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通过Gleeble3500热模拟试验机测定GCr15钢在升温和降温时的膨胀曲线,并结合Origin8.0软件分析技术分析膨胀曲线,采用切线法采集数据;结合不同温度等温水冷实验试样碳化物形貌和试样的洛氏硬度,确定离异共析转变温度。实验结果表明:GCr15钢加热到840/℃保温5分钟,然后以1℃/s的速度冷却,加热时的共析转变开始温度为756℃,结束温度为807℃;冷却时共析转变开始温度为743℃,结束温度为644℃;GCr15钢在805℃保温30分钟后,在715℃以上的共析转变为离异共析转变,645℃等温开始出现片状珠光体。
By Gleeble3500 thermal simulation test machine GCr15 steel in the heating and cooling when the expansion curve, combined with Origin8.0 software analysis of the expansion curve, the use of tangent method to collect data; combined with different temperature isothermal water cooling test specimen carbide morphology and Rockwell hardness of the sample to determine the eutectoid transformation temperature. The experimental results show that the GCr15 steel is heated to 840 / ℃ for 5 minutes and then cooled at 1 ℃ / s. The eutectoid transformation start temperature is 756 ℃ and the finish temperature is 807 ℃. The eutectoid transformation start temperature 743 ℃, the end temperature of 644 ℃; GCr15 steel at 805 ℃ incubated for 30 minutes, the eutectoid transformation of more than 715 ℃ into dissociation eutectoid transformation, 645 ℃ isothermal flaky pearlite began to appear.