The relationship between cyclic stress–strain curve and dislocation structures in cyclically deformed IF steel
✍ Scribed by Chia-Chang Shih; New-Jin Ho; Hsing-Lu Huang
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 775 KB
- Volume
- 517
- Category
- Article
- ISSN
- 0921-5093
No coin nor oath required. For personal study only.
✦ Synopsis
The cyclic stress-strain curve (CSSC) of cyclically deformed polycrystalline interstitial-free steels (IF steel), divided into regions A, B and C, have been correlated with the fatigue test conditions. No dislocation arrangement can be found when plastic strain amplitude is controlled in region A. For region B as revealed as a plateau, the plastic strain amplitude is located in the range between ε pl = 7.5 × 10 -5 ( ε/2 = 0.05%) and ε pl = 5 × 10 -4 ( ε/2 = 0.1%). Loop patches prevail in region B. If the strain amplitude is close to the upper limit of the region B, the loop-patch structure is also predominant in the dislocation structures despite the existence of dislocation walls and a few dislocation cells larger than 2 m. However, these structures have no significant effect on fatigue failure. The dislocation cells rapidly developed once the plastic strain amplitude is elevated into region C.