Abstract

Ihe objective of this work was to investigate the high temperature low cycle fatigue properties of a mechanically alloyed and oxide dispersion strengthened N&base superalloy MA 760. The push-pull fatigue tests at d&rent strain rates using specimens of two ditferent gram orientations (longitudinal, L and long transverse, LT) were carried out at temperatures of 650 ‘C, 950 ‘C and 1050 “C. The control parameter in all tests was the total strain amplitude. Atler the tests, detailed fractographical and microshuctural studies using optical microscopy, scanning electron microscopy and analytical electron microscopy were carried out. In this paper, the main emphasis is placed on the fatigue crack initiation mechanisms and their dependence of fatigue test parameters and grain orientations. Also, a brief overview of the mechanical behavior of MA 760 during high temperature cyclic straining will be presented.

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