Notch effects on creep behaviour of CMSX-4 superalloy single crystals

0177750 - UFM-A 20013116 RIV US eng J - Journal Article
Lukáš, Petr - Preclík, Pavel - Čadek, Josef
Notch effects on creep behaviour of CMSX-4 superalloy single crystals.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 298, 1/2 (2001), s. 84-89. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA AV ČR IAA2041002
Institutional research plan: CEZ:AV0Z2041904
Keywords : superalloy single crystals * creep * notch effect
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 0.978, year: 2001

Smooth and notched specimens of CMSX-4 superalloy single crystals of orientations 001, 011 and 111 were creep tested at 850°C. For the same net-section stress the notched specimens exhibit a longer lifetime than the smooth specimens. Stress-strain analysis of notched specimens was performed by an elastic-plastic FEM procedure; the creep data of smooth specimens were used as input data. An excellent correlation was found between the lifetime of the notched specimens and the average value of the calculated steady-state creep strain rate. For all orientations the life curves of this type were found to be identical with the life curves for smooth specimens expressed in terms lifetime vs. steady state creep rate. Thus a modified Monkman-Grant relationship is valid both for smooth and notched specimens.
Permanent Link: http://hdl.handle.net/11104/0074662