（1. Plate Business Unit, Nanjing Iron and Steel Co., Ltd., Nanjing 210035, Jiangsu, China 2. College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China）
Abstract：In view of the problem of the undulation of low temperature impact toughness in the production of Ti microalloyed plate, the corresponding experimental studies were carried out. The main influence factors of the undulation of low temperature impact toughness were analyzed from the aspects of the chemical component, fracture morphology of the impact specimen, microstructure and inclusions. The results showed that the content of harmful elements, internal structure, size and distribution of inclusions etc. were the major causes of the big undulation of low temperature impact toughness. Therefore, the composition was optimized by appropriately reducing the C mass fraction and strictly controlling the mass fraction of harmful elements P, N, H etc., the parameters of the heating process were carefully controlled to refine the microstructure, and the cooling rate was accelerated after rolling to effectively weak the banded structure and so on, which can obvious improve the low temperature impact toughness and product qualification rate.
吴俊平，靳星，龙木军，陈登福，刘涛，段华美. 含钛微合金钢低温冲击韧性波动的原因与改进[J]. 中国冶金, 2017, 27(12): 59-65.
WU Jun- ping，JIN Xing，LONG Mu- jun，CHEN Deng- fu，LIU Tao，DUAN Hua- mei. Cause analysis and improvement of undulation of low temperature impact property for Ti microalloyed steel. China Metallurgy, 2017, 27(12): 59-65.
2017, Vol. 27 
