Influence of traces of Sb and Zr on creep and creep fracture of Ni-20% Cr
Conference
·
OSTI ID:6941435
The creep and creep fracture behavior of a Ni-20% Cr, a Ni-20% Cr-0.15% Sb and a Ni-20% Cr-0.11% Zr alloy are compared. Whereas Sb does not change the behavior of Ni-20% Cr, the addition of Zr leads to a pronounced reduction in the creep rate and a strong increase in the creep ductility. Analytical Electron Microscopy and Auger Analysis suggest that the segregation of S to the grain boundaries is reduced in the Zr-doped alloys. Diffusional creep data show that Zr slows down the grain boundary diffusivity in Ni-Cr. These experimental findings explain qualitatively why Ni-Cr-Zr fractures in a ductile manner and does not cavitate intergranularly.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6941435
- Report Number(s):
- CONF-820808-2; ON: DE82020914
- Country of Publication:
- United States
- Language:
- English
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