Modeling the microstructure development in gray iron castings

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Goettsch, David Douglas

Contributors dc:contributor

• Dantzig, Jonathan A.

• Engineering, Mechanical
• Engineering, Metallurgy
• Engineering, Materials Science

Statement dc:rights

• Copyright 1991 Goettsch, David Douglas

Language dc:language

eng

Identifier

AAI9210816
(UMI)AAI9210816

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/20305