Author(s)

T. Sadasue, M. Okazaki, Y. Mutoh, Yltoh & M. Saitolf

Abstract

The fatigue fracture of the Ni-base superalloy, IN 738LC, coated with the so-called M-Cr-Al-Y alloys by low pressure plasma spraying was studied at high temperature in vacuum condition. Most of the protective coatings exhibited the fatigue strength comparable to the IN 738LC substrate, when the fatigue fracture was controlled by the propagation of the fatigue crack which initiated from the casting defects in the superalloy substrate. However, when the fatigue crack initiation occurred from the coated layer, the fatigue strength of the coatings was significantly reduced depending on the M-Cr-Al-Y alloy systems, compared with that of t

Keywords