EFFECT OF CYCLIC STRESS ON CREEP RUPTURE STRENGTH OF A CAST SUPERALLOY WITH HIGH Al AND Ti CONTENTS

The effect of cyclic stress on the strength of creep rupture and recurrent creep rupture as well as low cycle fatigue of a cast nickel-base superalloy with high Al and Ti contents has been studied under different temperature and stress. It was found that the temperature is the main factor influenced upon the creepfatigue interaction. There are three temperature ranges leading to damage of creep, fatigue or combination of creep-fatigue individuaUy. The tested results were identified by some SEM fractographs.