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<p>Turbine blades of aerogas turbines can be at risk of stress corrosion cracking (SCC) below 700&#xa0;°C due to the effects of stress, sulphur-containing gases and deposits that are ingested into the turbine. Therefore, understanding the effect of different deposits on the SCC susceptibility of single-crystal nickel-based superalloys at different temperatures is crucial. This study investigated the effect of NaCl, sea salt and 80/20&#xa0;mol% Na<sub>2</sub>SO<sub>4</sub>/K<sub>2</sub>SO<sub>4</sub> on the SCC susceptibility of CMSX-10 at 550&#xa0;°C and 700&#xa0;°C. The results suggest that chlorine-containing salts play an important role in accelerating stress corrosion cracking at 550&#xa0;°C, where the formation of HCl leads to the breaking down of the oxide and exposing the base alloy to a sulphidation environment. At 700&#xa0;°C stress corrosion cracking is accelerated by the mix of sulphates that lead to reduced melting points, where the 80/20&#xa0;mol% Na<sub>2</sub>SO<sub>4</sub>/K<sub>2</sub>SO<sub>4</sub> has shown the highest susceptibility to SCC.</p>

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Effect of Deposit Chemistry on the Stress Corrosion Cracking Susceptibility of CMSX-10 at 550°C and 700°C

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月20日

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  • F. Duarte Martinez,
  • A. Syed,
  • G. Gibson,
  • J. Leggett,
  • J. C. Mason-Flucke,
  • J. R. Nicholls,
  • S. Gray

摘要

Turbine blades of aerogas turbines can be at risk of stress corrosion cracking (SCC) below 700 °C due to the effects of stress, sulphur-containing gases and deposits that are ingested into the turbine. Therefore, understanding the effect of different deposits on the SCC susceptibility of single-crystal nickel-based superalloys at different temperatures is crucial. This study investigated the effect of NaCl, sea salt and 80/20 mol% Na2SO4/K2SO4 on the SCC susceptibility of CMSX-10 at 550 °C and 700 °C. The results suggest that chlorine-containing salts play an important role in accelerating stress corrosion cracking at 550 °C, where the formation of HCl leads to the breaking down of the oxide and exposing the base alloy to a sulphidation environment. At 700 °C stress corrosion cracking is accelerated by the mix of sulphates that lead to reduced melting points, where the 80/20 mol% Na2SO4/K2SO4 has shown the highest susceptibility to SCC.