Microstructural Changes in MA 760 During High Temperature Low Cycle Fatigue

A. Hynna, V.-T. Kuokkala
2000 Superalloys 2000 (Ninth International Symposium)   unpublished
The HTLCF properties and related microstructures of MA 760, a mechanically alloyed oxide dispersion strengthened Ni-base superalloy, were studied using specimens of two different grain orientations. The push-pull fatigue tests with total strain as a control parameter were conducted at two different strain rates, g =0.005 i' and & =0.0005 s", at the temperatures of 650 @C, 950 "C, 1000 "c and 1050 'C. The fracture surfaces and the dislocation microstructures of the fatigued specimens were
more » ... ecimens were studied using optical microscopy, scanning electron microscopy (SEM) and analytical electron microscopy (AEM). In this paper, the changes in the microstructure of MA760 during strain cycling at high temperatures are reported and discussed.
doi:10.7449/2000/superalloys_2000_563_571 fatcat:ypjw63feqrgnply3hocheblzzq