Abstract
Abstract The literature reporting on comparative studies of fatigue life and fatigue crack growth rates in oxidizing environment and vacuum has been reviewed. The emphasis has been on the properties of steel, nickel and super alloys at elevated temperature. A number of effects emerge: (i) The crack growth in air is an order of magnitude faster than in vacuum; (ii) There is a stepwise or gradual transition from vacuum behaviour to air behaviour between approx. 10−6 and 1 torr; (iii) The apparent activation energy for the oxidation effect on crack growth rate is small, less than 10 kcal mole−1; (iv) Oxidation promotes intergranular cracking but also accelerates transgranular cracking; (v) The frequency dependent is stronger in oxidation environment than in vacuum, but is also present in vacuum; (vi) The oxidation effect disappears at high strain amplitudes NF < 102...
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