Influence of Mo on Dynamic Continuous Cooling Transform-ation of 1000 MPa Cold Rolled Dual Phase Steel
The expanding curves of two kinds of 1000 Mpa ultra-high strength cold rolled dual phase steels, which were C-Si-Mn-Cr and C-Si-Mn-Cr-Mo steel respectively, were detected on Gleeble-1500 thermal-mechanical simulator at different cooling rates. Combined with metallographic and hardness methods, the continuous cooling transformation curves (CCT) of the two steels were obtained. The results showed that Mo could raise the Ar3 temperature, and strongly restrain the pearlite and bainite transformation. The reason for this was the interaction that the addition of Mo could increase the chemical driving force of ferrite transformation and the activation energy for the diffusion of carbon in austenite, which could decelerate the ferrite transformation. The hardness of the two steels was similar in the cooling rates range of this experiment and got higher with the increase of the cooling rates. When the cooling rates was above 7℃/s, the hardness almost kept constant because the most part of the microstructure was martensite.
Mo dual phase steel cold rolled CCT ultra-high strength
ZHAO Xian-meng KANG Yong-lin HAN Qi-hang
School of Material Science and Engineering. University of Science and Technology Beijing, Beijing 100083, China
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
744-747
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）