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在Formastor-F试验机上进行热模拟试验,采用膨胀法测定了耐蚀钢轨U68CuCr临界点及在0.1～5.0℃/s的冷却速度下连续冷却的温度膨胀曲线,结合微观组织和显微维氏硬度分析,采用Origin软件绘制出连续冷却转变(CCT)曲线。试验结果表明,耐蚀钢轨U68CuCr冷却速度不超过0.1℃/s时,可获得索氏体+珠光体组织;冷却速度达到2.0℃/s时,钢中出现马氏体组织;当冷却速度达到5.0℃/s时,得到片间距更细小的屈氏体组织,过冷奥氏体转变为马氏体+屈氏体组织。根据连续冷却转变曲线,为优化耐蚀钢轨轧后冷却工艺提供理论依据。
The thermal simulation test was carried out on the Formastor-F testing machine. The temperature expansion curve of the U68CuCr critical point of the corrosion resistant rail and the continuous cooling at the cooling rate of 0.1-5.0 ℃ / s were measured by the dilatometric method. The microstructure and micro Vickers hardness Analysis, using Origin software to draw a continuous cooling transition (CCT) curve. The test results show that sorbite + pearlite can be obtained when the corrosion rate of U68CuCr steel does not exceed 0.1 ℃ / s. When the cooling rate reaches 2.0 ℃ / s, martensite appears in the steel. When the cooling rate reaches 5.0 ℃ / s, the finer intermetallics were obtained, and the supercooled austenite transformed to martensite + troostite. According to the continuous cooling transformation curve, to provide a theoretical basis for optimizing the cooling process of the rail after rolling.