Two further failed thermal creep pressurized tubes of V-4Cr-4Ti tested at 700 and 800 degrees C have been examined using optical microscopy and transmission electron microscopy in order to understand failure and creep mechanisms. These conditions represent lower stress states than were previously examined. Creep deformation at lower stress is shown to be controlled by sub-boundary formation and mis-orientation between sub-grains arising from climb of dislocations within the boundary.
Revised: April 9, 2007 |
Published: September 1, 2002
Citation
Gelles D.S. 2002.MICROSTRUCTURAL EXAMINATION OF V-4CR-4TI PRESSURIZED THERMAL CREEP TUBES. In Fusion Materials: Semi-Annual Progress Report Ending December 31, 2001. 17-23. Washington Dc:DOE Office of Fusion Energy Sciences.PNNL-SA-31907.