摘要
利用Gleeble-3500热模拟试验机研究了Nb-Ti微合金化试验钢连续冷却相变规律。研究结果表明，试验钢在2～50℃／s的较大冷却速度范围内均可获得贝氏体组织，且随着冷却速度的增加，组织中粒状贝氏体的量下降，板条贝氏体的量增加；同时变形促进相变，有利于奥氏体中新相的形成。用热膨胀法建立了试验钢静态和动态条件下的CCT曲线，为Nb—Ti复合微合金化钢制定合理的控轧控冷工艺提供了依据。
The continuous cooling transformation process of Nb-Ti microalloyed steel was studied by means of Gleeble -3500 thermal-mechanical simulator. The results showed that bainite was obtained at a wide range of cooling rate from 2 ℃/s to 50 ℃/s, and with the increase of the cooling rate, the amount of granular bainite decreased, while the amount of lath bainite increased, and deformation promoted phase transformation. Thermal expansion method was used to obtain the continuous cooling transformation curves under deformed and un-deformed conditions, which provided theoretical basis for formulating TMCP process for Nb-Ti microalloved steel.
出处
《首钢科技》
2014年第5期16-21,共6页
Shougang Science and Technology
关键词
铌-钛微合金化
高强钢
连续冷却相变
CCT曲线
Nb-Ti microalloying, high strength steel, continuous cooling transformation, CCT curve
