Regularities of microstructure evolution and strengthening mechanisms of austenitic stainless steels subjected to large strain cold working

Andrey Belyakov, Marina Odnobokova, Iaroslava Shakhova, Rustam Kaibyshev

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Citations (Scopus)

Abstract

The deformation microstructures and their effects on mechanical properties of austeniticstainless steels processed by cold rolling at ambient temperature to various total strains were studied. The cold working was accompanied by the development of strain-induced martensitic transformation because of meta-stable austenite at room temperature. The strain-induced martensitic transformation and deformation twinning promoted the grain refinement during cold rolling, leading to nanocrystalline structures consisting of a mixture of austenite and martensite grains with their transverse grain sizes of 50-150 nm containing high dislocation densities. The rolled samples experienced substantial strengthening resulted from high density of strain induced grain/phase boundaries and dislocations. The yield strength of austenitic stainless steels could be increased to 2000 MPa after rolling to total strains of about 4. The martensite and austenite provided almost the same contribution to overall yield strength. The dislocation strengthening was much higher than the grain boundary strengthening at small to moderate strains of about 2, whereas the latter gradually increased approaching the level of dislocation strengthening with increasing the strain.

Original languageEnglish
Title of host publicationTHERMEC 2016
EditorsChristof Sommitsch, Mihail Ionescu, Brajendra Mishra, Brajendra Mishra, Ernst Kozeschnik, T. Chandra
PublisherTrans Tech Publications Ltd
Pages224-229
Number of pages6
ISBN (Print)9783035711295
DOIs
Publication statusPublished - 2017
Externally publishedYes
Event9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016 - Graz, Austria
Duration: 29 May 20163 Jun 2016

Publication series

NameMaterials Science Forum
Volume879
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016
Country/TerritoryAustria
CityGraz
Period29/05/163/06/16

Keywords

  • Austenitic stainless steel
  • Dislocation density
  • Grain refinement
  • Large strain deformation
  • Martensitic transformation
  • Strengthening

Fingerprint

Dive into the research topics of 'Regularities of microstructure evolution and strengthening mechanisms of austenitic stainless steels subjected to large strain cold working'. Together they form a unique fingerprint.

Cite this