Dynamic CCT curves and microstructure evolution of EH460 ship plate steel

doi:10.13251/j.issn.0254-6051.2020.10.030

Abstract

Abstract: Gleeble 3800-thermal simulation test machine was used to conduct double-pass compression tests on EH460 plate steel under deformation of 30% at 1050 ℃ and 30% at 850 ℃.The expansion curve of steel during continuous cooling at different cooling rates was plotted and the microstructure of the specimens at room temperature under different cooling rates was observed under optical microscope. The dynamic CCT curve of ship plate steel was plotted by Origin 8.0 software combining expansion method and metallographic method. The results show that when the cooling rate was 0.1-3 ℃/s, the obtained microstructure at room temperature was mainly ferrite and pearlite. When the cooling rate is greater than 5 ℃/s, granular bainite ppears. With the increase of cooling rate, bainite gradually increases, while ferrite and pearlite gradually decrease. When the cooling rate is 0-15 ℃/s, pearlite disappears and the microstructure was ferrite and granular bainite. With the increase of the cooling rate to 20-50 ℃/s, the ferrite phase transition does not occur, and only granular bainite can be found.

Key words: ship plate steel, CCT curve, thermal expansion method, microstructure

CLC Number:

TG142.1

Ma Haoran, Liu Hongbo, Liu Chong, Li Jianxin, Tian Zhiqiang, Zhang Peng. Dynamic CCT curves and microstructure evolution of EH460 ship plate steel[J]. Heat Treatment of Metals, 2020, 45(10): 154-157.

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