摘要
以热力学和动力学为基础,对Fe Nb C N系统在奥氏体中的析出行为进行模拟,预测了奥氏体在等温和冷却过程中的析出动力学,分析了变形工艺和冷却制度对碳氮化物析出体积分数、析出开始和结束时间等动力学参数的影响·结果表明,在900℃左右的鼻子区,析出动力学过程明显加速;变形大大促进了碳氮化物的析出,缩短了析出的开始时间;随着冷却速率的增大,连续冷却析出的开始温度和结束温度均有所降低,并且析出变得越来越不充分·用该方法进行的计算机模拟结果和实验结果吻合良好·
The precipitation behavior of Fe-Nb-C-N system in austenite was simulated on the basis of thermodynamics and kinetics. Thus, the precipitation kinetics of carbonitride in isothermal and cooling process was predicted, and the influence of deformation process and cooling condition on kinetic parameters, such as volume fraction and starting/finishing time of precipitation was analyzed. The results indicate that the precipitation is obviously accelerated kinetically at about 900℃, because the deformation greatly inhances the carbonitride precipitation and shortens the starting time for precipitation. With increasing cooling rate, the starting/finishing temperatures of CCP both decrease with full precipitation more and more difficult to take place. The simulated results are in agreement with experimental results.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第4期351-354,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(50334010)
5047086)
辽宁省自然科学基金资助项目(20041009).
关键词
含NB钢
析出动力学
碳氮化物
应变诱导析出
Nb microalloyed steels
precipitation kinetics
carbonitride
strain induced precipitation
