainless steel during large strain cold rolling and subsequent annealing were studied. The severe deformation resulted in the development of highly elongated grains/subgrains aligned along the rolling axis. The transverse grain/subgrain size rapidly decreased to its minimal value of about 50 nm at relatively small strains of ∼1 and then hardly changed upon following deformation. Such a structural response on cold working was associated with multiple twinning resulting in fast grain subdivision. The processing was accompanied by a partial martensitic transformation resulting in a decrease of austenite volume fraction to about 0.35 after straining to ε?= 4.0. Isochronal annealing for 30 min was characterised by a gradual coarsening of grains, the average size of which increased to about 200 nm after heating to 800°C. The high elongation of ferrite grains facilitated simultaneous homogeneous nucleation of austenite grains throughout the matrix upon heating; and, therefore, promoted the development of ultrafine grained structure with the size of structural elements well below 1 micron.

Original languageEnglish
Title of host publicationRecrystallization and Grain Growth IV
Pages273-278
Number of pages6
DOIs
Publication statusPublished - May 14 2012
Externally publishedYes
Event4th International Conference on Recrystallization and Grain Growth, ReX and GG IV - Sheffield, United Kingdom
Duration: Jul 4 2010Jul 9 2010

Publication series

NameMaterials Science Forum
Volume715-716
ISSN (Print)0255-5476

Other

Other4th International Conference on Recrystallization and Grain Growth, ReX and GG IV
CountryUnited Kingdom
CitySheffield
Period7/4/107/9/10

All Science Journal Classification (ASJC) codes

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

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