A combination of extrapolation and estimation techniques from both prior and current studies has been explored with the goal of developing a method to accurately characterize high-stress amplitude low cycle fatigue of a material commonly used in gas turbine blades with the absence of such data. This paper describes innovative methods used to predict high-temperature fatigue of IN738LC, a dual-phase Ni-base superalloy. Three sets of experimental data at different temperatures are used to evaluate and examine the validity of extrapolation methods such as anchor points and hysteresis energy trends. High-stress amplitude data points approaching the ultimate strength of the material were added to pre-existing base data with limited plastic strain to achieve a full-range data set that could be used to test the legitimacy of the different prediction methods. Each method is evaluated at a number of temperatures.
Issue Section:
Research Papers
Keywords:
aluminium alloys,
boron alloys,
carbon,
chromium alloys,
extrapolation,
fatigue,
gas turbines,
molybdenum alloys,
nickel alloys,
niobium alloys,
plastic deformation,
superalloys,
tantalum alloys,
tensile strength,
titanium alloys,
tungsten alloys,
zirconium alloys,
very low cycle fatigue,
IN738,
high-temperature materials,
Ni-base superalloy
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.Copyright © 2011
by American Society of Mechanical Engineers
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