Microstructure of a nickel-base superalloy after creep in [011] orientation at 1173 K
✍ Scribed by Thomas Kuttner; Monika Feller-Kniepmeier
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 718 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0921-5093
No coin nor oath required. For personal study only.
✦ Synopsis
Tensile creep tests in the [011] direction have been performed on two specimens of SRR99 at 1173 K under a load of 300 MPa. The microstructure was analysed by transmission electron microscopy investigations after plastic strains of 0.1% and 0.29%. At both strains, the 7' phase is not sheared by dislocations. Plastic deformation is concentrated in roof matrix channels lying at an angle of 45 ° to the load axis. Gable matrix channels that contain the load axis are almost free of dislocations. This experimental result was shown to be due to the supe:rposition of coherency and external load stress tensors, leading to different levels of shear stress in the two types of matrix channel. The results obtained at 1173 K are compared with previous results at 1033 K.