日本金属学会誌

J. Japan Inst. Metals, Vol. 54, No. 12 (1990),
pp. 1314-1319

Growth of Cr7C3 Carbide Particles in Rapidly Quenched Fe-Cr-C Alloy Thin Film

Joo Ishihara1, Toshio Ogawa2 and Teturo Uchida2

1Hitachi Technical College, Hitachi, Ltd., Ibaraki
2Hitachi Research Laboratory, Hitachi, Ltd., Ibaraki

Abstract:

The growth characteristics of the Cr7C3 type carbide in austenite containing various chromium contents have been investigated in the ranges of 1173 to 1473 K and 0.6-12 ks. The specimens for this investigation were made by the rapid quenching method which is used for making amorphous metals and a highly supersaturated solid solution was obtained. The observed coarsening rate of the Cr7C3 type carbide, however, is much higher than the theoretical rate expected from the mechanism of Ostwald ripening. This disagreement has been interpreted as being caused by precipitation from the highly supersaturated solid solution which is induced by the rapid quenching method. In proportion as the chromium concentration increases, the growth rate of the Cr7C3 type carbide became slower. This tendency was thought to be in good agreement with the theory of Ostwald ripening.


(Received 1990/7/23)

Keywords:

rapidly quenched metals, Ostwald ripening, carbide dispersion technique, Cr7C_3 carbide, growth rate of carbide, roll production method, fine surface roll, effect of chromium content


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