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Conference Paper: Effect of free surface on martensitic transformation in individual retained austenite grains

TitleEffect of free surface on martensitic transformation in individual retained austenite grains
Authors
Huang, MHe, BVan der Zwaag, S
Issue Date2015
Citation
The 2015 International Conference on Solid-Solid Phase Transformation in Inorganic Materials (PTM 2015), Whistler, BC., Canada, 28 June-3 July 2015. How to Cite?
AbstractThe stability of retained austenite depends on the chemical composition, morphology, grain size and hardness of the surrounding matrix. Different to these aspects, the present work explores the effect of free surface on the stability of retained austenite. The first part is to employ FIB milling to create free surface around individual retained austenite grains. It was found that martensitic transformation took place automatically in the retained austenite grain when a free surface was introduced, without applying external stress. This is due to the fact that the martensite nucleation energy barrier can be lowered as the strain energy induced by martensitic transformation is largely lowered when the matrix constraints were removed. The second part investigates martensitic transformation in micron-sized pillars which were fabricated by FIB from individual retained austenite grains. It was found that that α’-martensite formed in micron-sized pillars was nearly dislocation free due to the free surface effect.
DescriptionOral presentation: M Huang - Session: Martensitic & Bainitic Transformations in Steels 1 (Invited)
The Conference program and abstracts' website is located at http://www.ptm2015.org/
Persistent Identifierhttp://hdl.handle.net/10722/214847

 

DC FieldValueLanguage
dc.contributor.authorHuang, M-
dc.contributor.authorHe, B-
dc.contributor.authorVan der Zwaag, S-
dc.date.accessioned2015-08-21T11:58:28Z-
dc.date.available2015-08-21T11:58:28Z-
dc.date.issued2015-
dc.identifier.citationThe 2015 International Conference on Solid-Solid Phase Transformation in Inorganic Materials (PTM 2015), Whistler, BC., Canada, 28 June-3 July 2015.-
dc.identifier.urihttp://hdl.handle.net/10722/214847-
dc.descriptionOral presentation: M Huang - Session: Martensitic & Bainitic Transformations in Steels 1 (Invited)-
dc.descriptionThe Conference program and abstracts' website is located at http://www.ptm2015.org/-
dc.description.abstractThe stability of retained austenite depends on the chemical composition, morphology, grain size and hardness of the surrounding matrix. Different to these aspects, the present work explores the effect of free surface on the stability of retained austenite. The first part is to employ FIB milling to create free surface around individual retained austenite grains. It was found that martensitic transformation took place automatically in the retained austenite grain when a free surface was introduced, without applying external stress. This is due to the fact that the martensite nucleation energy barrier can be lowered as the strain energy induced by martensitic transformation is largely lowered when the matrix constraints were removed. The second part investigates martensitic transformation in micron-sized pillars which were fabricated by FIB from individual retained austenite grains. It was found that that α’-martensite formed in micron-sized pillars was nearly dislocation free due to the free surface effect.-
dc.languageeng-
dc.relation.ispartofInternational Conference on Solid-Solid Phase Transformation in Inorganic Materials, PTM 2015-
dc.titleEffect of free surface on martensitic transformation in individual retained austenite grains-
dc.typeConference_Paper-
dc.identifier.emailHuang, M: mxhuang@hku.hk-
dc.identifier.authorityHuang, M=rp01418-
dc.identifier.hkuros247614-
dc.identifier.hkuros247613-

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