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Article: Extraordinary Lüders-strain-rate in medium Mn steels

TitleExtraordinary Lüders-strain-rate in medium Mn steels
Authors
KeywordsMedium Mn steel
Lüders band
Lüders-strain-rate
Dislocation multiplication
Martensitic transformation
Issue Date2019
PublisherElsevier Ltd. The Journal's web site is located at https://www.journals.elsevier.com/materialia
Citation
Materialia, 2019, v. 6, p. article no. 100288 How to Cite?
AbstractAn innovative experimental means based on high-speed digital image correlation (DIC) is employed in this work to investigate the Lüders band formation mechanisms in a medium Mn transformation-induced plasticity (TRIP) steel, allowing precise assessment of local strain rate inside the Lüders band. The stress-controlled instead of conventional strain-controlled mode is adopted during tensile test such that the instantaneous Lüders strain development right under the yield stress can be well captured. A surprisingly high Lüders-strain-rate on the order of 1 s−1 is observed in the tensile test at 25 °C, which is three orders of magnitude above the mean strain rate and about 20 times higher than that obtained in a low-carbon steel. The theoretical analysis shows that the mobile dislocations must be rapidly multiplied so as to support the observed high Lüders-strain-rate. This theoretical viewpoint is confirmed experimentally by transmission electron microscopy (TEM) observations, showing a large number of new dislocations generated in the Lüders band. It is revealed that the martensitic transformation is neither a cause nor a direct effect of Lüders band. Instead, they are two independent events that occur simultaneously. Nevertheless, the martensitic transformation does have the ability to influence a Lüders deformation process when it is involved. It accelerates the Lüders band formation by generating more dislocations and in the meantime raising their velocities, leading to an enhanced Lüders-strain-rate.
Persistent Identifierhttp://hdl.handle.net/10722/290289
ISSN
2020 SCImago Journal Rankings: 0.860
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWANG, XG-
dc.contributor.authorHe, BB-
dc.contributor.authorLIU, CH-
dc.contributor.authorJIANG, C-
dc.contributor.authorHuang, MX-
dc.date.accessioned2020-10-22T08:24:37Z-
dc.date.available2020-10-22T08:24:37Z-
dc.date.issued2019-
dc.identifier.citationMaterialia, 2019, v. 6, p. article no. 100288-
dc.identifier.issn2589-1529-
dc.identifier.urihttp://hdl.handle.net/10722/290289-
dc.description.abstractAn innovative experimental means based on high-speed digital image correlation (DIC) is employed in this work to investigate the Lüders band formation mechanisms in a medium Mn transformation-induced plasticity (TRIP) steel, allowing precise assessment of local strain rate inside the Lüders band. The stress-controlled instead of conventional strain-controlled mode is adopted during tensile test such that the instantaneous Lüders strain development right under the yield stress can be well captured. A surprisingly high Lüders-strain-rate on the order of 1 s−1 is observed in the tensile test at 25 °C, which is three orders of magnitude above the mean strain rate and about 20 times higher than that obtained in a low-carbon steel. The theoretical analysis shows that the mobile dislocations must be rapidly multiplied so as to support the observed high Lüders-strain-rate. This theoretical viewpoint is confirmed experimentally by transmission electron microscopy (TEM) observations, showing a large number of new dislocations generated in the Lüders band. It is revealed that the martensitic transformation is neither a cause nor a direct effect of Lüders band. Instead, they are two independent events that occur simultaneously. Nevertheless, the martensitic transformation does have the ability to influence a Lüders deformation process when it is involved. It accelerates the Lüders band formation by generating more dislocations and in the meantime raising their velocities, leading to an enhanced Lüders-strain-rate.-
dc.languageeng-
dc.publisherElsevier Ltd. The Journal's web site is located at https://www.journals.elsevier.com/materialia-
dc.relation.ispartofMaterialia-
dc.subjectMedium Mn steel-
dc.subjectLüders band-
dc.subjectLüders-strain-rate-
dc.subjectDislocation multiplication-
dc.subjectMartensitic transformation-
dc.titleExtraordinary Lüders-strain-rate in medium Mn steels-
dc.typeArticle-
dc.identifier.emailHuang, MX: mxhuang@hku.hk-
dc.identifier.authorityHuang, MX=rp01418-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.mtla.2019.100288-
dc.identifier.scopuseid_2-s2.0-85062874684-
dc.identifier.hkuros317289-
dc.identifier.volume6-
dc.identifier.spagearticle no. 100288-
dc.identifier.epagearticle no. 100288-
dc.identifier.isiWOS:000536265900032-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl2589-1529-

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