Modeling the microstructure development in gray iron castings
Goettsch, David Douglas
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Permalink
https://hdl.handle.net/2142/20305
Description
Title
Modeling the microstructure development in gray iron castings
Author(s)
Goettsch, David Douglas
Issue Date
1991
Doctoral Committee Chair(s)
Dantzig, Jonathan A.
Department of Study
Mechanical Science and Engineering
Discipline
Mechanical Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Engineering, Metallurgy
Engineering, Materials Science
Language
eng
Abstract
Recent years have seen increasing use of solidification process modeling as a tool to aid in the analysis and elimination of manufacturing defects in castings. Grain size and other microstructural features such as second phase morphology and distribution are the primary factors in determining the mechanical properties in cast metals. In this work, a representation of nucleation and growth kinetics for gray cast irons, based on a statistical description of the microstructure, has been coupled with a commercial finite element method code for transient heat flow calculation to determine microstructure. Features predicted include eutectic cell size, fractions of gray and white iron, graphite morphology, percent pearlite, percent ferrite and pearlite spacing. The predicted microstructure can then he used to determine the strength and fatigue properties using published correlations. This model will provide a powerful tool in optimizing casting and design parameters of a component. The theoretical development and results of the finite element based model will be discussed and compared with experimental results.
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