1. Central Iron and Steel Research Institute, Beijing 100081, China 2. Shougang Research Institute of Technology,Beijing 100043, China 3. School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, Sichuan, China
Influences of Austenization Temperature and Annealing Time on Duplex Ultrafine Microstructure and Mechanical Properties of Medium Mn Steel
1. Central Iron and Steel Research Institute, Beijing 100081, China 2. Shougang Research Institute of Technology,Beijing 100043, China 3. School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, Sichuan, China
ժҪ A duplex ultrafine microstructure in a medium manganese steel (0.2C-5Mn) was produced by austenite reverted transformation annealing (ART-annealing). The microstructural evolution during annealing was examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Based on the microstructure examination, it was found that some M3C type carbides appeared in the martensitic matrix at the beginning of the ART-annealing. But with further increasing annealing time, these carbides would be dissolved and finally disappeared. Meanwhile, the austenite lath was developed in the ART-annealing process and the volume fraction of austenite increased with the increase of the annealing time, which resulted in a duplex microstructure consisting of ultrafine-grained ferrite and large fraction of reverted austenite after long time annealing. The mechanical property examinations by uniaxial tensile tests showed that ART-annealing (6 h, 650 ��) resulted in a superhigh product of strength to elongation up to 42 GPa��%.
Abstract��A duplex ultrafine microstructure in a medium manganese steel (0.2C-5Mn) was produced by austenite reverted transformation annealing (ART-annealing). The microstructural evolution during annealing was examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Based on the microstructure examination, it was found that some M3C type carbides appeared in the martensitic matrix at the beginning of the ART-annealing. But with further increasing annealing time, these carbides would be dissolved and finally disappeared. Meanwhile, the austenite lath was developed in the ART-annealing process and the volume fraction of austenite increased with the increase of the annealing time, which resulted in a duplex microstructure consisting of ultrafine-grained ferrite and large fraction of reverted austenite after long time annealing. The mechanical property examinations by uniaxial tensile tests showed that ART-annealing (6 h, 650 ��) resulted in a superhigh product of strength to elongation up to 42 GPa��%.
��������:National Natural Science Foundation of China (NSFC);National Key Basic Research and Development Program of China;National Basic Research Program of China (973 Program;Foundation of National Engineering Research Center for Equipment and Technology of Cold Rolling Strip, Yanshan University
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E-mail: chxhuang@scu.edu.cn
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Chang WANG,Wen-quan CAO,Yun HAN,Cun-yu WANG,Chong-xiang HUANG,Han DONG. Influences of Austenization Temperature and Annealing Time on Duplex Ultrafine Microstructure and Mechanical Properties of Medium Mn Steel[J]. �й������ڿ���, 2015, 22(1): 42-47.
Chang WANG,Wen-quan CAO,Yun HAN,Cun-yu WANG,Chong-xiang HUANG,Han DONG. Influences of Austenization Temperature and Annealing Time on Duplex Ultrafine Microstructure and Mechanical Properties of Medium Mn Steel. Chinese Journal of Iron and Steel, 2015, 22(1): 42-47.
2015, Vol. 22 
