为了研究轧制工艺对WNQ570桥梁钢再结晶行为的影响，采用Gleeble-3500热模拟试验机模拟了其双道次热变形过程，测试了试验钢的应力-应变曲线，建立了静态再结晶晶粒体积分数随变形温度和道次间隔时间变化的关系模型，分析了应变诱导析出抑制对静态软化行为的影响。研究结果表明：静态再结晶体积分数随变形温度的提高或道次间隔时间的延长而增大，应变诱导析出抑制静态再结晶的进行；静态再结晶激活能为240.47kJ/mol。研究结果为制订试验钢二阶段控轧工艺提供了依据。
In order to study the effect of rolling process on the recrystallization behavior of WNQ570 steel for bridge, the two-pass hot deformation of WNQ570 steel for bridge was carried out using Gleeble-3500 thermal/mechanical simulator, and the stress-strain curves for the steel were obtained. One model for estimating the volume fraction of static recrystal grains varied with deformation temperature and interval time was developed. Meanwhile, the effect of stain induced precipitation on softening behavior of static recrystallization was analyzed. The results show that the volume fraction of recrystal grains increases with the deformation temperature or the interval time. The static recrystallization behavior is inhibited from the precipitation of fine particles. The activation energy for static recrystallization is determined as 240.47kJ/ mol. The results can be used as the reference for design of the two-stage rolling scheme.
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