44. A method for determining the microstructural changes in graphite that accompany high-temperature deformation
✍ Scribed by W.V Green; L.S Levinson; R.D Reiswig; E.G Zukas
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 130 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0008-6223
No coin nor oath required. For personal study only.
✦ Synopsis
Creep curves for eight different graphites showed that the creep strain obeyed the well known equation E= At". Since the mechanisms controlling creep rate through stress and temperature are dependent on structure, it seems inappropriate to analyse the coefficients of this equation in detail. Activation energies for two samples of Graph-i-tite "G" were determined by three different methods from the same creep data; i.e. after constant time, after constant strain, and by measurements on the same sample before and after a temperature change. Widely different activation energies were obtained. The unispecimen technique is recommended since the measurements are made at equal times, equal strain, and for equivalent internal structures.
l Work performed under the auspicea of the United Statea Atomic Energy Commission.