Abstract
A study has been conducted to determine the high-temperature creep properties of high-purity, polycrystalline chromium. Iodide chromium was consolidated into 100 g buttons by arc melting and fabricated to sheet by rolling. Test specimens machined from the wrought sheet were annealed in palladium-purified hydrogen in order to produce stable grain structures for testing. Chemical analysis indicated a total interstitial impurity content of < 100 ppm. Step load creep tests were conducted over the temperature range 0.51–0.78 T m . Results showed that creep rates can be represented by the general creep equation g3 D = k σ n E where n, for chromium, is equal to 4.3. This correlation, which uses the previously determined activation energy of 73.2 kcal/mol for self diffusion in chromium, and observations of surface slip lines and dislocation substructures strongly suggest that a diffusion controlled, dislocation climb mechanism is operative in the creep of chromium over the temperature range investigated.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
