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EBSD analysis of surface and bulk microstructure evolution during interrupted tensile testing of a Fe-19Cr-12Ni alloy
Dalarna University, School of Technology and Business Studies, Materials Technology.ORCID iD: 0000-0002-4359-4967
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2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 141, p. 8-18Article in journal (Refereed) Published
Abstract [en]

Abstract The microstructure evolution in both surface and bulk grains in a pure Fe-19Cr-12Ni alloy has been analyzed using electron backscatter diffraction after tensile testing interrupted at different strains. Surface grains were studied during in situ tensile testing performed in a scanning electron microscope, whereas bulk grains were studied after conventional tensile testing. The evolution of the deformation structure in surface and bulk grains displays a strong resemblance but the strain needed to obtain a similar deformation structure is lower in the case of surface grains. Both slip and twinning are observed to be important deformation mechanisms, whereas deformation-induced martensite formation is of minor importance. Since the stacking fault energy (SFE) is low, 17mJ/m2, dynamic recovery by cross slip of un-dissociated dislocations is unfavorable. This reduces the annihilation of dislocations which in turn leads to a significant increase of low angle boundaries with increasing strain. The low SFE also favors formation of deformation twins which reduces the slip distance, leading to a hardening similar to the Hall-Petch relation. The combination of a low ability for cross-slip and a reduced slip distance caused by twinning is concluded to be the main reason for maintaining a high strain-hardening rate up to strains close to necking.

Place, publisher, year, edition, pages
2018. Vol. 141, p. 8-18
Keywords [en]
Austenitic stainless steels, Electron backscatter diffraction (EBSD), In situ tension test, Grain boundaries, Grain rotation
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-27537DOI: 10.1016/j.matchar.2018.04.035ISI: 000435428100002Scopus ID: 2-s2.0-85046128454OAI: oai:DiVA.org:du-27537DiVA, id: diva2:1202215
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Open Access APC beslut 12/2018

Available from: 2018-04-27 Created: 2018-04-27 Last updated: 2018-07-05Bibliographically approved

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Yvell, KarinEngberg, Göran

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