Abstract
Small punch creep (SPC) tests were conducted in vacuum to evaluate creep property of Ni-base superalloys, Inconel738LC, Alloy706 and Alloy718. Test results were correlated with uniaxial creep tests in terms of the conversion of applied load to stress. Rupture lives of uniaxial and SPC tests were arranged against the applied stress and load using Larson-Miller parameter respectively. Then, the ratio of load (F,N) to stress (σ, MPa) was calculated so that both curves were overlapped each other. As a result, the correlation was estimated to be F=1.7σ (IN738LC), F=1.1σ (Alloy706), F=1.2σ (Alloy718). Fracture morphologies were intergranular fracture (Alloy706, Alloy718), intergranular+transgranular fracture (Inconel 738LC). The ratio of F to σ became smaller as the fracture morphology changed to brittle.
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