Co-evolution of Ferrite and Carbide During Annealing of Warm-rolled 40CrMo Medium and Thick Steel Plate
DU Jinliang1,2, YANG Lina1, FENG Yunli1,2,*, LI Jie1,2, LIU Guolong1, LIN Ran1
1 College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210, Hebei,China 2 Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, Tangshan 063210, Hebei, China
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.
杜金亮, 杨丽娜, 冯运莉, 李杰, 刘国龙, 吝冉. 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[J]. 材料导报, 2023, 37(8): 21070164-3.
DU Jinliang, YANG Lina, FENG Yunli, LI Jie, LIU Guolong, LIN Ran. Co-evolution of Ferrite and Carbide During Annealing of Warm-rolled 40CrMo Medium and Thick Steel Plate. Materials Reports, 2023, 37(8): 21070164-3.
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2023, Vol. 37 
