日本金属学会誌

J. Japan Inst. Metals, Vol. 54, No. 4 (1990),
pp. 413-419

Mössbauer Effect Study on the Isothermal Transformation of Austenite in a SUP6 Steel

Hisashi Kuwano1, Iwao Sawai2, Shoji Uchida2 and Yoshikazu Hamaguchi1

1Department of Metallurgical Engineering, Faculty of Engineering, Muroran Institute of Technology, Muroran
2Muroran R & D Lab., Nippon Steel Corp., Muroran

Abstract:

The isothermal transformation of austenite in a SUP6 steel has been investigated by means of Mössbauer spectroscopy. The amount of retained austenite and its carbon content are measured as a function of holding time at an annealing temperature.
Carbon content of retained austenite increases with time up to 1.8%, which may be overestimated by the thickness effect, during annealing at 723 K. The amount of retained austenite at room temperature changes linearly with carbon content of austenite. Retained austenite is formed when its carbon content exceeds about 1.0%. The decrease in carbon content and the amount of retained austenite is accompanied by the formation of χ-Fe5C2 carbide.


(Received 1989/11/4)

Keywords:

Mössbauer effect, retained austenite, bainitic transformation, SUP6 steel, carbon in austenite


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