Morphology of Retained Austenite and Its Effects on the Mechanical Properties of High Silicon Cast Steel

Acta Metall Sin

2007, Vol. 43

Issue (3): 235-239 DOI:

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Morphology of Retained Austenite and Its Effects on the Mechanical Properties of High Silicon Cast Steel

CHEN Xiang; LI Yanxiang

Key Laboratory for Advanced Materials Processing Technology; Ministry of Education of China; Department of Mechanical Engineering; Tsinghua University; Beijing 100084

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CHEN Xiang; LI Yanxiang. Morphology of Retained Austenite and Its Effects on the Mechanical Properties of High Silicon Cast Steel. Acta Metall Sin, 2007, 43(3): 235-239 .

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Abstract The microstructure and morphology of retained austenite of the austempered high silicon cast steel after various austempering combinations are investigated by TEM, and the volume fraction of retained austenite is also studied by XRD method. The experiments indicate that the retained austenite present at the isothermal transformation temperature has two typical morphologies, film shaped and blocky retained austenite. There are K-S orientation relationship between interface of film shaped retained austenite and bainite ferrite. The film shaped retained austenite is conductive to both high strength and good toughness, while the blocky retained austenite has poor stability and thus is detrimental to the mechanical properties of the steel. It is suggested that the ratio of volume fraction of the film shaped/blocky retained austenite must exceed about 1.0 for optimum mechanical properties.

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Received: 27 June 2006

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