Internal sulfide precipitation in low Cr-Fe alloys
- Lehigh Univ., Bethlehem, PA (United States). Dept. of Materials Science and Engineering
The present article examines the internal sulfide precipitation in low Cr-Fe alloys that resulted from solid-state diffusion experiments at 600 C. The internal sulfide precipitate microstructure is shown in alloys ranging from 11.3 wt pct Cr to 51.1 wt pct Cr. The diffusion composition profile and sulfide phase compositions have been measured using electron probe microanalysis (EPMA). Based on the microprobe data and some calculations using established internal sulfidation theory, a description of the internal sulfide precipitation sequence and depth is explained and the sulfide precipitate morphology is quantified. The solid-state diffusion experiments indicate that the optimum Cr composition range for sulfidation resistance at 600 C is between 20 and 40 wt pct Cr. The results have also been compared with existing low-temperature gas-solid sulfidation literature and the differences in results are explained.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 417876
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 27, Issue 10; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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