Materials | |
Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel | |
Chunquan Liu1  Fen Xiong1  Yong Wang1  Yuxin Cao1  Xinbin Liu1  Longsheng Peng2  Qichun Peng3  Zhengliang Xue3  | |
[1] Hunan Institute of Technology, Hengyang 421002, China;Hunan Lifang Roll Co., Ltd., Hengyang 421600, China;The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; | |
关键词: medium Mn steel; strength mechanism; nanometer-sized carbide; precipitation; | |
DOI : 10.3390/ma14237461 | |
来源: DOAJ |
【 摘 要 】
This study investigates the strengthening mechanism and carbide precipitation behavior of medium Mn steel with Nb-Mo microalloy after cyclic quenching and austenite reverse transformation treatment. The results show that the Nb/Mo element not only precipitates (Nb,Mo)C in the grains, hindering the movement of dislocations and increases the strength, but also segregates at the austenite/ferrite grain boundary, thus delaying the transformation from austenite to ferrite. In addition, a large amount of nano-scale cementite is retained after cyclic quenching and austenite reverse transformation, which has a positive effect on the proportion of retained austenite in medium Mn steel. Moreover, the carbides with small size and low Mn content are dissolved, and the decomposed C and Mn content are beneficial to the nucleation of austenite during the intercritical annealing process at a temperature of 690 °C.
【 授权许可】
Unknown