The Relationship between Fatigue Properties and Microstructures in Rolled Metal Film
The Relationship between Fatigue Properties and Microstructures in Rolled Metal Film
复制标题
轧制金属薄膜疲劳性能与微观结构的关系
DOI：
10.1299/jsmea.45.504
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
T. Torii
中科院分区：
文献类型：
--
作者：
K. Shimizu;T. Torii
采用轧制方向与加载方向平行和垂直的两种试样进行薄膜疲劳试验，探讨了轧制织构对100µm铁薄膜疲劳裂纹扩展性能的影响及其与晶粒尺寸的关系。电子后向散射衍射（EBSD）晶体学分析表明，在873K和1173K退火的薄膜中，滚动织构的各向异性仍然存在。在873K退火时，晶粒尺寸较小的薄膜裂纹沿晶界扩展，平行和垂直于轧制方向的加载方向裂纹扩展速率基本相同。另一方面，在1173K退火时，晶粒尺寸较大的薄膜中的裂纹沿晶粒扩展，且裂纹沿垂直方向的扩展速度比沿平行方向的扩展速度慢。这可能是因为在1173K退火的铁膜中，同一晶粒的轧制织构根据轧制方向与裂纹扩展方向的关系，其滑移系统不同。在1173K退火后，沿垂直于轧制方向扩展的疲劳裂纹周围的轧制织构发生了明显的扭转。
Using two types of specimen that rolling direction was parallel and perpendicular to loading direction in film fatigue testing, effects of rolling texture on fatigue crack propagation properties in iron films of 100µm were discussed in relation with the grain size. A crystallographic analysis by EBSD (Electron Backscatter Diffraction) method showed that the anisotropy of rolling texture remained even in the films annealed at 873K and 1173K. The cracks in the film with the smaller grain size annealed at 873K propagated along the grain boundary and the crack propagation rate is approximately the same for both loading direction parallel and perpendicular to the rolling direction. On the other hand, the cracks in the film with the larger grain size annealed at 1173K propagated across the grain and the crack propagated slower toward the perpendicular direction to the rolling direction than toward the parallel direction. This is probably because the slip system of the rolling texture in a grain of the iron film annealed at 1173K is different in accordance with the relationship between rolling direction and crack propagation direction. Also, the rolling texture was outstandingly turned around the fatigue crack propagated perpendicular to the rolling direction in the film annealed at 1173K.