Influences of Martensite on the Impact Characteristics of Austempered Spheroidal Graphite Cast Iron

Influence of martensite on the impact characteristics of austempered spheroidal graphite cast iron was examined by shortening isothermal transformation time, subzero treatment and addition of cyclic stress. The impact characteristics was measured by instrumented Charpy impact test. As a result, the...

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Bibliographic Details
Published inTHE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY Vol. 62; no. 3; pp. 191 - 195
Main Authors Mizuno, Shinya, Hibino, Yoshihiro, Ishikawa, Hideo
Format Journal Article
LanguageJapanese
Published Japan Foundry Engineering Society 25.03.1990
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Summary:Influence of martensite on the impact characteristics of austempered spheroidal graphite cast iron was examined by shortening isothermal transformation time, subzero treatment and addition of cyclic stress. The impact characteristics was measured by instrumented Charpy impact test. As a result, the retained austenite transform to martensite because of temperature or stress induced transformation at prescribed conditions. These martensite lower the impact value. This is estimated that these martensite mainly shorten the crack generation time with lowering of excellent plastic deformation ability of the retained austenite.
ISSN:0021-4396
2186-0335
DOI:10.11279/imono.62.3_191