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Behavior of the scale on a 9.5Cr steel under cyclical deformation of the base metal

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Low cycle fatigue tests have been performed with a 9.5Cr steel at 650°C in air with ramp rates of 7.5 10−8−7.5 10−7 sec−1 and deformation amplitudes of ±1% (R=−1). LCF deformation enhances the uniform scale growth as well as nodule formation. This enhancement is caused by repeated scale cracking in the tensile periods of the LCF cycles. The crack-healing process is very rapid and occurs during the deformation process. These processes lead to the formation of a scale rich in iron, because the chromium content of the alloy is too low for protective scale healing.

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Barbehön, J., Rahmel, A. & Schütze, M. Behavior of the scale on a 9.5Cr steel under cyclical deformation of the base metal. Oxid Met 30, 85–94 (1988). https://doi.org/10.1007/BF00656645

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Key words

  • 9.5Cr steel
  • corrosion-LCF interaction
  • scale cracking
  • healing