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Article: The role of martensitic transformation on bimodal grain structure in ultrafine grained AISI 304L stainless steel
Title | The role of martensitic transformation on bimodal grain structure in ultrafine grained AISI 304L stainless steel |
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Authors | |
Keywords | Austenitic stainless steel Bimodal grain size distribution Dislocation cell type martensite Lath type martensite Nanoindentation Reversion mechanism |
Issue Date | 2015 |
Publisher | Elsevier 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? |
Abstract | In 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 Identifier | http://hdl.handle.net/10722/211538 |
ISSN | 2023 Impact Factor: 6.1 2023 SCImago Journal Rankings: 1.660 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Sabooni, S | - |
dc.contributor.author | Karimzadeh, F | - |
dc.contributor.author | Enayati, MH | - |
dc.contributor.author | Ngan, AHW | - |
dc.date.accessioned | 2015-07-16T08:13:27Z | - |
dc.date.available | 2015-07-16T08:13:27Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2015, v. 636, p. 221-230 | - |
dc.identifier.issn | 0921-5093 | - |
dc.identifier.uri | http://hdl.handle.net/10722/211538 | - |
dc.description.abstract | In 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.language | eng | - |
dc.publisher | Elsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/msea | - |
dc.relation.ispartof | Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License | - |
dc.subject | Austenitic stainless steel | - |
dc.subject | Bimodal grain size distribution | - |
dc.subject | Dislocation cell type martensite | - |
dc.subject | Lath type martensite | - |
dc.subject | Nanoindentation | - |
dc.subject | Reversion mechanism | - |
dc.title | The role of martensitic transformation on bimodal grain structure in ultrafine grained AISI 304L stainless steel | - |
dc.type | Article | - |
dc.identifier.email | Ngan, AHW: hwngan@hku.hk | - |
dc.identifier.authority | Ngan, AHW=rp00225 | - |
dc.description.nature | postprint | - |
dc.identifier.doi | 10.1016/j.msea.2015.03.101 | - |
dc.identifier.scopus | eid_2-s2.0-84927729872 | - |
dc.identifier.hkuros | 244363 | - |
dc.identifier.volume | 636 | - |
dc.identifier.spage | 221 | - |
dc.identifier.epage | 230 | - |
dc.identifier.isi | WOS:000355886100028 | - |
dc.publisher.place | Switzerland | - |
dc.identifier.issnl | 0921-5093 | - |