{"65837":{"#nid":"65837","#data":{"type":"event","title":"MSE Ph.D. Thesis Defense \u2013 Liang Quan","body":[{"value":"\u003Cp\u003EThesis Title: USING FDM AND FEM TO SIMULATE THE\nDECARBURIZATION IN AISI 1074 DURING HEAT PROCESSING AND ITS IMPACT \u003C\/p\u003E\n\n\n\n\u003Cp\u003EAbstract:\u0026nbsp; The\nscience of metallurgy has a history almost as long as human civilization\nitself. A great variety of metals and metallic alloys at different stages have\nbecome the very cornerstone on which our society is based, since the inception\nof this ancient yet vibrant discipline. \u003C\/p\u003E\n\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; However,\ncomputational metallurgical mechanics remains elusive largely owing to the\ndisconnect between the modern computational approaches and the complexity of\nmost metallurgical topics. Just tapping into one of the most discussed\nmetallurgical phenomena, decarburization, the work presented in this thesis\nsummarizes the research conducted on quantifying the progression of\ndecarburization and its impact on the mechanical properties of steel samples.\u003C\/p\u003E\n\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; The\ntopics researched in this work serve, but are not limited to, the production of\nhollow metal proppants used for underground oil and natural gas reserve\nextraction, including calculating the progression and the impact of\ndecarburization that occurs during the heat processing of steel in a\ntime-dependent fashion and modeling the deformation behavior of a maraging\nsteel hollow sphere. Then the decarburization model is modified to relate the\noverall mechanical properties of the impact-resistant\nMg\/Al\/maraging-steel-hollow-sphere composite material to its microstructure. \u003C\/p\u003E\n\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; As\nmuch as 95% by weight of all metal produced worldwide is steel. In order to\nobtain higher strength and eliminate residual stress, steel is heated to high\ntemperatures to allow for homogenization followed by heat treating at a variety\nof temperatures and times to enhance the overall mechanical properties.\nHowever, decarburization, commonly known as the loss of carbon to the\nenvironment due to\u0026nbsp; its reaction with the atmosphere, will occur and\nresult in considerable strength loss. To avoid potential dangers such as\nreduced static and fatigue properties, the mechanical property variations must\nbe determined with respect to the heat treatment temperature and time. This\nwork also outlines the procedures used to quantify the effects of processing\ntemperature on the microstructure. These effects include average particle size,\nparticle volume fraction, void and porosity. Once completed, the deformation\nbehavior of the maraging steel hollow spheres is investigated in the subsequent\nwork to visualize the stress environment in which the proppants would function.\nTo further the effort, the hollow maraging steel spheres are cast into Mg\/Al\nalloy matrix and the properties of the resulted impact-resistant composite\nmaterial are simulated loosely based on the microstructure model established\nfor the decarburization process. \u003C\/p\u003E\n\n\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; Modeling\nmakes it economically practical to assess the targeted materials\u0027 overall\nproperties, behaviors and the mechanical responses in conjunction with stress\nenvironment, material dimensions (sphere size, sphere wall thickness, etc.)\namong other variables, before a structure is built. Additionally, more advanced\nmodeling can enable the quantitative descriptions of more complex metallurgical\nphenomena such as the effects of impurity elements, geometric changes of the\nsecond-phase particles, and deformation under complex loading situations.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EUSING FDM AND FEM TO SIMULATE THE\nDECARBURIZATION IN AISI 1074 DURING HEAT PROCESSING AND ITS IMPACT \u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"MSE Ph.D. Thesis Defense \u2013 Liang Quan"}],"uid":"27388","created_gmt":"2011-04-28 12:35:50","changed_gmt":"2016-10-08 01:54:54","author":"Bill Miller","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2011-05-11T12:00:00-04:00","event_time_end":"2011-05-11T14:00:00-04:00","event_time_end_last":"2011-05-11T14:00:00-04:00","gmt_time_start":"2011-05-11 16:00:00","gmt_time_end":"2011-05-11 18:00:00","gmt_time_end_last":"2011-05-11 18:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1238","name":"School of Materials Science and Engineering"},{"id":"61312","name":"MSE Seminars"}],"categories":[],"keywords":[{"id":"10802","name":"MSE_Interal_Event"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1789","name":"Conference\/Symposium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}