电镜断口特征与裂纹扩展速率的研究  

A STUDY ON FEATURES OF SEM FRACTGRAPH AND FATIGUE-CRACK GROWTH RATES

作　　者：李善春[1] 许德才[1] 赵芳璧[2] 潘秉智 

机构地区：[1]大庆油田化学助剂厂 [2]大庆石油学院机械系

出　　处：《东北石油大学学报》1991年第4期56-62,共7页Journal of Northeast Petroleum University

摘　　要：试验研究了16MnR球形容器外表面的焊缝裂纹、热影响区裂纹、母材裂纹的疲劳扩展行为,结合电镜断口特征分析其表面裂纹的开裂及其扩展机理,用Paris方程描述了在低周疲劳循环条件下表面裂纹的扩展规律,并将微观分析与宏观分析结果进行了对比分析。试验结果为压力容器安全评定及其寿命预测提供了可靠的依据。In this paper, the propagation behaviour of outer surface cracks in welded joints, heat-affected zones or matrixes of spherical pressure ves- sels is studied. Accordihg to the features of SEM fractgraph, the initia- tion of surface cracks and their propagation machanism are analyzed and the relationship of micro results and matro results is contrasted. The test conclusions present a reliable foundation for the safc assessment and prediction of its life of pressure vessels.

关 键 词：疲劳裂纹 电镜断口特征 金相组织 疲劳条纹 裂纹扩展速率 

分 类 号：TH49[机械工程—机械制造及自动化]