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利用膨胀法并结合金相法和硬度法,在Gleeble-1500D热模拟试验机上测定了贝氏体钢轨钢的连续冷却转变曲线,分析了不同冷速条件下的显微组织转变情况,并研究了冷却速度与硬度变化的关系。结果表明,实际生产中冷速控制在0.8~2.0℃/s内,可获得全部的贝氏体组织;贝氏体钢轨钢的硬度随冷却速度的增大,大体上呈逐渐增大的趋势变化。
The continuous cooling transformation curves of bainitic rail steel were measured on the Gleeble-1500D thermal simulation tester by means of expansion method combined with the metallographic method and hardness method. The microstructure transformation under different cooling rates was analyzed. The cooling rate And the relationship between hardness changes. The results show that all the bainite structure can be obtained by controlling the cooling rate in the range of 0.8 ~ 2.0 ℃ / s in actual production. The hardness of bainitic rail steel increases with the increase of cooling rate, .