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用Gleeble-3500型热模拟试验机对试验钢进行控轧+直接淬火+快速回火处理的物理模拟,研究了快速加热条件下加热速率对E690海洋用钢的显微硬度、组织、析出物的影响。结果表明,经不同加热速率回火后,试样的显微硬度呈现先升后降趋势,当加热速率为30℃/s时,硬度值达到最大;观察到的SEM形貌无大变化,加热速率对其影响不大;当加热速率为30℃/s时,析出物数量最多,颗粒细小、弥散,沉淀强化效果最强。
The physical simulation of controlled rolling + direct quenching and rapid tempering of the test steel was carried out on a Gleeble-3500 thermal simulation tester. The effects of the heating rate on the microhardness, microstructure, precipitation influences. The results show that the microhardness of the samples first and then decrease after tempering at different heating rates, and reaches the maximum when the heating rate is 30 ℃ / s; The rate has little effect on it; when the heating rate is 30 ℃ / s, the amount of precipitates is the most, the particles are small, dispersed and the precipitation strengthening effect is the strongest.