利用LINSEIS R.I.T.A L78淬火式膨胀仪，测定了高铬锻钢轧辊在1 030℃奥氏体化后以不同速率冷却时的相变膨胀曲线，采用膨胀法结合金相检验和硬度测试测定了高铬锻钢轧辊的临界点温度，用Origin软件绘制了高铬锻钢轧辊的连续冷却转变（CCT）曲线，并对其结果进行了分析。结果表明：高铬锻钢轧辊的CCT曲线上存在珠光体、贝氏体和马氏体3个相变区，且这3个相变区完全分离；当冷却速率≥ 1℃·s^-1时，组织为单一马氏体相变组织，且马氏体转变开始温度M_s随着冷却速率的增大而降低。

The phase transition expansion curve of high chromium forged steel roll after austenitizing at 1 030℃ and cooling at different rates was measured by using LINSEIS R.I.T.A L78 quenching dilatometer. The critical temperatures of the high chromium forged steel roll were determined by dilatometer method combined with metallographic test and hardness test, and the continuous cooling transformation (CCT) curves of the steel was drawn by Origin software, and then the test results were analyzed. The results show that the transformation of pearlite, bainite and martensite occurred in the continuous cooling process and the three phase transition regions were completely separated. When the cooling rate was greater than or equal to 1℃·s^-1, there was only martensite phase transition and the martensite phase transition starting temperature M_s decreased with the increase of cooling rate.