HRB400E吐丝后的冷却过程决定了其微观组织组成。通过Gleeble-3500热模拟试验机模拟了HRB400E不同的冷却工艺，分析了不同冷却工艺条件下的膨胀量曲线和微观组织。试验结果表明：冷却速率和冷却速率突变温度对试验钢的最终组织组成有非常大的影响，2个参数的合理搭配，可以控制得到一定数量的贝氏体；贝氏体体积分数随突变温度的降低和冷却速率的提高呈现上升的趋势。
The microstructure of HRB400E was decided by the cooling process after laying. The different cooling pro-cesses were simulated by Gleeble-3500 thermal simulation tester. The dilatometric curve and microstructure were ana-lyzed under different cooling processes. The results indicate that the cooling rate and mutational temperature greatly influ-enced the final microstructure. The rational cooperation of these two parameters could dominate the fraction of bainite. With the increasing of cooling rate and decreasing of mutational temperature,the fraction of bainite enhanced.
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