Analysis of the orientation relationships between austenite, Widmanstätten carbides, and martensite in the 150G4 high-carbon steel after isothermal γ → α transformation

The orientation relationships (ORs) between the initial austenite, Widmanstätten carbide (WC), and martensite have been analyzed by the electron-microscopic method. An OR between WC and martensite has been experimentally determined in addition to the well-known OR between WC and austenite and the Kurdjumov-Sachs OR between austenite and martensite. The realization of a concrete variant of the Bagaryatskii ORs between martensite and WC is determined by specific features of the kinetics of austenite transformation in hypereutectoid steels.