Advances in Deformation Behaviour of P91 Steel under Creep-Fatigue Interaction
P91 steel is widely used in steam pipelines of thermal power units.In recent years,the peak-loading regulation leads to the creep-fatigue interaction of pipeline components,and the components often fail earlier than their life expectancy.In view of this problem,the research results and progress of P91 steel in mechanical response,microstructure evolution and crack initiation,propagation law under creep-fatigue interaction were reviewed.Firstly,by comparing the creep-fatigue loading methods under different conditions,the microstructure evolution law of the material in the process of the creep-fatigue deformation was discussed.Finally,the initiation and propagation behaviour of microcracks in P91 steel was expounded according to different external service conditions,such as load retention time,loading frequency,the relationship between average stress and stress amplitude.
creep-fatigue interactionP91 steelmicrostructure evolutioncrack initiation and propagation behaviour
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