1裂纹现象热裂纹是在轧制过程中在轧辊的表面生成的散布或局部的裂纹。图1、图2显示了轧辊下机后上述缺陷的表现形式。图1纵向热裂纹图2局部热裂纹典型的热裂纹形式如图3所示。图3典型热裂纹形式图4是热裂纹在热轧精轧机组无限冷硬铸铁轧辊和高速钢轧辊表面沿径向的扩展情形。( 1 Crack phenomenon Hot cracks in the rolling process in the surface of the roll generated scattered or local cracks. Figure 1, Figure 2 shows the form of the above defects after the roll off the machine. Fig.1 Longitudinal thermal crackFig.2 The typical thermal crack of local thermal crack is shown in Fig.3. Figure 3 shows the typical form of hot crack. Figure 4 shows the thermal crack propagation along the radial direction on the surface of infinite chilled cast iron roll and high speed steel roll in hot strip mill. (