Sulfidation properties of an Fe-26. 4Cr-8Al-6Mn alloy at 973 and 1,073 K in H sub 2 S-H sub 2 atmospheres, 10 sup minus 4 le P sub S sub 2 le 10 sup 2 Pa

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF00666624· OSTI ID:7266952

Przybylski, K ^[1]; Smeltzer, W W ^[2]

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1. Academy of Mining and Metallurgy, Krakow (Poland)
2. McMaster Univ., Hamilton, Ontario (Canada)

The sulfidation behavior of an Fe-26.4Cr-8Al-6Mn (at.%) alloy in H{sub 2}S-H{sub 2} atmospheres, 10{sup {minus}4} {le} P{sub S{sub 2}} {le} 10{sup 2}Pa, was investigated at 973 and 1,073 K. The reaction kinetics exhibited an early transient stage before onset of parabolic kinetics. At all sulfur pressures, the outstanding feature was the presence of three distinct macroscopic layers in each sulfide scale, The outer layer of isolated plates and needles was porous, whereas the intermediate layer exhibited a compact morphology with equiaxed and columnar grains. The inner layer was composed of equiaxed grains contained porosity. It was found that the inner and intermediate layers contained a number of phases: spinel (Fe, Al, Mn)Cr{sub 2}S{sub 4}, hexagonal (Cr, Al, Fe, Mn)S{sub 3}, and hexagonal (Fe, Cr, Mn)Al{sub 2}S{sub 4}. The plates and needles in the outer porous layer consisted of (Fe, Mn)S with Mn enrichment in the basal region. Internal sulfidation of the alloy led to precipitation in both intragranular and intergranular modes of Al{sub 2}S{sub 3} doped with the other metallic elements. Marker measurements demonstrated that growth of the scale inner layer was supported by inward diffusion of sulfur and that growth of the intermediate and outer layers resulted from outward diffusion of all metallic elements.

• OSTI ID: 7266952
• Journal Information: Oxidation of Metals; (United States), Journal Name: Oxidation of Metals; (United States) Vol. 37:5-6; ISSN 0030-770X; ISSN OXMEA
• Country of Publication: United States
• Language: English

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ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM SULFIDES
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HYDROGEN SULFIDES
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SCANNING ELECTRON MICROSCOPY
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TEMPERATURE RANGE 1000-4000 K
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