摘要
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。
By using the technique of observation in situ under scanning electron microscope, it was found that under tensile loading the G-m interfacial crack formed in the early stage was followed by many interfacial cracks nucleating again gradually instead of its continuously propagating to form a main crack directly The matrix ligaments between interfacial cracks, theerfore, narrowed and deformed to join the interfacial cracks together These happened only within the micro zone of main crack before cracking and the narrow micro zone adjacent to main crack Based on an estimate, most fractograph or surface crack is of the G-m interfacial crack instead of the transgrainular fracture of the matrix ligament According to that, a new explanation of the relation between G and properties in grey cast iron is proposed
出处
《福州大学学报(自然科学版)》
CAS
CSCD
1998年第2期66-70,共5页
Journal of Fuzhou University(Natural Science Edition)
基金
福建省科委资金
关键词
灰口铁
组织
力学性能
断裂
grey cast iron
microstructure
mechanical properties