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Article: The role of martensitic transformation on bimodal grain structure in ultrafine grained AISI 304L stainless steel

TitleThe role of martensitic transformation on bimodal grain structure in ultrafine grained AISI 304L stainless steel
Authors
Issue Date2015
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/msea
Citation
Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2015, v. 636, p. 221-230 How to Cite?
AbstractIn the present study, metastable AISI 304L austenitic stainless steel samples were subjected to different cold rolling reductions from 70% to 93%, followed by annealing at 700 °C for 300 min to form ultrafine grained (UFG) austenite with different grain structures. Transmission electron microscopy (TEM) and nanoindentation were used to characterize the martensitic transformation, in order to relate it to the bimodal distribution of the austenite grain size after subsequent annealing. The results showed that the martensite morphology changed from lath type in the 60% rolled sample to a mixture of lath and dislocation-cell types in the higher rolling reductions. Calculation of the Gibbs free energy change during the reversion treatment showed that the reversion mechanism is shear controlled at the annealing temperature and so the morphology of the reverted austenite is completely dependent on the morphology of the deformation induced martensite. It was found that the austenite had a bimodal grain size distribution in the 80% rolled and annealed state and this is related to the existence of different types of martensite. Increasing the rolling reduction to 93% followed by annealing caused changing of the grain structure to a monomodal like structure, which was mostly covered with small grains of around 300 nm. The existence of bimodal austenite grain size in the 80% rolled and annealed 304L stainless steel led to the improvement of ductility while maintaining a high tensile strength in comparison with the 93% rolled and annealed sample.
Persistent Identifierhttp://hdl.handle.net/10722/211538
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.803

 

DC FieldValueLanguage
dc.contributor.authorSabooni, S-
dc.contributor.authorKarimzadeh, F-
dc.contributor.authorEnayati, MH-
dc.contributor.authorNgan, AHW-
dc.date.accessioned2015-07-16T08:13:27Z-
dc.date.available2015-07-16T08:13:27Z-
dc.date.issued2015-
dc.identifier.citationMaterials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2015, v. 636, p. 221-230-
dc.identifier.issn0921-5093-
dc.identifier.urihttp://hdl.handle.net/10722/211538-
dc.description.abstractIn the present study, metastable AISI 304L austenitic stainless steel samples were subjected to different cold rolling reductions from 70% to 93%, followed by annealing at 700 °C for 300 min to form ultrafine grained (UFG) austenite with different grain structures. Transmission electron microscopy (TEM) and nanoindentation were used to characterize the martensitic transformation, in order to relate it to the bimodal distribution of the austenite grain size after subsequent annealing. The results showed that the martensite morphology changed from lath type in the 60% rolled sample to a mixture of lath and dislocation-cell types in the higher rolling reductions. Calculation of the Gibbs free energy change during the reversion treatment showed that the reversion mechanism is shear controlled at the annealing temperature and so the morphology of the reverted austenite is completely dependent on the morphology of the deformation induced martensite. It was found that the austenite had a bimodal grain size distribution in the 80% rolled and annealed state and this is related to the existence of different types of martensite. Increasing the rolling reduction to 93% followed by annealing caused changing of the grain structure to a monomodal like structure, which was mostly covered with small grains of around 300 nm. The existence of bimodal austenite grain size in the 80% rolled and annealed 304L stainless steel led to the improvement of ductility while maintaining a high tensile strength in comparison with the 93% rolled and annealed sample.-
dc.languageeng-
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/msea-
dc.relation.ispartofMaterials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing-
dc.titleThe role of martensitic transformation on bimodal grain structure in ultrafine grained AISI 304L stainless steel-
dc.typeArticle-
dc.identifier.emailNgan, AHW: hwngan@hku.hk-
dc.identifier.authorityNgan, AHW=rp00225-
dc.identifier.doi10.1016/j.msea.2015.03.101-
dc.identifier.hkuros244363-
dc.identifier.volume636-
dc.identifier.spage221-
dc.identifier.epage230-
dc.publisher.placeSwitzerland-

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