连续退火生产Q&P钢均热过程的热力学分析  

Thermodynamic analysis of soaking process for continuous annealing of Q&P steel

作　　者：何方[1] 王瑞珍[1] 杨才福[1] 贾亚飞 吴彦欣 成子豪 He Fang;Wang Ruizhen;Yang Caifu;Jia Yafei;Wu Yanxin;Cheng Zihao(Institute of Engineering Steel,Central Iron and Steel Research Institute,Beijing 100081,China;Technology Center,HBIS Hansteel,Handan Hebei 056015,China;Institute of Engineering Technology,University of Science&Technology Beijing,Beijing 100083,China)

机构地区：[1]钢铁研究总院工程用钢研究所,北京100081 [2]河钢邯钢技术中心,河北邯郸056015 [3]北京科技大学工程技术研究院,北京100083

出　　处：《金属热处理》2019年第11期113-118,共6页Heat Treatment of Metals

基　　金：扁平材全流程智能化制备关键技术(2017YFB0304103)

摘　　要：Q&P钢的连续退火工艺是一种广泛采用的热处理办法,本文从热力学的角度讨论了连续退火工艺均热过程数种Q&P钢奥氏体化的程度。重新计算了Fe-Si-Mn-C四元系固溶相BCC_A2和FCC_A1的热力学性质。结合连续退火工艺均热段的快速加热,短时保温,快速冷却的热处理工艺特点,按照PLE(Partition local equilibrium)和NPLE(Negligible partition local equilibrium)局部平衡计算了当前几种Q&P钢成分的FCC相线和奥氏体体积分数,并根据试验观测结果,提出了一种符合连续退火生产Q&P钢实际需求的准平衡相图计算方法:“准PLE”(Quasi-partition local equilibrium)计算方法,实际观测结果与理论预测结果符合较好。Continuous annealing process is a widely used heat treatment to produce Q&P steels.The austenitization degree of several Q&P steels in the soaking process of continuous annealing was discussed under thermodynamics assessment.The thermodynamic properties of the solid solution phases BCC_A2 and FCC_A1 in Fe-Si-Mn-C quaternary system were re-calculated.Combining with the characteristics of rapid heating,short time holding and rapid cooling in soaking section of continuous annealing process,the FCC phase lines and austenite volume fractions of several Q&P steels were calculated according to the local equilibrium of PLE(Partition local equilibrium)and NPLE(Negligible partition local equilibrium).According to the experimental results,a quasi-equilibrium phase diagram calculation method quasi-PLE(quasi-partition local equilibrium)is proposed to meet the actual demand of continuous annealing production of Q&P steels,and the actual observation results agree well with the theoretical prediction.

关 键 词：Q&P 连续退火 Fe-Si-Mn-C系 计算相图 准平衡 

分 类 号：TG142.33[一般工业技术—材料科学与工程]