| 利用扫描电镜动态研究3Cr2W8V钢热疲劳裂纹的萌生 |
| |
| 引用本文： | 刘剑虹,冯晓曾,张德福.利用扫描电镜动态研究3Cr2W8V钢热疲劳裂纹的萌生[J].安徽工学院学报,1988(2). |
| |
| 作者姓名： | 刘剑虹 冯晓曾 张德福 |
| |
| 作者单位： | 哈尔滨工业大学，哈尔滨工业大学，国营华安机械厂 |
| |
| 摘 要： | 利用自制的Coffin型热疲劳载物台,对3Cr2W8V钢微型试样进行了扫描电镜中的动态热疲劳试验。拍摄了热疲劳裂纹的形核、成长、连接过程。对3Cr2W8V钢热疲劳裂纹的萌生机制进行了讨论。指出热疲劳裂纹优先于界面碳化物链处形核,并在滑移的促进下沿滑移线场最大切应力方向成长。
|
| 关 键 词： | 热疲劳 裂纹萌生 机制 |
A STUDY OF THE NUCLEATION OF DYNAMIC THERMAL FATIGUE CRACK ON THE 3Cr2W8V STEEL IN SEM |
| |
| Authors: | Liu Jianhong Feng Xiaozeng Zhang Defu Haerbin Institute of Technology Huaan Mechanical Factory |
| |
| Affiliation: | Liu Jianhong;Feng Xiaozeng;Zhang Defu Haerbin Institute of Technology Huaan Mechanical Factory |
| |
| Abstract: | Dynamic thermal fatigue of the micro specimens of 3Cr2W8V steel is carriedout in SEM with self-made Coffin model thermal fatigue stage. The nucleati-on, growth and connection of fatigue cracks were photographed. The mechanismsof fatigue crack initiation were discussed. It is suggested that thermal fatiguecracks nucleate preferentially at carbide chains along interface and propagate byslipping in the direction of maximum shearing stress along slip lines. |
| |
| Keywords: | thermal fatigue crack initiation mechanism |
| 本文献已被 CNKI 等数据库收录！ |
