About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Understanding Corrosion-Related Cracking
|
| Presentation Title |
Effect of deposit chemistry on the stress corrosion cracking susceptibility of CMSX-10 at 550°C and 700°C |
| Author(s) |
Fabian Duarte Martinez, Jonathan Leggett, Grant Gibson, Simon Gray, John Nicholls |
| On-Site Speaker (Planned) |
Fabian Duarte Martinez |
| Abstract Scope |
Turbine blades in aero gas turbines can be at risk of stress corrosion cracking (SCC) below 700°C due to the combined effect of sulphur-containing gases, deposits that are ingested into the turbine and the effect of stress. Therefore, understanding the effect of different deposits on the SCC susceptibility of turbine blade materials in the 550-700°C temperature range is crucial. This study has investigated the effect of NaCl, sea salt and 80/20 mole% Na2SO4/K2SO4 on the early stages of crack formation of CMSX-10 at 550°C and 700°C. The results highlight that chlorine containing salts (i.e. NaCl and sea salt) play an important role in accelerating stress corrosion cracking at 550°C. However, at 700°C stress corrosion cracking is accelerated by the mix of sulphates that lead to reduced melting points, where the 80/20 mole% Na2SO4/K2SO4 has shown the highest susceptibility to SCC. |