Heat Treatment of Metals ›› 2024, Vol. 49 ›› Issue (7): 146-151.DOI: 10.13251/j.issn.0254-6051.2024.07.022

• MATERIALS RESEARCH • Previous Articles     Next Articles

Continuous cooling transformation of austenite in 390 MPa grade anti-collision hull steel

Chen Zuoning1,2, Shi Zhongran2, Hu Qian1, Zhan Zhide2,3, Luo Xiaobing2   

  1. 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
    2. Research Institute of Structural Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China;
    3. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
  • Received:2024-01-22 Revised:2024-04-29 Online:2024-07-25 Published:2024-08-29

Abstract: Continuous cooling transformation behavior of 390 MPa grade anti-collision hull steel under dynamic and static conditions was studied by using Gleeble-3800 thermal simulation testing machine. The dynamic and static CCT curves of the tested steel were drawn by measuring the expansion curves of continuous cooling process at different cooling rates and combining with metallographic-hardness method. The results show that compared with the static condition, the cooling rate range of ferrite and pearlite transformation of the tested steel under dynamic condition is reduced from 0.1-20 ℃/s to 0.1-10 ℃/s, the cooling rate range of bainite transformation is expanded from 0.5-40 ℃/s to 0.1-40 ℃/s, and the cooling rate range of martensite transformation is expanded from 40 ℃/s to 10-40 ℃/s. The dynamic CCT curves moves to the upper left compared with the static CCT curves, indicating that the ferrite and pearlite phase transformation region enlarged and the bainite and martensite phase transformation region reduced.

Key words: anti-collision steel, dynamic and static CCT curves, microstructure, hardness, cooling rate

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