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采用Gleeble-3500热力模拟机对超高强双相钢DP980进行双道次压缩试验研究其在950~1150℃、道次间歇时间1~500 s条件下的静态软化行为,并建立了静态再结晶动力学模型。结果表明:相同变形条件下,软化程度随温度升高而加强;相同温度下,随道次间歇时间的延长,软化率增加。DP980双相钢静态再结晶软化50%所需时间t_(0.5)=5.98×10~(-18)ε~(-4.36)ε~(0.53)d_0exp(341 594/RT),静态再结晶的激活能Q_s=341.6 kJ/mol。静态再结晶动力学模型为X_s=1-exp[-0.693(t/t_(0.5))~(0.49)],对比试验与计算结果,模型能很好地预测静态再结晶软化率。
The Gleeble-3500 thermal simulator was used to test the static softening behavior of ultra high strength duplex DP980 under static pressure of 950 ~ 1150 ℃ and intermittent time of 1 ~ 500 s. The static recrystallization kinetics Learn model The results show that under the same deformation conditions, the degree of softening increases with the increase of temperature. At the same temperature, the softening rate increases with the increase of the interval time. The time required for the static recrystallization of DP980 dual-phase steel to be 50% softened by 50% t_ (0.5) = 5.98 × 10 ~ (-18) ε ~ (-4.36) ε ~ (0.53) d_0exp (341 594 / RT) Can Q_s = 341.6 kJ / mol. The static recrystallization kinetics model is X_s = 1-exp [-0.693 (t / t_ (0.5)) ~ (0.49). Compared with the experimental results, the model can well predict the static recrystallization softening rate.