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
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.
李德发 ，王世森，熊玉彰，邢淑清，熊涛，余宏伟. 轧后冷却工艺对铌钛微合金化低碳贝氏体钢组织性能的影响[J]. 钢铁, 2013, 48(3): 71-75.
Low-Carbon Bainite SteelLI De-fa,,WANG Shi-sen,XIONG Yu-zhang,XING Shu-qing,XIONG Tao,YU Hong-wei. Effect of Cooling Process After Rolling on Microstructure and Mechanical Property of Nb-Ti Microalloyed. Iron and Steel, 2013, 48(3): 71-75.
2013, Vol. 48 
