MAR-M 302 a Co-base superalloy is currently
used for nozzle guide vanes and stator blades in military
and commercial aircraft-turbine engines. These components are usually operated at 1073–1273 K. In this study,
the uniaxial constant load creep behavior of MAR-M 302
superalloy over temperature range of 1088–1198 K and
stress range of 155–321 MPa was investigated. Concerning
creep as thermally activated phenomenon, the investigated
alloy followed empirical equation e_ ¼ Arn exp Q
RT with
n values ranging mainly from 7 to 10. The mean apparent
activation energy was calculated as 525 ± 29 kJ/mol. The
correlation between rupture life and creep characteristics
was studied by different prediction methods that are based
on the iso-stress lines and those relating the secondary or
steady state creep rate to rupture life.