At high temperatures, the material is entirely austenite, but upon cooling enters a region where the stable phases are ferrite and austenite.
在较高温度时，这种材料全部是奥氏体，但随着冷却就进入到铁素体和奥氏体稳定状态的区域。
The stable reverted austenite formed during heat treatment would be positive to the fracture toughness.
热处理形成的稳定的逆转变奥氏体对断裂韧度起到积极作用。
Because the temperature of retained austenite is more and more stable after the isothermal quenching, it should be carried out four times.
由于等温淬火后的残余奥氏体温度较多而且稳定，故应进行四次回火。
Because the temperature of retained austenite is more and more stable after the isothermal quenching, it should be carried out four times.
由于等温淬火后的残余奥氏体温度较多而且稳定，故应进行四次回火。
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