Impact of Temperature on Low-Cycle Fatigue Characteristics of the HR6W Alloy

This paper presents the results of tests conducted on the HR6W (23Cr-45Ni-6W-Nb-Ti-B) alloy under low-cycle fatigue at room temperature and at 650 & DEG;C. Fatigue tests were carried out at constant values of the total strain ranges. The alloy under low-cycle fatigue showed cyclic strengthening both at room temperature and at 650 & DEG;C. The degree of HR6W strengthening described by coefficient n' was higher at higher temperatures. At the same time, its fatigue life N-f at room temperature was, depending on the range of total strain adopted in the tests, several times higher than observed at 650 & DEG;C.