Isothermal decomposition of supercooled austenite in spring steels
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Alloying of steel 55S2 with mangaense and molybdenum, and also manganese and vanadium, increases the stability of supercooled austenite and lowers the critical cooling rate. Additional alloying with cerium has a similar effect.
The stability of supercooled austenite is highest in steels 55S2GM4 and 55S2GM. The temperature of the minimal stability of austenite is 50–1000 lower.