OS6-11 スモールパンチクリープ試験法のNi超合金への適用性の検討(OS6 設備診断・運用保全技術,循環型社会における動力エネルギー技術)

概要

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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.
社団法人日本機械学会の論文
2007-06-13