| Hauptseite > Publikationsdatenbank > Oxidation Behaviour and Microstructural Stability of Alloy 625 During Long-Term Exposure in Steam > print |
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| 100 | 1 | _ | |a Garcia-Fresnillo, L. |0 P:(DE-HGF)0 |b 0 |e Corresponding Author |
| 245 | _ | _ | |a Oxidation Behaviour and Microstructural Stability of Alloy 625 During Long-Term Exposure in Steam |
| 260 | _ | _ | |a Dordrecht [u.a.] |c 2014 |b Springer Science + Business Media B.V |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1418138713_13543 |2 PUB:(DE-HGF) |
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| 520 | _ | _ | |a Nickel-based alloys are being considered as construction materials for various components in high-efficiency steam turbines with envisaged operating temperatures around 700 °C. In the present study, the steam oxidation behaviour of the nickel-based alloy 625 in the temperature range of 700–800 °C was investigated whereby exposures up to 10000 h were carried out. Gravimetric data in combination with results from a variety of post exposure analysis techniques showed in all cases the formation of protective oxide scales mainly consisting of chromia with minor amounts of outer Cr/Mn spinel and internal silica. The phases found in the bulk alloy after long-term exposure were mainly needle-shaped δ-Ni3(Nb,Mo) phase, μ-phase and Si-rich η-M6C carbide. Microstructural features and phase formation were found to be related to minor variations in the alloy composition, especially iron and silicon content. The oxidation-induced chromium depletion caused a number of microstructural changes in the subsurface depletion layer. Most important was an enrichment of the intermetallic δ-phase at the scale–alloy interface. DICTRA modelling revealed this effect to be caused by uphill diffusion as a result of a negative niobium activity gradient in the subscale chromium depletion zone. Although the available kinetic and thermodynamic data allowed qualitative explanation of the δ-phase enrichment, the databases do not correctly describe the high molybdenum solubility in the δ-phase. |
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| 773 | _ | _ | |a 10.1007/s10853-014-8344-7 |0 PERI:(DE-600)2015305-3 |n 17 |p 6127-6142 |t Journal of materials science |v 49 |y 2014 |x 0022-2461 |
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