采用化学分析、扫描电镜、金相检验和电子探针等方法分析了RCL590F双相钢制造的汽车轮毂在冲压过程中开裂的原因。结果表明:RCL590F钢板厚度中心存在明显的P、Cr、Mn元素偏析,制造轮毂过程中,钢板在冲压应力作用下,中心孔端面出现裂纹并沿偏析区扩展,这是导致汽车轮毂在成型过程中开裂的主要原因。 The causes of cracking of automobile hub made of RCL590F duplex steel during stamping process were analyzed by chemical analysis, scanning electron microscopy, metallographic examination and electron probe. The results show that there is obvious segregation of P, Cr and Mn elements in the center of the thickness of RCL590F steel plate. During the process of manufacturing the hub, cracks occur on the end face of the center hole and expand along the segregation zone under the action of punching stress. The main reason for cracking.