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Abstract

Against the background of the evolution of fatigue damage at ambient temperature, the present paper reviews the damage processes in high-temperature engineering alloys at elevated temperatures, drawing - where possible - on results obtained in the framework of COST 50 and COST 501. Damage is defined in its broadest sense as any irreversible change which degrades the material's resistance to fatigue. Hence, the paper considers the bulk and the localized damage modes which consecutively appear with evolving life fraction, including dislocation substructures, microcrack nucleation, microcrack extension and macrocrack growth. The operation of time dependent deformation, environmental attack and microstructural instabilities at elevated temperatures modifies the damage response of the material to cyclic loading. The paper reviews the effect of these time dependent processes on the deformation mechanisms, on the damage modes and on the damage rates, with a particular emphasis on the influence of the environmental attack.

Additional information

Authors: BRESSERS J JRC - PETTEN ESTAB. (THE NETHERLANDS) REMY L CENTRE DES MATERIAUX, ECOLE NATIONALE SUPERIEURE DES MINES DE PARIS, EVRY (FRANCE) HOFFELNER W BROWN BOVERI, MAT. ENG. GAS TURBINES, BADEN (SWITZERLAND) , JRC - PETTEN ESTAB. (THE NETHERLANDS);CENTRE DES MATERIAUX, ECOLE NATIONALE SUPERIEURE DES MINES DE PARIS, EVRY (FRANCE);BROWN BOVERI, MAT. ENG. GAS TURBINES, BADEN (SWITZERLAND)
Bibliographic Reference: HIGH TEMPERATURE ALLOYS FOR GAS TURBINES AND OTHER APPLICATIONS 1986, LIEGE (BELGIUM), OCT. 6-9, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32763 ORA
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