Creep strength of a material shows a thin-section size effect, which means that the creep resistance of a testpiece varies with its dimensions. Therefore, it is important to understand the effect of section size on creep properties since these specimen characteristics have considerable technological significance for the design of aero engine blades with varying thicknesses. Combined effects of thin-section size and grain size (or number of grains across the gauge section) on the creep behaviour of the conventionally cast (CC) MAR-M 002 have been studied at the creep conditions of 900 deg C/ 300 MPa. It was observed that there is a good linear correlation between the ratio of time to fracture/ grain size and the ratio of creep rate/ thin-section size on log-log scales (the modified Monkman-Grant relation), where time to fracture is the creep rupture life and the creep rate is the minimum creep rate. The Monkman-Grant ductility (creep rate x time to fracture) improves rapidly with increasing the thin-section size.
Thin-section size effect on the Monkman-Grant ductility of a nickel-base superalloy
Wirkung der Größe dünner Schnitte auf die Duktilität nach Monkman-Grant in einer Superlegierung auf Nickel-Basis
1995
11 Seiten, 7 Bilder, 14 Quellen
Aufsatz (Konferenz)
Englisch
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