{"63311":{"#nid":"63311","#data":{"type":"event","title":"Ranbir Singh Jamwal - PhD Proposal Defense","body":[{"value":"\u003Cp\u003EThesis Title: Microstructural Origins of Variability in\nthe Tensile Ductility of dual phase steels\u003C\/p\u003E\n\n\n\n\u003Cp\u003EAbstract:\u003C\/p\u003E\u003Cp\u003EQuantitative relationships among processing parameters, microstructure,\nand material properties are of considerable interest in the context of\ndevelopment of robust processing routes that optimize the required material\nproperties. As a result, the scientific literature contains a large number of\nexperimental and theoretical studies on microstructure-properties\nrelationships. Fracture sensitive mechanical properties such as ductility,\nultimate tensile strength, fatigue life, and fracture toughness depend on the\naverage microstructural parameters as well as the distributions of\nmicrostructural parameters and their extrema.Development of quantitative\nrelationships between such material properties and microstructural\ndistributions and extrema has received considerably less attention,\nparticularly in the wrought metals and alloys. Accordingly, an important\nobjective of this research is to perform a systematic investigation in this\ndirection. \u003C\/p\u003E\n\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; The\ndependence of the fracture-sensitive mechanical properties on the\nmicrostructural distributions and extrema often leads to substantial\nvariability in these properties: a set of specimens having the same average\nchemistry, the same average processing history, and the same average\nmicrostructural parameters such as volume fractions of different constituents\ncan exhibit substantially different material properties. The present\nresearch\u0026nbsp; (i) is concerned with high\nstrength (~ 1000 MPa) high martensite (\u0026gt;50%) dual phase steel where the\nmartensite is a topologically continuous phase (matrix) containing a dispersion\nof islands of ferrite, and (ii) focuses\u0026nbsp;\non understanding the microstructural origins of the variability in\nfracture sensitive mechanical properties, in particular variability in the room\ntemperature uniaxial tensile ductility. The research involves quantitative\nmicrostructure characterization using stereology and digital image processing\nand quantitative fractography using scanning electron microscopy (SEM) and\nfracture profilometry. The analysis of the quantitative fractographic and\nmicrostructural data obtained in this research leads to useful guidelines for\nreducing the variability in the tensile ductility of the dual phase steel under\ninvestigation. \u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003ERanbir Singh Jamwal - PhD Proposal Defense - Thesis Title: Microstructural Origins of Variability in\nthe Tensile Ductility of dual phase steels \u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Ranbir Singh Jamwal - PhD Proposal Defense"}],"uid":"27388","created_gmt":"2011-01-03 10:10:48","changed_gmt":"2016-10-08 01:53:40","author":"Bill Miller","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2011-01-05T14:00:00-05:00","event_time_end":"2011-01-05T17:00:00-05:00","event_time_end_last":"2011-01-05T17:00:00-05:00","gmt_time_start":"2011-01-05 19:00:00","gmt_time_end":"2011-01-05 22:00:00","gmt_time_end_last":"2011-01-05 22:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1238","name":"School of Materials Science and Engineering"}],"categories":[],"keywords":[{"id":"10802","name":"MSE_Interal_Event"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Ca href=\u0022mailto:rjamwal3@gatech.edu\u0022\u003Erjamwal3@gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}