| Autor: |
N. Grundmann, L. Krüger, P. Trubitz |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Materials Today: Proceedings. 2:S205-S211 |
| ISSN: |
2214-7853 |
| DOI: |
10.1016/j.matpr.2015.05.011 |
| Popis: |
The present study investigates the influence of microstructure and stress ratio on fatigue crack growth in a Ti-6-22-22-S alloy. The alloy's initial state exhibited a bimodal microstructure, and a heat treatment procedure above the β-transus temperature was performed to obtain a fully coarse-grained lamellar microstructure. Pulsating three-point bending tests were conducted at stress ratios of 0.1 and 0.5 on single edge-notched bend (SENB) specimens. It was found that the lamellar microstructure had a higher threshold and a greater crack propagation resistance due to roughness-induced crack closure and secondary extrinsic effects (such as crack deflection and crack branching) in front of the crack tip. The threshold stress intensity factors were determined in accordance with ASTM E 647 and Doker. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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