Date of Award
Mechanical, Automotive, and Materials Engineering
Watt, D. F.,
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In the present work, a two dimensional numerical model was established for resistance welded crossed bars which include a heat-affected zone. A post-weld heating algorithm was developed to predict the thermal history of the heat-affected zone during the cooling stage. The heat diffusion equation was solved using an explicit finite-difference method. Temperature dependent thermal conductivity, heat capacities, and electrical resistivity were considered. An empirical grain growth equation was derived from Jominy test to predict the initial temperature contour in the heat-affected zone at the end of welding current input. An algorithm based on the hardenability work of Kirkaldy and coworkers has been modified to fit the resistance welded high carbon plain carbon steel bars. Isothermal transformation diagrams were also computed. Using the time-temperature history at each node in the weld region, and the modified kinetics algorithm, the rate and extent of the decomposition of austenite into its daughter products ferrite, pearlite, bainite and martensite in the welded bars were calculated. The austenite grain size incorporated into the modified kinetics algorithm changed with the position in the heat-affected zone. Experimental observation of microstructures in the welded bars was carried out. The algorithm was found to be in agreement with experimental results.Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1992 .P357. Source: Masters Abstracts International, Volume: 31-03, page: 1362. Supervisor: D. F. Watt. Thesis (M.A.Sc.)--University of Windsor (Canada), 1991.
Pan, Rong., "Modelling weld microstructure development in resistance welded crossed bars." (1991). Electronic Theses and Dissertations. 2765.