Rotating bending fatigue tests were carried out for Inconel 718 at room temperature and elevated temperatures of 300°C, 500°C and 600°C to investigate the influence of temperature on the fatigue crack growth resistance. The crack growth rate can be expressed by the small crack growth law, dl/dN=C<SUB>1</SUB>σ<SUP>n</SUP><SUB>a</SUB>l=C<SUB>2</SUB>(σ<SUB>a</SUB>/σ<SUB>B</SUB>)<SUP>n</SUP>l, at all the temperatures, where σ<SUB>B</SUB>, σ<SUB>a</SUB> and l are the tensile strength, the stress amplitude and the crack length, and C<SUB>1</SUB>, C<SUB>2</SUB> and n are constants. Therefore, the resistance to crack growth was evaluated using the small crack growth law. The fatigue crack growth resistance decreased with the increase of temperature.
|Translated title of the contribution||Fatigue Crack Growth Resistance in Nickel-Base Superalloy at Elevated Temperatures|
|Number of pages||5|
|Journal||Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|Publication status||Published - Nov 25 1997|