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- Title
Very high cycle fatigue properties of high-strength spring steel 60SiCrV7.
- Authors
Hui, W. J.; Zhou, C.; Zhang, Y. J.; Zhao, X. L.; Dong, H.
- Abstract
The very high cycle fatigue properties of spring steel 60SiCrV7 for automotive suspension system with different hydrogen contents were studied by using ultrasonic fatigue testing and fatigue crack growth testing. The results show that the S-N curves exhibit continuous drop of fatigue lives and no obvious horizontal line exists. Similar fracture surface features were observed for all the specimens that failed mainly from internal inclusions with surrounding granular bright facet (GBF). Fatigue strength decreases remarkably with increasing hydrogen content. The applied stress intensity factor range at the periphery of GBF Δ KGBF is approximately proportional to 1/3 power of the square of GBF area. The average values of Δ KGBF for uncharged specimens are close to crack growth threshold Δ Kth, which indicates that Δ KGBF could be regarded as the threshold value governing the beginning of stable fatigue crack propagation. The increase of hydrogen content tends to reduce Δ KGBF.
- Subjects
STEEL fatigue; METAL fatigue; ULTRASONIC imaging; HYDROGEN; FATIGUE cracks
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2016, Vol 39, Issue 9, p1081
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12409