Fig. 5From: Recrystallization-based formation of uniform fine-grained austenite structure before polymorphic transition in high-strength steels for Arctic applicationsMicrostructure of F620 steel alloyed with Nb: а transformed from austenite exposed for 60 s at Т = 1200 °С, D γ = 100 μm; b austenite deformed with pauses regulated, D γ = 15 μm; c not regulated, D γ = 50 μm; and d microhardnessBack to article page