Effect of Chemistry on the Transformation of Austenite to Martensite for Intercritically Austempered Ductile Iron

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dc.contributor.authorBanerjee, Sayantien
dc.contributor.committeechairDruschitz, Alan P.en
dc.contributor.committeememberDowling, Norman E.en
dc.contributor.committeememberHunter, Jerry L.en
dc.contributor.committeememberReynolds, William T. Jr.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2013-02-19T22:41:13Zen
dc.date.available2013-02-19T22:41:13Zen
dc.date.issued2013-01-11en
dc.description.abstractIntercritically austempered ductile iron (IADI) with a matrix microstructure of ferrite plus metastable austenite has an excellent combination of strength and toughness. The high strength and good ductility of this material is due to the transformation of metastable austenite to martensite during deformation. In the present study, the transformation of austenite to martensite for intercritically austempered ductile irons of varying alloy chemistry (varying amounts of nickel and/or manganese) were examined using in-situ neutron diffraction under strain-controlled loading at VULCAN at the Spallation Neutron Source at Oak Ridge National Laboratory (ORNL). Both diffraction and tensile data were collected and synced using the VDRIVE software (a proprietary ORNL software package). The single peak fit method was employed in the analysis of the diffraction data. In this thesis, the stress and strain for the start of the transformation of metastable austenite to martensite were determined. The development of residual stresses during deformation and the elastic diffraction constants for both the ferrite and austenite phases were also determined. The material was characterized using optical microscopy, backscattered imaging in the scanning electron microscopy, energy dispersive spectroscopy and transmission electron microscopy.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:156en
dc.identifier.urihttp://hdl.handle.net/10919/19258en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectmartensitic transformationen
dc.subjectcritical stressen
dc.subjectneutron diffractionen
dc.subjectductile ironen
dc.subjectintercritical heat treatmenten
dc.subjectlattice strainen
dc.subjectdien
dc.titleEffect of Chemistry on the Transformation of Austenite to Martensite for Intercritically Austempered Ductile Ironen
dc.typeThesisen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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