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采用Gleeble-1500D热模拟试验机测定了试验钢的动态连续冷却转变曲线,结合国内某厂热连轧带钢的具体轧制条件,制定了多道次轧制工艺,研究了冷却方式对稀土微合金高强度钢组织的影响。结果表明:试验钢的室温组织为铁素体+贝氏体双相组织,冷却速度在5~25℃/s范围内试验钢均可得到铁素体,铁素体含量约为30%,其平均尺寸约为15μm左右;试验钢选择在铁素体区冷却,冷却速度为10℃/s左右,可以得到细小均匀的铁素体+贝氏体双相组织,其中铁素体含量约为29%,平均尺寸为13μm。
The dynamic continuous cooling transformation curve of the test steel was measured by the Gleeble-1500D thermal simulation test machine. Combined with the specific rolling conditions of the hot strip in a certain factory in China, a multi-pass rolling process was developed. The effect of cooling mode on the rare earth micro Effect of Alloy High Strength Steel Structure. The results show that the microstructure of the test steel is ferrite + bainite at room temperature. When the cooling rate is in the range of 5-25 ℃ / s, the ferrite can be obtained in the test steel. The content of ferrite is about 30% The average size of about 15μm; test steel was selected in the ferrite cooling zone, the cooling rate of about 10 ℃ / s, you can get a fine uniform ferrite + bainite duplex structure, in which the ferrite content of about 29 %, The average size of 13μm.