Thermomechanical fatigue, oxidation, and Creep: Part II. Life prediction

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A life prediction model is developed for crack nucleation and early crack growth based on fatigue, environment (oxidation), and creep damage. The model handles different strain-temperature phasings (i.e., in-phase and out-of-phase thermomechanical fatigue, isothermal fatigue, and others, including nonproportional phasings). Fatigue life predictions compare favorably with experiments in 1070 steel for a wide range of test conditions and strain-temperature phasings. An oxide growth (oxide damage) model is based on the repeated microrupture process of oxide observed from microscopic measurements. A creep damage expression, which is stress-based, is coupled with a unified constitutive equation. A set of interrupted tests was performed to provide valuable damage progression information. Tests were performed in air and in helium atmospheres to isolate creep damage from oxidation damage.

Original languageEnglish (US)
Pages (from-to)1769-1783
Number of pages15
JournalMetallurgical Transactions A
Issue number9
StatePublished - Sep 1989

ASJC Scopus subject areas

  • Engineering(all)


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