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An analysis of isothermal, bithermal, and thermomechanical fatigue data of Haynes 188 and B1900+Hf by energy considerations

Technical Report ·
OSTI ID:7198937
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The low-cycle fatigue behavior of Haynes 188 and B1900+Hf under isothermal, bithermal, and thermomechanical loading conditions has been analyzed on the basis of the total hysteresis energy expended per cycle. It has been observed that in the case of isothermal fatigue the total hysteresis energy correlates well with the fatigue life. In the case of bithermal 'high rate' fatigue, for a given total hysteresis energy per cycle, the fatigue life is equal to or greater than the isothermal fatigue life at the maximum bithermal temperature. This observation could be used to establish a lower bound on life for design purposes. In one case of bithermal creep-fatigue and in thermomechanical fatigue, the life is shorter than that corresponding to the isothermal life at the maximum temperature. The energy supplied, per se, may not always give a systematic correlation with the fatigue life in the cases where time-dependent creep and environmental effects are encountered. Thus, in bithermal creep-fatigue and thermomechanical fatigue, the role of creep and environment and their dependence on the energy supplied have to be properly accounted for before the energy term can be used for life prediction.
Research Organization:
National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
OSTI ID:
7198937
Report Number(s):
N-94-28819; NASA-TM--106359; E--8153; NAS--1.15:106359; CNN: NAS3-25266; RTOP 505-63-5B
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY-CO36CR22NI22W15FE3
ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
CORROSION RESISTANT ALLOYS
FATIGUE
HAYNES 188 ALLOY
HAYNES ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
LANTHANUM ADDITIONS
LANTHANUM ALLOYS
LIFETIME
MATERIALS
MECHANICAL PROPERTIES
RARE EARTH
RARE EARTH ALLOYS
SERVICE LIFE
STRESSES
THERMAL STRESSES