Experimental analysis reveals reduced fatigue strength in nickel superalloys under salt exposure and sulphur dioxide, indicating environmental impact on performance.
The fatigue performance of a recently developed nickel superalloy disc was investigated at 700 °C in two environments: air and sulphur dioxide (SO2). Prior to testing, specimens were coated with various amounts of sodium sulphate (Na2SO4) and sodium chloride (NaCl) mixed salt (98% Na2SO4 + 2% NaCl), and the influence of both environment and salt loading on corrosion fatigue were assessed. Preliminary results showed that salt exposure in air reduced fatigue strength, with greater damage at higher salt levels. In the SO2 environment, fatigue strength dropped even more due to low-temperature hot corrosion (LTHC). The details of the corrosion morphology formed in both air and SO2 environments are discussed.
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Li et al. (2025) studied this question.
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