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| Effect of Cooling Process After Rolling on Microstructure and Mechanical Property of Nb-Ti Microalloyed |
| Low-Carbon Bainite SteelLI De-fa1,2,WANG Shi-sen2,XIONG Yu-zhang2,XING Shu-qing1,XIONG Tao2,YU Hong-wei2 |
1. Materials and Metallurgy School, UST Inner Mongolia, Baotou 014010, Nei Mongol， China
2. Research Institute, Wuhan Iron and Steel Group Corp., Wuhan 430080, Hubei, China |
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Abstract The effects of cooling process after rolling on microstructure, precipitated phase and mechanical properties of low-carbon bainite steel were investigated by method of SEM and TEM. The results show that ferrite and bainite dual phases can be obtained with air-cooling and accelerated cooling process after hot-rolled. The percentage of ferrite phase increases with the end of air-cooling temperature reduced, the size of ferrite and precipitated phase is larger, the lath of bainite is sharper and the edge is clearer. The shape of M/A constituent is film-like and changes with temperature. When temperature of completion in air-cooling are between 725℃ and 740℃, then it is cooled to 440℃ with cooling rate of 15℃/s, the comprehensive mechanical properties are excellent and can reach the requirements of Q690 of GB/T1591.
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Received: 19 June 2012
Published: 21 March 2013
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2013, Vol. 48 
