TRANSACTIONS OF THE AMERICAN FOUNDRY SOCIETY, VOL 120
04/2012
Doru Stefanescu, Foundry technologies, Foundry Technologies, Gorka Alonso, Iron foundry, Jon Sertucha, Pello Larrañaga, R&D+i, Ramón Suarez
The amount of primary austenite at the end of solidification in the microstructure of cast iron has a direct impact on the mechanical properties. However, the large majority of papers discussing the mechanical properties of cast iron relate these properties only to graphite shape. The main reason is the difficulty in correctly assessing the amount of primary austenite in the microstructure. This paper describes two methods of measuring the fraction of primary austenite in cast iron: i) through the use of cooling curve analysis, and ii) through quantitative evaluation of color-etched micrographs. The first method also allows the evaluation of solid fraction evolution along the solidification process, which is validated with quenched (interrupted solidification) gray iron specimens.
Gorka Alonso (AZTERLAN), Doru M. Stefanescu (Ohio State University and University of Alabama), Pello Larrañaga (AZTERLAN), Jon Sertucha (AZTERLAN), Ramón Suárez (AZTERLAN)
gray iron, primary austenite, cooling curve analysis, interrupted solidification
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