Optimization of Heat Treatment Regimes for 20GML Steel Blanks Operating at Temperatures down to –60°C

The study examines how heat treatment regimes affect the mechanical properties and microstructure of as-cast and forged 20GML steel blanks. The mechanical properties of the test specimens after introducing secondary normalization are evaluated. The results show that changes in the temperature of secondary normalization significantly affect the mechanical properties and impact toughness of the as-cast blanks. The study identifies optimal heat treatment regimes for 20GML steel blanks to ensure high mechanical properties and impact toughness at temperatures down to –60°C.