INFLUENCE OF TEMPERATURE ON FATIGUE CREEP INTERACTION FRACTURE MAP

Abstract

Abstract: The relative ratio of fatigue resistance to creep resistance of materials varies with test temper- ature.As the temperature decreases,the creep resistance,since it is a thermal activation pro- cess,becomes relatively larger than fatigue resistance.Therefore the fatigue damage becomes predominant,and results in expansion of fatigue fracture region(region F),and shrinkage even complete elimination of creep fracture region(region C).A materials parameter Ω can be defined to estimate the temperature at which the creep fracture region is completely de- pressed.This phenomenon could be understood on the basis of the integrated model of compet- itive and cumulative models of fatigue creep interaction.

Key words: creep fracture, fatigue, fatigue creep interaction, superaUoy

ZHANG Hongxue XU Zhichao CHEN Guoliang University of Science and Technology Beijing,Beijing,China Professor,Faculty of Superalloy,University of Science and Technology Beijing,Beijing,China. INFLUENCE OF TEMPERATURE ON FATIGUE CREEP INTERACTION FRACTURE MAP[J]. Acta Metallurgica Sinica (English Letters), 1989, 2(3): 215-218.

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INFLUENCE OF TEMPERATURE ON FATIGUE CREEP INTERACTION FRACTURE MAP

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