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Stacking fault energies in austenitic stainless steels
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2837-3656
Sandvik Coromant RandD, Sweden.
Sandvik Mat Technology, Sweden.
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2016 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 111, 39-46 p.Article in journal (Refereed) PublishedText
Abstract [en]

We measure the stacking fault energy of a set of 20 at% Cr-austenitic stainless steels by means of transmission electron microscopy using the weak beam dark field imaging technique and the isolated dislocations method. The measurements are analyzed together with first principles calculations. The results show that experiment and theory agree very well for the investigated concentration range of Mn (0-8%) and Ni (11-30%). The calculations show that simultaneous relaxation of atomic and spin degrees of freedom is important in order to find the, global energy minimum for these materials. Our results clearly show the great potential of the weak beam dark field technique to obtain accurate measurements of the stacking fault energy of austenitic steels and that the reliable predictability of first principles calculations can be used to design new steels with optimized mechanical properties. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2016. Vol. 111, 39-46 p.
Keyword [en]
Stacking fault energy; Austenitic steel; Plasticity; Transmission electron microscopy; Density functional theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-128922DOI: 10.1016/j.actamat.2016.03.042ISI: 000375812100005OAI: oai:DiVA.org:liu-128922DiVA: diva2:934984
Note

Funding Agencies|Swedish Research Council Linkoping Linnaeus Initiative LiLi-NFM [2008-6572]; Swedish Government Strategic Faculty Grant in Materials Science at Linkoping University (SFO Mat-LiU/AFM); Sandvik AB; Swedish Research Council; Swedish Foundation for Strategic Research; Chinese Scholarship Council; Knut and Alice Wallenberg Foundation

Available from: 2016-06-09 Created: 2016-06-07 Last updated: 2016-08-31

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Lu, JunHultman, Lars
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