This thesis studied the effect of elevated temperature (600 C) on
the fretting fatigue behavior of IN-100. First, fretting and plain
fatigue S-N curves were determined over a large range of applied
stress at an identical stress ratio of 0.03 at 600 C and for
fretting tests, with a constant contact load. The partial slip
condition was verified by using hysteresis between shear force and
axial stress techniques. The contact width and the crack initiation
location were observed for all of the fretting specimens. The
contact widths were consistent with expected values and the crack
initiation location was at the trailing edge of contact for all
fretting specimens. This study compared its high temperature
results to room temperature testing accomplished by this study as
well as room temperature data from a previous study using IN-100
with an identical microstructure and another room temperature study
of IN-100 with a coarser microstructure. It was found that fretting
fatigue reduces the cycles to failure compared to plain fatigue at
elevated temperature but a more pronounced reduction was noticed
than with room temperature. It was also found that the elevated
temperature environment increased the both the plain and fretting
fatigue life as compared to similar stress levels at room
temperature. The study found that elevated temperature does have an
effect on crack initiation and crack propagation as compared to
room temperature environment. The higher temperature allowed a
longer initiation and crack propagation time which strongly
suggests the fatigue life increases with temperature up to 600 C.
The creation of oxide films and temperature induced softening or
plasticity were both found to act as crack closure mechanisms in
another nickel based superalloy, IN-718, when fatigued in the high
temperature environment. It is therefore likely that these
oxidation and plasticity crack closure mechanisms are the reasons
for the improved performance at elevated tempera These find
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