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Book cover of Thermal Fatigue of Ductile Materials

Thermal Fatigue of Ductile Materials

2 - Effect of Cyclic Thermal Stressing on the Stress-rupture Life and Ductility of S-816 and Inconel 550

by Francis J. Clauss ยท 1958

ISBN:  Unavailable

Category: Unavailable

Page count: 43

Exposure to thermal-fatigue conditions strengthened S-816 in stress rupture and weakened Inconel 550. Under the most damaging contitions studied, Inconel 550 lost 98 percent of its original stress-rupture life as a result of prior thermal fatigue, even though the number of cycles was only one-half of that required for failure by thermal fatigue alone. The stress-rupture life of S-816 was increased by about 50 percent. When specimens were first exposed to stress-rupture conditions and then run to failure in thermal fatigue, the thermal-fatigue life of S-816 was sharply reduced, whereas that of Inconel 550 showed a slight increase. The results can be interpreted by extending existing theories of mechanical fatigue and creep-rupture to thermal fatigue.