Grain boundary diffusion of {sup 181}W in Fe-Cr ferritic alloys
- Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials
The grain boundary diffusivity s{delta}D{sub b} of {sup 181}W in binary Fe-Cr alloys with 8--12 wt.% Cr, in a ternary alloy Fe-8Cr-0.17C and in two commercial modifications of 8% Cr ferritic steels were measured by the serial sectioning method in the temperature range 773--1,123 K. A variation of the Cr concentration in the range 8--12 wt.% does not influence s{delta}D{sub b}. The addition of carbon and, probably also phosphorus, decreases s{delta}D{sub b} similarly as it was observed in a previous study on iron diffusion in austenitic alloys Fe-Ni-Cr-C and Fe-Ni-Cr-P. The binary alloys could be considered pure, i.e. free of carbon, above 883 K, whereas at lower temperatures, probably due to residual carbon segregation to grain boundaries, a considerable decrease in s{delta}D{sub b} was observed compared with the extrapolated values from the high temperature region. The tungsten grain boundary diffusivity was found to be insensitive to small changes in the concentration of other alloying or impurity elements.
- OSTI ID:
- 99267
- Journal Information:
- Scripta Metallurgica et Materialia, Vol. 33, Issue 2; Other Information: PBD: 15 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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