Abstract: By measuring the dilatometric curves of Nb-Ti-V micro-alloying 0.04 ~ 0.08C-0. 6 ~ 1.2Ni-0.1 ~ 0. 5Cr- 0.1 ~0.5Cu crack-resistant steel EH47 for large container ship with cooling rate of 0. 05 ~50 ℃/s on a Gleeble-3800 thermomechanical simulator, and combining with metallographic analysis, a CCT diagram of austenite continuous cooling transformation is obtained. And the microstructure and hardness of the continuous cooling transformation occurring in EH47 crack-resistant steel are investigated. The results show that the microstructure of EH47 crack-resistant steel at 0. 05 〜 50 ℃/s cooling rate consists of ferrite + pearlite and accicular ferrite + bainite. Even the cooling rate as high as 50℃/s, no martensite occurs in the microstructure.

摘要： 采用Gleeble-3800热模拟实验机测定了Nb-Ti-V微合金化0.04～0.08C-0.6～1.2Ni-0.1～0.5Cr-0.1～0.5Cu大型集装箱船用EH47止裂钢在0.05～50℃/s冷速下连续冷却转变的膨胀曲线,结合光学显微镜的微观组织观察,得出了该钢奥氏体连续冷却转变过程中的CCT曲线;研究了EH47止裂钢连续冷却转变产物的组织形态和显微硬度。结果表明,EH47止裂钢在0.05～50℃/s冷却速率下的组织主要由铁素体+珠光体、针状铁素体+贝氏体组成,即使冷却速度达到了50℃/s,组织中仍然未见马氏体出现。