Microstructure of austenite under different conditions (a) B150-steel, 920 °C-10 s (b) B145-steel, 920 °C-10 s (c) 73-steel, 920 °C-10 s (d) B150-steel, 940 °C-30 s (e) B145-steel, 940 °C-30 s (f) 73-steel, 940 °C-30 s.

Microstructure of austenite under different conditions (a) B150-steel, 920 °C-10 s (b) B145-steel, 920 °C-10 s (c) 73-steel, 920 °C-10 s (d) B150-steel, 940 °C-30 s (e) B145-steel, 940 °C-30 s (f) 73-steel, 940 °C-30 s.

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The austenite grain growth and recrystallization behaviors of three pipeline steels with different Nb contents were investigated through reheating and thermal simulation compression experiments. The initiation conditions for dynamic and sub-dynamic recrystallization of austenite were analyzed, and sub-dynamic recrystallization equations in Avrami f...

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