Effect of Specimen Thickness on the Creep Response of a Single Crystal Superalloy (Preprint)
UNIVERSITY OF NORTH TEXAS DENTON
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Creep tests on single crystal superalloy sheet specimens have shown a thickness dependent creep behavior. This is termed the thickness debit effect. To investigate the mechanism of thickness debit effect, isothermal, constant nominal stress creep tests at two test conditions 760 deg C758MPa and 982 deg C248MPa were performed on the uncoated sheet specimens of thicknesses 3.18mm and 0.51mm of PWA1484 Ni-base single crystal superalloy. It was observed that the dependence on specimen thickness under the two test conditions are different. At 760 deg C758MPa reduction in creep strain to rupture with decreasing section.