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Plastic yielding in lath martensites – An alternative viewpoint
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
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2018 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 152, p. 239-247Article in journal (Refereed) Published
Abstract [en]

In recent literature the gradual yielding of quenched martensitic steels has been attributed to either heterogeneous microstructures having different strength levels or to the presence of small scale, Type II, residual stresses. Using in-situ tensile testing in synchrotron diffraction experiments in combination with crystal plasticity finite element modelling (CPFEM) we show that the dominant influence on yielding derives from the residual stresses which are a product of the displacive transformation from austenite during quenching. As plastic straining proceeds, the measured diffraction peaks become narrower and asymmetric, as predicted by the CPFEM calculations. The model predictions are generally in good agreement with published results showing large variations in local strains in different microstructural elements.

Place, publisher, year, edition, pages
2018. Vol. 152, p. 239-247
Keywords [en]
Diffraction, Martensite, Modelling, Residual stress, Yielding, Finite element method, Martensitic transformations, Models, Residual stresses, Tensile testing, Crystal plasticity finite element, Diffraction peaks, Displacive transformation, Heterogeneous microstructure, In-situ tensile testing, Microstructural elements, Synchrotron diffraction, Plasticity testing
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33961DOI: 10.1016/j.actamat.2018.04.039Scopus ID: 2-s2.0-85046071224OAI: oai:DiVA.org:ri-33961DiVA, id: diva2:1230407
Note

Funding details: Deakin University; Funding details: MIT, Massachusetts Institute of Technology; Funding details: Australian Synchrotron;

Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2018-07-03Bibliographically approved

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