摘要
一次淬火马氏体及其体积分数的控制是淬火-配分(Q&P)钢组织性能控制的基础。Q&P钢的连续退火生产中,均热温度及快冷结束温度对一次淬火马氏体体积分数起决定作用。利用PE(para-equilibrium)的热力学平衡假设计算了不同临界区温度均热时奥氏体中的碳含量,并采用透射电镜检测了淬火后马氏体中的碳含量,验证了热力学计算结果的可靠性。通过热膨胀试验研究了不同临界区温度均热时马氏体相变的体积分数与冷却结束温度之间的关系,建立了适用于临界区均热的一次淬火马氏体相变体积分数与冷却结束温度关系的数学模型,该模型可为Q&P钢连续退火工艺的制定提供依据。
Control of primarily quenched martensite and its volume fraction is the base of the microstructure and properties control of quenching and partitioning(Q&P)steel.In the continuous annealing production of Q&P steel,the volume fraction of primarily quenched martensite is determined by the soaking temperature and the fast cooling ending temperature.The carbon content of austenite under different intercritical soaking temperatures was calculated by the thermodynamic equilibrium hypothesis of PE(para-equilibrium),and the carbon content of martensite after quenching was detected by transmission electron microscopy,which verified the accuracy of the thermodynamic calculation results.The relationship between the volume fraction of transformed martensite and the cooling ending temperature under different intercritical soaking temperatures was studied by thermal expansion test.A mathematical model of the relationship between the volume fraction of primarily quenched martensite and the cooling ending temperature,which was suitable for the intercritical soaking,was established.The model can provide a basis for the determination of continuous annealing process of Q&P steel.
作者
何方
王瑞珍
杨才福
刘鹏
吴彦欣
HE Fang;WANG Ruizhen;YANG Caifu;LIU Peng;WU Yanxin(Central Iron and Steel Reserch Institute, Beijing 100081, China;Technology Center, HBIS Group Hansteel, Handan Hebei 056015, China;University of Science and Technology Beijing, Beijing 100083, China)
出处
《上海金属》
CAS
2021年第1期31-36,共6页
Shanghai Metals
基金
国家重点研发计划(No.2017YFB0304103)。
关键词
Q&P钢
临界区均热
一次淬火马氏体
马氏体体积分数
quenching and partitioning(Q&P)steel
intercritical soaking
primarily quenched martensite
martensitic volume fraction
