用扫描电镜原位观察技术，发现拉伸早期形成的Ｇ－ｍ界面断裂并不是直接连续扩展成主裂纹，而是逐步再生许多界面裂纹，其间基体韧带缩小而形变裂开将界面裂纹连接起来这些过程局限在裂开前主裂纹及其近邻处很窄的微带区内进行在断口或表面裂纹中，Ｇ－ｍ界面断裂占绝大部份，基体韧带的穿晶断裂只占很少基此对灰口铸铁中石墨与性能关系提出了新的解释 Using in-situ scanning electron microscopy observation, it was found that the G-m interface fracture formed in the early stretch did not directly extend into the main crack directly, but gradually regenerated many interface cracks, during which the ligament of the base was narrowed and the deformation cracked and connected the interface cracks. These processes are confined to the pre-crack primary crack and its narrow neighbors in the microstrip zone  fracture or surface cracks in the G-m interface fracture accounted for most of the basement ligament transgranular fracture only a small  Based on this gray cast iron in graphite and the relationship between the performance of a new explanation 