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96423 ALLOYING ELEMENT DIFFUSION IN ALLOY 800 H (UNS N08810) AND ALLOY 617 (UNS N06617)

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Product Number: 51300-96423-SG
ISBN: 96423 1996 CP
Author: L. Maldonadc, L. Diaz, H. Griibmaier, A. Naoumidis, H. Nickel, H. Grubmeier
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Samples of alloy 800 H (UNS N08810) and alloy 617 (UNS N06617) were oxidized in a simulated process gas atmosphere. The principal elements of the gaseous environment were 50% H2O , 35% H2 and 5% of CO2, CO, and CH4, respectively. The experiments were carried out at temperatures from 850°C to 950°C for exposures ranging from 600 to 5000 hours. After the exposure, the alloy surfaces showed compact oxide layers, which resulted in a depleted zone of oxidizing element; in the substrate layer. Using Electron Probe Microanalysis (EPMA), concentration profiles and thy extension of the depleted zone were measured. Calculated theoretical profiles were then fitted to that EPMA-measured profiles, using Fick’s second law of diffusion and resolved by a finite different method... Keywords: Alloy 800 H, alloy 617, concentration profiles, chromium, diffusion
Samples of alloy 800 H (UNS N08810) and alloy 617 (UNS N06617) were oxidized in a simulated process gas atmosphere. The principal elements of the gaseous environment were 50% H2O , 35% H2 and 5% of CO2, CO, and CH4, respectively. The experiments were carried out at temperatures from 850°C to 950°C for exposures ranging from 600 to 5000 hours. After the exposure, the alloy surfaces showed compact oxide layers, which resulted in a depleted zone of oxidizing element; in the substrate layer. Using Electron Probe Microanalysis (EPMA), concentration profiles and thy extension of the depleted zone were measured. Calculated theoretical profiles were then fitted to that EPMA-measured profiles, using Fick’s second law of diffusion and resolved by a finite different method... Keywords: Alloy 800 H, alloy 617, concentration profiles, chromium, diffusion
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