2426 Effect of inhomogeneous microstructures on high-temperature fatigue failure surface of transversally loaded directionally solidified superalloy
Year: 2007
Type: article
Abstract: Directionally solidifired suprealloy has elongated grains aligned to the directionally solidified axis. Its anisotropic shape of grain boundary network may affect the fractography or the fatigue crack propatation rate. In order to clarify such an effect, fatigue tests are conducted with longitudinally or transversally loaded specimens. Crack surface types are classified into 3types according to the relative configuration of DS axis, normal axis of crack surface, and crack propagation direction. The transgranular crack (L-type crack under the longitudinal load) shows low crack propagation rate da/dN, while the intergranular crack (TL-type, with crack direction parrallel to the DS axis, subjected to the transversal load) shows high da/dN. The transversally loaded crack with crack direction parpendicular to the DS axis (TT-type) shows the conbined crack surface of transgranular and intergranular ones, and its da/dN is fluctuated in the midst of those in L- and TL types.
Authors: Masato YAMAMOTO, Takayuki KITAMURA, Takashi OGATA
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2306915467