Ternary and Quaternary Interdiffusion in ? (fcc) Fe-Ni-Cr-X (X = Si, Ge) Alloys at 900?C
- University of Central Florida
- ORNL
Interdiffusion in Fe-Ni-Cr (fcc phase) alloys with small additions of Si and Ge at 900 C was studied using solid-to-solid diffusion couples. Alloy rods of Fe-24 at.%Ni, Fe-24 at.%Ni- 22at.%Cr, Fe-24 at.%Ni-22at.%Cr-4at.%Si and Fe-24 at.%Ni-22at.%Cr-1.7at.%Ge were cast using arc-melt, and homogenized at 900 C for 168 hours. Sectioned alloy disks from the rods were polished, and diffusion couples were assembled with in Invar steel jig, encapsulated in Argon after several hydrogen flushes, and annealed atz 900 C for 168 hours. Polished cross-sections of the diffusion couples were characterized to determine experimental concentration profiles using electron probe microanalysis with pure elemental standards. Interdiffusion fluxes of individual components were calculated directly from the experimental concentration profiles, and the moments of interdiffusion flux profiles were examined to determine the average ternary and quaternary interdiffusion coefficients. Effects of alloying additions on the interdiffusional behavior of Fe-Ni- Cr-X alloys at 900 C are presented with due consideration for the formation of protective Cr2O3 scale.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- FE USDOE - Office of Fossil Energy (FE)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 934947
- Resource Relation:
- Conference: High-Temperature Corrosion and Protection of Materials, Les Embiez, France, 20080518, 20080523
- Country of Publication:
- United States
- Language:
- English
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