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The parameters C and ΔKT for several structural alloys as a function of temperature between room temperature and 811 K had been analyzed. It was found that the “fatigue tolerance range” ΔKT decreased linearly with increasing temperature. Initially, the parameter C increases nearly linearly with increasing temperature and then increases steeply at higher temperatures. In the present work, this temperature dependence is shown to be found between 4 and 911 K by analyzing low-temperature as well as additional high-temperature data for Inconel 718 and Inconel X-750. By assuming the observed qualitative temperature dependence of C and ΔKT as being correct, available fatigue crack growth rates for Type 304 stainless steel obtained at temperatures ranging from 4 to 922 K were analyzed with respect to C and ΔKT.
fatigue, crack growth rates, Inconel 718, Inconel X-750, Type 304 stainless steel, temperature effect, material parameters
DFVLR—German Aerospace Establishment, Institut für Werkstoff-Forschung, Cologne,