航空用超高强度钢中夹杂物导致疲劳裂纹萌生与扩展的微观行为

钢铁, 2007, 42(7): 72-0.

航空用超高强度钢中夹杂物导致疲劳裂纹萌生与扩展的微观行为

1.1. 北京科技大学高温合金研究室，北京 100083；2. 清华大学工程力学系，北京 100084

1.1. High Temperature Materials Research Laboratories, University of Science and Technology Beijing, Beijing 100083, China

2.2. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

关键词：超高强度钢;夹杂物;裂纹萌生和扩展;断裂

Study on Inclusion Induced Fatigue Crack Initiation and Propagation in UltraHigh Strength Steel for Aerospace Application

FAN Hongmei , ZENG Yanping , WANG Xishu , CUI Zhengqiang , XIE Xishan

Keywords： ultrahigh strength steel;inclusion;crack initiation and propagation;fracture

采用扫描电镜原位观测的方法，跟踪观察了低周疲劳载荷下航空用超高强度钢MA250中夹杂物导致裂纹萌生与扩展的微观行为，得到了MA250钢低周疲劳裂纹萌生与扩展的基本特性，讨论了精确测定MA250钢疲劳裂纹扩展速率的方法。

The microbehavior of inclusion inducing crack initiation and propagation in ultrahigh strength steel MA250 for aerospace application under low cyclic fatigue loading was studied by means of SEM original position observation. The characteristics of low cyclic fatigue crack initiation and propagation were obtained. The method for accurately measuring fatigue crack growth rate in MA250 is discussed.

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