温轧40CrMo中厚钢板在退火过程中铁素体与碳化物的协同演变规律

doi:10.11896/cldb.21070164

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Abstract The warm-rolled 40CrMo steel was annealed at 700 ℃ and held for 15 min, 60 min, and 120 min, respectively. The synergistic evolution of ferrite and carbide was observed by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) techniques. The results show that a large number of nano-scale carbides are dispersed in the microstructure of the warm-rolled sheet. After 15 min annealing and heat preservation, the recovery mechanism of ferrite in the microstructure is dominant. Banded ferrite tends to transform to equiaxed shape, and the average grain size of ferrite is 0.76 μm. The size of carbides inside ferrite grains is small, and the size of carbides on grain boundaries is larger, with an average size of carbides of 54.85 nm. After extending the annealing holding time to 60 min, the recrystallization of ferrite and the growth of some grains mainly occurred in the microstructure. At this time, the average grain size of ferrite is 1.86 μm, the carbides begin to grow and spheroidize, and the average size of carbides is 57.55 nm. After annealing for 120 min, the growth mechanism dominated the tissue. At this time, the growth of grains and the migration of grain boundaries are most obvious, and coarse ferrite (4.15 μm) and carbide (61 nm) are obtained. With the prolongation of annealing time, the grain boundary undergoes three stages of evolution: sub-grain boundary migration, high-angle grain boundary rapid proliferation and high-angle grain boundary slow proliferation. In this work, by fitting the experimental data, the kinetic model of ferrite and carbide growth in the annealing process of 40CrMo steel warm-rolled plate was constructed, which coordinated growth mechanism of ferrite and carbide was found to be related to the growth rate.

Key words： 40CrMo steel warm-rolled annealing carbide grows up grain boundary evolution kinetic model

Published: 25 April 2023 Online: 2023-04-24

CLC number:

TG142

Fund:National Natural Science Foundation of China (51974134), and Major Science and Technology Special Project of Hebei Province (21281008Z).

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	DU Jinliang
	YANG Lina
	FENG Yunli
	LI Jie
	LIU Guolong
	LIN Ran

Cite this article:

DU Jinliang,YANG Lina,FENG Yunli, et al. Co-evolution of Ferrite and Carbide During Annealing of Warm-rolled 40CrMo Medium and Thick Steel Plate[J]. Materials Reports, 2023, 37(8): 21070164-3.

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http://www.mater-rep.com/EN/10.11896/cldb.21070164 OR http://www.mater-rep.com/EN/Y2023/V37/I8/21070164

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