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02393 EFFECTS OF SILICON ON THE OXIDATION BEHAVIOR OF COMMERCIAL CHROMIA-FORMING ALLOYS

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Product Number: 51300-02393-SG
ISBN: 02393 2002 CP
Author: Bingtao Li and B. Gleeson
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The high-temperature oxidation behavior of chromia-forming alloys is significantly influenced by the presence of silicon additions, particularly under thermal cycling conditions. This paper compares and analyzes the cyclic oxidation resistance of the low-silicon alloy N08811 (0.15 wt% Si) and the high-silicon alloys N06045 (2.66 wt% Si), N12160 (2.75 wt% Si) and D-205 (5.3 wt% Si). Oxidation testing was conducted at 1000°C in still air and the specific aspects studied were scale spallation resistance, nature by which the silicon oxidized, and the influence of silicon on the subsurface depletion of chromium. The N08811 alloy performed the worst, undergoing rapid weight-loss kinetics after a period of relatively protective oxidation. The N06045 alloy exhibited the best oxidation resistance, which was believed to be due in part to the formation of a fine distribution of silica precipitates in the vicinity of the alloy/scale interface. Keywords: chromia-former, cyclic oxidation, silicon effect, scale spallation, chromium depletion
The high-temperature oxidation behavior of chromia-forming alloys is significantly influenced by the presence of silicon additions, particularly under thermal cycling conditions. This paper compares and analyzes the cyclic oxidation resistance of the low-silicon alloy N08811 (0.15 wt% Si) and the high-silicon alloys N06045 (2.66 wt% Si), N12160 (2.75 wt% Si) and D-205 (5.3 wt% Si). Oxidation testing was conducted at 1000°C in still air and the specific aspects studied were scale spallation resistance, nature by which the silicon oxidized, and the influence of silicon on the subsurface depletion of chromium. The N08811 alloy performed the worst, undergoing rapid weight-loss kinetics after a period of relatively protective oxidation. The N06045 alloy exhibited the best oxidation resistance, which was believed to be due in part to the formation of a fine distribution of silica precipitates in the vicinity of the alloy/scale interface. Keywords: chromia-former, cyclic oxidation, silicon effect, scale spallation, chromium depletion
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