Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel

Materials

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