Because of grain size fined through IGF, higher strength and toughness were obtained.Therefore, it is of great importance to the development of microalloyed steel theoretically and practically.

• 通过晶内铁素铁的析出，细化了晶粒，提高了钢的强度与韧性，这对非调质钢的发展具有重要的实际及理论意义。