以新开发的高强高韧20SiMn3NiA低合金马氏体钢为研究对象，用热模拟试验机对其在900~1000℃进行了双道次压缩，应变速率为1.0s^-1，道次间隔时间为1~100s，研究了其静态软化行为。结果表明：当变形温度为900℃时，随着道次间隔时间的延长，试验钢在第二道次变形时的真应力-真应变曲线由动态再结晶型（软化趋势大于硬化趋势）变为静态再结晶型（硬化趋势大于软化趋势），静态再结晶率由道次间隔时间为1s时的6.48%增至稳定值85%；当变形温度为1000℃时，其第二道次变形时的真应力-真应变曲线均为静态再结晶型，静态再结晶率由道次间隔时间为1s时的84.48%增至100s时的96%；试验钢的静态再结晶激活能为448kJ·mol^-1。

With the new developed high-strength and high-toughness 20SiMn3NiA low-alloy martensite steel as a research object, the double-pass compression tests were conducted on the steel by a thermal simulator at 900-1 000 ℃ and strain rate of 1.0 s^-1 for pass intervals between 1 s and 100 s. And the static softening behavior of the steel was studied. The results show that at the deformation temperature of 900 ℃, with the pass interval prolonging, the true stress-true strain curves during second pass deformation of the tested steel exhibited a change from dynamic recrystallization character (namely greater trend of softening than hardening) to static recrystallization character (namely greater trend of hardening than softening). The static recrystallization fraction increased from 6.48% with pass interval of 1 s to a nearly stable value of 85%. At the deformation temperature of 1 000 ℃, the true stress-true strain curves during second pass deformation had a static recrystallization character. The static recrystallization fraction increased from 84.48% with pass interval of 1 s to 96% with pass interval of 100 s. The static active energy of the tested steel was 448 kJ ·mol^-1.