| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Stress Corrosion Cracking Assisted by Oxygen Embrittlement in Ti-6246 |
| Author(s) |
Yitong Shi, Sudha Joseph, Paraskevas Kontis, Yanhong Chang, Baptiste Gault, David Dye |
| On-Site Speaker (Planned) |
Yitong Shi |
| Abstract Scope |
In this work, two-point bend tests on Ti-6Al-2Sn-4Zr-6Mo were conducted at elevated temperatures and controlled environment to examine the susceptibility to hot salt stress corrosion cracking (HSSCC) by NaCl via adding a droplet of NaCl salt solution (0.1g /100ml) on the top of sample surface. The testing environment consisted of 0.2 bar O2 and 0.8 bar labelled water vapour D218O. Atom probe tomography study on the crack tip of sample tested under 450 ° C/ 650MPa showed a significant concentration of 18O in the alpha phase. The analysis by electron energy loss spectroscopy (EELS) equipped in TEM also revealed the high oxygen content around dislocations in beta phase. It was proposed that the oxygen atoms charging into the crack tip through corrosion reactions could give rise to enhanced plasticity ahead of crack tip and assist crack propagation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |