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通过在Gleeble-3500热模拟试验机上进行的两道次热压缩变形试验,对含铌微合金管线钢的静态软化行为进行了研究。采用应力补偿法计算了不同变形温度下的静态再结晶百分数。变形温度和弛豫时间对X120钢的静态再结晶影响很大。根据试验数据和静态再结晶动力学方程,计算出X120管线钢静态再结晶激活能为401.56kJ.mol-1。绘制了试验钢的析出动力学(PTT)曲线。
The static softening behavior of niobium microalloyed pipeline steels was investigated by two-pass hot compression deformation test on a Gleeble-3500 thermal simulator. The percentage of static recrystallization under different deformation temperatures was calculated by stress compensation method. The deformation temperature and relaxation time greatly influence the static recrystallization of X120 steel. According to the experimental data and static recrystallization kinetics equation, the static recrystallization activation energy of X120 pipeline steel was calculated to be 401.56kJ · mol-1. The precipitation kinetics (PTT) curve of the test steel is plotted.