E36船板钢连续冷却转变行为研究

Continuous cooling transformation behaviour of E36 steel

在THERMECMASTOR_Z热模拟实验机上测定了E36船板钢的连续冷却转变曲线，利用光学显微镜对钢组织进行了观察，并利用维氏硬度计对E36钢硬度进行了测定。结果表明，试验钢奥氏体向铁素体转变温度在785-590℃范围内。当冷却速率小于20℃／s时，随着冷却速率的增快，E36钢晶粒度增加较为明显；而当冷却速率大于20℃／s时，E36钢晶粒度变化趋于平缓。当冷却速率小于20℃／s和大于60℃／s时，E36钢维氏硬度值增加较大；而当冷却速率在20～60℃／s范围时，E36钢雏氏硬度的变化趋于平缓。

The continuous cooling transformation curves of E36 steel are studied by THERMECMASTOR-Z thermal mechanical simulation. The steel microstructure is observed by means of an optical microscope, and the steel hardness is measured. The results show that. γ→α transformation temperature is between 785-590 ℃ for the E36 steel; the grain size increases obviously with the raised cooling rate when the cooling rate is lower than 20 ℃/s, while grain size tends to vary gently with the raised cooling rate when the cooling rate is higher than 20 ℃/s Vickers hardness increases obviously with the increasing cooling rate when the cooling rate is lower than 20 ℃/s or higher than 60 ℃/s, while Vickers hardness tends to vary gently in the cooling rate range of 20-60 ℃/s.