Austenite separates the martensite blocks or laths so that it can reduce the effectivegrainsize and prevent cracks from propagating.
奥氏体组织分割了马氏体束或马氏体板条，减小了有效晶粒尺寸，阻止裂纹扩展，提高材料的韧性和塑性；
2
The mechanical property and the grainsize of the steel ingot after smithing are ensured without generating a crackle during smithing by using a rational and effective smelting method.