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Applied Stress Effects On The Isothermal And Cyclic High-Temperature Oxidation Behavior Of Superalloys, Bryan R. Barnard
Applied Stress Effects On The Isothermal And Cyclic High-Temperature Oxidation Behavior Of Superalloys, Bryan R. Barnard
Masters Theses
The effects of applied tensile stresses on the isothermal and cyclic oxidation behavior of two nickel-based superalloys, HAYNES® 75® and HAYNES® 230®, were investigated through measurements of specific mass change, oxide morphology and thickness, degree and depth of internal oxidation, compositional changes in and around the oxide scales, and x-ray diffraction. Here, an applied tensile stress generally led to larger Cr/Ni ratios in the oxide scales, greater chromium depletion in areas directly under the oxide scales, lower specific-mass-change values, and thinner oxide scales. These improvements in oxidation resistance are attributed to a greater concentration of …