The microstructure and fracture morphology of directly etched fracture sample of rail steel were observed. The relatinos between the microstructure and fracture morphology were discussed.

• 在经过腐蚀的钢轨钢拉伸断口上进行了显微组织和断口形貌的同步观察，直接观察到了断日形貌特征与显微组织的某些相关结果。