March 1, 2006
Book Chapter

FURTHER OBSERVATIONS ON V-4Cr-4Ti PRESSURIZED CREEP TUBES

Abstract

Further observations are provided for pressurized thermal creep tubes of V-4Cr-4Ti examined following testing in the range 650 to 800°C for tests lasting up to ~104 h. Precipitate particles have been analyzed by EELS to define interstitial contents, and are shown to be either C or O rich with only minor N contents. Grain shape aspect ratios as a function of strain have been measured and these data shows shape change as a result of effective mid-wall strains as high as 12.7%. Deformation mechanisms are considered to explain Newtonian viscous flow response at 800°C below effective midwall stresses of 70 MPa, and it is concluded that grain boundary sliding probably is the predominant mechanism based on the microstructural information presented here, but there is evidence that Harper-Dorn creep may also be a contributing creep mechanism under these conditions.

Revised: October 22, 2009 | Published: March 1, 2006

Citation

Gelles D.S., R.J. Kurtz, M.B. Toloczko, and L.E. Thomas. 2006. FURTHER OBSERVATIONS ON V-4Cr-4Ti PRESSURIZED CREEP TUBES. In Fusion Materials Semiannual Report for the period ending December 31, 2005, DOE/ER-313/39. 2-10. Oak Ridge, Tennessee:Oak Ridge National Laboratory. PNNL-SA-48689.