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Determination of yield in inconel 718 for axial-torsional loading at temperatures up to 649 c
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lissenden, Cliff J. Lerch, Bradley A. Gil, Christopher M. |
| Copyright Year | 1998 |
| Description | An experimental program has been implemented to determine small offset yield loci under axial-torsional loading at elevated temperatures. The nickel-base superalloy Inconel 718 (IN718) was chosen for study due to its common use in aeropropulsion applications. Initial and subsequent yield loci were determined for solutioned IN718 at 23, 371, and 454 C and for aged (precipitation hardened) IN718 at 23 and 649 C. The shape of the initial yield loci for solutioned and aged IN718 agreed well with the von Mises prediction. However, in general, the centers of initial yield loci were eccentric to the origin due to a strength-differential (S-D) effect that increased with temperature. Subsequent yield loci exhibited anisotropic hardening in the form of translation and distortion of the locus. This work shows that it is possible to determine yield surfaces for metallic materials at temperatures up to at least 649 C using multiple probes of a single specimen. The experimental data is first-of-its-kind for a superalloy at these very high temperatures and will facilitate a better understanding of multiaxial material response, eventually leading to improved design tools for engine designers. |
| File Size | 1806356 |
| Page Count | 38 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990008650 |
| Archival Resource Key | ark:/13960/t0bw2dn60 |
| Language | English |
| Publisher Date | 1998-11-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Temperature Effects Heat Resistant Alloys Distortion Axial Loads Strain Distribution Strain Measurement Yield Strength Plastic Properties Aircraft Engines High Temperature Environments Torsion Inconel Trademark Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
