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Stacking fault energies in austenitic stainless steels
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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.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 111, 39-46 p.
Keyword [en]
Austenitic steel, Density functional theory, Plasticity, Stacking fault energy, Transmission electron microscopy, Austenite, Austenitic stainless steel, Calculations, Degrees of freedom (mechanics), Electron microscopy, High resolution transmission electron microscopy, Imaging techniques, Manganese, Stacking faults, Accurate measurement, Concentration ranges, Dark field, Dark field imaging, First-principles calculation, Global energy minima, Spin degrees of freedom, Stacking fault energies, Stainless steel
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-186952DOI: 10.1016/j.actamat.2016.03.042ISI: 000375812100005ScopusID: 2-s2.0-84961578433OAI: diva2:930166
Swedish Research Council

QC 20160523

Available from: 2016-05-23 Created: 2016-05-16 Last updated: 2016-06-09Bibliographically approved

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Vitos, Levente
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Applied Material Physics
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