Fatigue crack growth behavior of a single crystal alloy as observed through an in situ fatigue loading stageAn in situ fatigue loading stage inside a scanning electron microscope (SEM) was used to determine the fatigue crack growth behavior of a PWA 1480 single-crystal nickel-based superalloy. The loading stage permits real-time viewing of the fatigue damage processes at high magnification. The PWA 1480 single-crystal, single-edge notch specimens were tested with the load axis parallel to the (100) orientation. Two distinct fatigue failure mechanisms were identified. The crack growth rate differed substantially when the failure occurred on a single slip system in comparison to multislip system failure. Two processes by which crack branching is produced were identified and are discussed. Also discussed are the observed crack closure mechanisms.
Document ID
19890058575
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Telesman, Jack (NASA Lewis Research Center Cleveland, OH, United States)
Kantzos, Peter (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Metallic Materials
Meeting Information
Meeting: International SAMPE Metals and Metals Processing Conference