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<p>This paper characterises fatigue behaviour of alloy RR1073 at 700&#xa0;°C in air, and in air containing SO<sub>2</sub>, with deposits of a Na<sub>2</sub>SO<sub>4</sub>, or a NaCl-based salt. Such understanding is necessary as these compounds are ingested in aircraft engines and can be deposited onto disc rim surfaces. Fatigue tests were conducted on round bar test pieces using fully reversed, saw-tooth fatigue cycles. Preliminary tests found that a 3 seconds cycle ramp time from minimum to maximum load produced very similar corrosion-fatigue morphology to that observed for ex-service discs, from conditions of 300&#xa0;ppm SO<sub>2</sub> in air with 0.13&#xa0;mg/cm<sup>2</sup> of 98 pct Na<sub>2</sub>SO<sub>4</sub> and 2 pct NaCl salt. Subsequent fatigue tests were conducted with different corrosion conditions in terms of SO<sub>2</sub>, salt composition and concentration. Fatigue lives that were approximately 30 pct of those in air were produced if a sufficient supply of SO<sub>3</sub> was present with a Na-based salt. This was achieved with (i) SO<sub>2</sub> and a Na<sub>2</sub>SO<sub>4</sub> or a NaCl-based salt, and (ii) without SO<sub>2</sub> but with high levels of a Na<sub>2</sub>SO<sub>4</sub>-based salt. Electron microscopy showed subtle differences in surface damage from (i) to (ii). Damage evolution is reported from interrupting tests at fractions of the fatigue life.</p>

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Characterising the Effect of Environment and Salt Concentration on the Fatigue Life of a Nickel Disc Alloy

  • 期刊论文

  • 发表日期：

    2026年3月14日

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  • M. C. Hardy,
  • Y. Li,
  • C. Rodenkirchen,
  • S. Gray,
  • C. Jackson,
  • P. M. Mignanelli,
  • H. Cockings,
  • H. Davies,
  • S. Pedrazzini

摘要

This paper characterises fatigue behaviour of alloy RR1073 at 700 °C in air, and in air containing SO2, with deposits of a Na2SO4, or a NaCl-based salt. Such understanding is necessary as these compounds are ingested in aircraft engines and can be deposited onto disc rim surfaces. Fatigue tests were conducted on round bar test pieces using fully reversed, saw-tooth fatigue cycles. Preliminary tests found that a 3 seconds cycle ramp time from minimum to maximum load produced very similar corrosion-fatigue morphology to that observed for ex-service discs, from conditions of 300 ppm SO2 in air with 0.13 mg/cm2 of 98 pct Na2SO4 and 2 pct NaCl salt. Subsequent fatigue tests were conducted with different corrosion conditions in terms of SO2, salt composition and concentration. Fatigue lives that were approximately 30 pct of those in air were produced if a sufficient supply of SO3 was present with a Na-based salt. This was achieved with (i) SO2 and a Na2SO4 or a NaCl-based salt, and (ii) without SO2 but with high levels of a Na2SO4-based salt. Electron microscopy showed subtle differences in surface damage from (i) to (ii). Damage evolution is reported from interrupting tests at fractions of the fatigue life.