Fatigue limit and crack growth in ultra-fine grain metals produced by severe plastic deformation
Fatigue limit and crack growth in ultra-fine grain metals produced by severe plastic deformation
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DOI：
10.1007/s10853-006-0973-z
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发表时间：
2007-03
影响因子：
4.5
通讯作者：
A. Vinogradov
中科院分区：
文献类型：
--
作者：
A. Vinogradov
从疲劳极限和疲劳裂纹扩展速率两个主要特征出发，综述了严重塑性变形(SPD)产生的超细晶金属的疲劳抗力实验结果。疲劳极限显著得益于细化到亚微晶尺度的晶粒。结合SPD工艺和产生的超细晶组织，讨论了影响疲劳极限的因素。与疲劳极限相比，与普通多晶相比，SPD后疲劳裂纹扩展门槛值变差。讨论了疲劳裂纹萌生和扩展的可能机制，为提高和优化疲劳性能提供了制造指南。
The experimental results on fatigue resistance of ultra-fine grain metals produced by severe plastic deformation (SPD) are reviewed with regard to two major characteristics of cyclic damage initiation and failure—fatigue limit and fatigue crack growth rate. The fatigue limit benefits considerably from grain refinement down to submicrocrystalline scale. Factors affecting the fatigue limit are discussed in the light of SPD-processing and resultant ultra-fine grain structure. Contrasting with the fatigue limit, the fatigue crack growth threshold deteriorates after SPD in comparison to that of ordinary polycrystals. Possible mechanisms of fatigue crack initiation and propagation are discussed and the guidelines for manufacturing are provided towards enhancement and optimization of fatigue performance.