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Article: Abnormal TRIP effect on the work hardening behavior of a quenching and partitioning steel at high strain rate

TitleAbnormal TRIP effect on the work hardening behavior of a quenching and partitioning steel at high strain rate
Authors
KeywordsTRIP effect
Dislocation density
Q&P steel
Martensitic transformation
High strain rate
Issue Date2020
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat
Citation
Acta Materialia, 2020, v. 188, p. 551-559 How to Cite?
AbstractQuenching and partitioning (Q&P) steels possess high strength and good ductility because of the transformation of metastable austenite to martensite, which is referred to transformation-induced plasticity (TRIP) effect. In literature, TRIP effect generally results in an enhancement of work hardening rate during tensile test. Nevertheless, the present work observes an abnormal TRIP effect in a 1500 MPa Q&P steel. Although a considerable amount of retained austenite transformed to martensite during the tensile test at a strain rate of 1000 s − 1, no obvious enhancement of work hardening rate was observed. To explore the underlying mechanisms for such an abnormal TRIP effect, the evolution of dislocation density and martensitic transformation were characterized by synchrotron X-ray diffraction and electron microscopy. Comparing the quasi-static and high-strain-rate results, it is found that the dislocation density in the martensite matrix is suppressed at 1000 s − 1, resulting in a lower work hardening. Furthermore, the transformed martensite deforms plastically at 1000 s − 1. Without the composite-like deformation behavior (elastically in hard transformed martensite and plastically in soft martensite matrix), the corresponding work hardening is reduced.
Persistent Identifierhttp://hdl.handle.net/10722/289747
ISSN
2019 Impact Factor: 7.656
2015 SCImago Journal Rankings: 3.683

 

DC FieldValueLanguage
dc.contributor.authorWANG, M-
dc.contributor.authorHuang, MX-
dc.date.accessioned2020-10-22T08:16:53Z-
dc.date.available2020-10-22T08:16:53Z-
dc.date.issued2020-
dc.identifier.citationActa Materialia, 2020, v. 188, p. 551-559-
dc.identifier.issn1359-6454-
dc.identifier.urihttp://hdl.handle.net/10722/289747-
dc.description.abstractQuenching and partitioning (Q&P) steels possess high strength and good ductility because of the transformation of metastable austenite to martensite, which is referred to transformation-induced plasticity (TRIP) effect. In literature, TRIP effect generally results in an enhancement of work hardening rate during tensile test. Nevertheless, the present work observes an abnormal TRIP effect in a 1500 MPa Q&P steel. Although a considerable amount of retained austenite transformed to martensite during the tensile test at a strain rate of 1000 s − 1, no obvious enhancement of work hardening rate was observed. To explore the underlying mechanisms for such an abnormal TRIP effect, the evolution of dislocation density and martensitic transformation were characterized by synchrotron X-ray diffraction and electron microscopy. Comparing the quasi-static and high-strain-rate results, it is found that the dislocation density in the martensite matrix is suppressed at 1000 s − 1, resulting in a lower work hardening. Furthermore, the transformed martensite deforms plastically at 1000 s − 1. Without the composite-like deformation behavior (elastically in hard transformed martensite and plastically in soft martensite matrix), the corresponding work hardening is reduced.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat-
dc.relation.ispartofActa Materialia-
dc.subjectTRIP effect-
dc.subjectDislocation density-
dc.subjectQ&P steel-
dc.subjectMartensitic transformation-
dc.subjectHigh strain rate-
dc.titleAbnormal TRIP effect on the work hardening behavior of a quenching and partitioning steel at high strain rate-
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.actamat.2020.02.035-
dc.identifier.scopuseid_2-s2.0-85080037317-
dc.identifier.hkuros317271-
dc.identifier.volume188-
dc.identifier.spage551-
dc.identifier.epage559-
dc.publisher.placeUnited Kingdom-

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