Q&P钢奥氏体相变动力学模型研究  

Research on austenite transformation kinetic model of Q&P steel

作　　者：李韶文 周晓光[1] 李鑫[1] 贾泽伟 刘振宇[1] LI Shaowen;ZHOU Xiaoguang;LI Xin;JIA Zewei;LIU Zhenyu(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《轧钢》2022年第4期41-45,69,共6页Steel Rolling

基　　金：国家重点研发计划项目(2017YFB0304104);国家重点研发计划项目(2017YFB0305002);国家重点研发计划项目(2021YFB3702404)。

摘　　要：针对Q&P钢实际生产中需要建立适用于连退工艺的奥氏体相变动力学模型的问题,通过热膨胀试验测得了在不同加热速率条件下Q&P钢的奥氏体相变膨胀曲线,基于JMAK方程建立了适用于连退工艺的奥氏体相变动力学模型,计算得到了试验钢相变激活能Q=9.66×10^(5)J/mol,相变动力学参数n=0.185,lnk_(o)=104.64。利用DIL805A/D膨胀仪对试验钢在两相区进行了保温+淬火试验,确定了不同工艺下的奥氏体体积分数。结果表明:当保温温度一定时,在较短时间奥氏体体积分数达到峰值,延长保温时间奥氏体体积分数增加缓慢;在相同保温时间下,保温温度越高,奥氏体体积分数越大。模型计算的奥氏体体积分数与试验结果吻合良好,能够准确预测奥氏体相变的体积分数。Aiming at the problem of establishing an austenitic transformation kinetic model suitable for the continuous annealing process in the actual production of Q&P steel, the austenite transformation expansion curves of Q&P steel under different heating rates were measured through thermal expansion tests.Based on the JMAK equation, the kinetic model of austenite transformation suitable for continuous annealing process was established, and the activation energy of transformation of the tested steel was calculated as Q=9.66×10^(5) J/mol, and the kinetic parameters of transformation were n=0.185 and lnk_(o)=104.64. Using the DIL805 A/D dilatometer, the holding + quenching test was carried out on the tested steel in the two-phase region, and the austenite volume fraction under different processes was determined. The results show that when the holding temperature was constant, the volume fraction of austenite reaches the peak value in a short time, and the volume fraction of austenite increased slowly with the prolongation of holding time. Under the same holding time, the higher the holding temperature, the larger the austenite volume fraction. The austenite volume fraction calculated by the model is in good agreement with the experimental results, and the volume fraction of austenite transformation can be accurately predicted.

关 键 词：Q&P钢 奥氏体相变 相变动力学 数学模型 

分 类 号：TG142.1[一般工业技术—材料科学与工程] U465.11[金属学及工艺—金属材料]