【作者】 黄新跃； 吴学仁； 徐曼琼； 李旭东； 曲士昱； 刘天琦；

【Author】 Xinyue Huang~1,Xueren Wu~1,Manqiong Xu~2,Xudong Li~1,Shiyu Qu~1,and Tianqi Liu~1 1 Beijing Institute of Aeronautical Materials,Beijing 100095,China; 2 College of Astronautics and Aeronautics,Tsinghua University,Beijing 100084,China

【机构】 北京航空材料研究院； 清华大学航天航空学院；

【摘要】 通过扫描电镜原位疲劳试验,研究了一种Cr-Mn-Si-Ni高强钢疲劳裂纹起始行为,观察并记录了从滑移带自然萌生的小裂纹和其发展到宏观裂纹的过程。研究发现,在低周疲劳情况下,微裂纹在疲劳早期即已萌生,但是裂纹发展很慢,导致失效的裂纹快速扩展发生在疲劳晚期。本文还给出了微裂纹长度与循环数的关系。更多还原

【Abstract】 The fatigue crack initiation behavior of a Cr-Mn-Si-Ni high strength steel is studied with scanning electronic microscope(SEM) in-situ fatigue test.The evolution process of macrocrack formation from naturally nucleated microcracks was recorded.From the observation on specimen surface,it is found that the microcracks nucleated at early fatigue life do not propagate much during most fatigue life.The macrocrack formation and fast propagation occurs at quite late fatigue life.The relations between microcrack length and the number of cycles are given.更多还原