1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China 2. State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
Effect of Cyclic Annealing on Microstructure and Mechanical Properties of Medium Carbon Steel
1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China 2. State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
ժҪ The microstructure and mechanical properties of medium carbon steel after cyclic heat treatment were investigated. The effects of cyclic numbers and long time annealing on the microstructure and mechanical properties of the experimental steel were compared. A short-duration (5 min) holding at 1023 K (above A1 temperature) and a short-duration (3 min) holding at 893 K are adopted in each cyclic heat treatment. The spheroidization is accelerated during cyclic heat treatment, and the spheroidizing ratio grows with cyclic numbers. After 12-cycle heat treatments, there are few incompletely spheroidized regions in the specimens, and cementite lamellae mostly change into cementite particles. The morphological character of cementite for 12 cycles is similar to that undergoing annealing for 10 h at 973 K. The strength of the experimental steel after 5-cycle heat treatment is the lowest in the following cyclic heat treatment, but it is still higher than that of specimens with subcritical annealing over a long period (10 h). After 12-cycle heat treatment, the strength of the experimental steel is close to that of the normalized steel, and the plasticity is the best in all heat-treated specimens.
Abstract��The microstructure and mechanical properties of medium carbon steel after cyclic heat treatment were investigated. The effects of cyclic numbers and long time annealing on the microstructure and mechanical properties of the experimental steel were compared. A short-duration (5 min) holding at 1023 K (above A1 temperature) and a short-duration (3 min) holding at 893 K are adopted in each cyclic heat treatment. The spheroidization is accelerated during cyclic heat treatment, and the spheroidizing ratio grows with cyclic numbers. After 12-cycle heat treatments, there are few incompletely spheroidized regions in the specimens, and cementite lamellae mostly change into cementite particles. The morphological character of cementite for 12 cycles is similar to that undergoing annealing for 10 h at 973 K. The strength of the experimental steel after 5-cycle heat treatment is the lowest in the following cyclic heat treatment, but it is still higher than that of specimens with subcritical annealing over a long period (10 h). After 12-cycle heat treatment, the strength of the experimental steel is close to that of the normalized steel, and the plasticity is the best in all heat-treated specimens.
��������:National Natural Science Foundation of China;National Natural Science Foundation of China
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E-mail: zhiqinglv@163.com
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Zhi-qing L�\,Hui-fang ZHANG,Qing MENG,Zhen-hua WANG,Wan-tang FU. Effect of Cyclic Annealing on Microstructure and Mechanical Properties of Medium Carbon Steel[J]. �й������ڿ���, 2016, 23(2): 145-150.
Zhi-qing L�\,Hui-fang ZHANG,Qing MENG,Zhen-hua WANG,Wan-tang FU. Effect of Cyclic Annealing on Microstructure and Mechanical Properties of Medium Carbon Steel. Chinese Journal of Iron and Steel, 2016, 23(2): 145-150.
2016, Vol. 23 
