Abstract: Double-pass compression experiment with different interval time was designed to simulate the deformation process of 5% Ni cryogenic steel 07Ni5DR under the hot-rolling procedure. The static softening rate was calculated based on the stress-strain curves of the tested steel. In addition, the kinetic process of static recrystallization was analyzed to offer experimental and theoretical guidance for reasonably planning the rolling technology. Results indicate that the softening rate of the tested steel increased with the increase of deformation temperature and interval time. The activation energy of static recrystallization for the 5%Ni cryogenic steel was calculated to 233.97 kj/mol. Furthermore, the kinetic equation of the static recrystallization for the 5%Ni cryogenic steel was established.

摘要： 设计了不同间隔时间的双道次压缩实验,模拟热轧条件下5%Ni低温压力容器钢07Ni5DR的变形过程,实测了实验钢的应力-应变曲线。根据应力-应变曲线计算软化率,绘制出软化率-时间曲线,确定实验钢在不同变形温度变形后不同保持时间内的静态软化率。此外,分析静态再结晶动力学过程,为制定合理的轧制工艺提供了实验和理论依据。研究表明,5%Ni低温钢的静态再结晶软化率随变形温度的升高和道次间隔时间的延长而增大,其静态再结晶激活能为233.97 kJ/mol。此外,建立了5%Ni低温钢的静态再结晶动力学方程。