Effect of the austenitizing temperature on the kinetics of the isothermal transformation of supercooled austenite in 55KhGR and 50KhG steels
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Conclusions
- 1.
The stability of austenite in 55KhGR and 50KhG steels increases with increasing isothermal heating temperatures within the pearlitic region. Within the intermediate transformation region the stability of supercooled austenite first increases as the temperature is raised to 900°C and then decreases between 900 and 1100°C.
- 2.
The decrease in the stability of supercooled austenite with increasing quenching temperatures above a given limit in the intermediate transformation range can be explained by the increasing effect of the concentration of thermal vacancies on the redistribution of carbon in the austenite during the initial stages of bainitic transformation and the increase in the bainitic areas.
- 3.
Alloying the chromium-manganese steel (containing 0.5–0.6% C) with boron sharply increases the stability of supercooled austenite, and consequently, the hardenability of the steel.
Keywords
Austenite Boron Heating Temperature Bainitic Transformation Isothermal TransformationLiterature cited
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- 3.U. Wyss, "Schweiber Archiv" Vol. 26, No. 9 (1960).Google Scholar