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Microstructure characterization of 316L deformed at high strain rates using EBSD
Dalarna University, School of Technology and Business Studies, Materials Technology. (Tribologi)ORCID iD: 0000-0002-4359-4967
Dalarna University, School of Technology and Business Studies, Materials Technology.
2016 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 122, 14-21 p.Article in journal (Refereed) Published
Abstract [en]

Specimens from split Hopkinson pressure bar experiments, at strain rates between ~ 1000–9000 s− 1 at room temperature and 500 °C, have been studied using electron backscatter diffraction. No significant differences in the microstructures were observed at different strain rates, but were observed for different strains and temperatures. Size distribution for subgrains with boundary misorientations > 2° can be described as a bimodal lognormal area distribution. The distributions were found to change due to deformation. Part of the distribution describing the large subgrains decreased while the distribution for the small subgrains increased. This is in accordance with deformation being heterogeneous and successively spreading into the undeformed part of individual grains. The variation of the average size for the small subgrain distribution varies with strain but not with strain rate in the tested interval. The mean free distance for dislocation slip, interpreted here as the average size of the distribution of small subgrains, displays a variation with plastic strain which is in accordance with the different stages in the stress-strain curves. The rate of deformation hardening in the linear hardening range is accurately calculated using the variation of the small subgrain size with strain.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 122, 14-21 p.
Keyword [en]
Austenitic stainless steels, EBSD, High strain rate, Grain size distribution, Strain hardening
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-23303DOI: 10.1016/j.matchar.2016.10.017OAI: oai:DiVA.org:du-23303DiVA: diva2:1043726
Available from: 2016-10-31 Created: 2016-10-31 Last updated: 2016-11-18Bibliographically approved

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