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| 001 | 279591 | ||
| 005 | 20240711092302.0 | ||
| 024 | 7 | _ | |a 10.1016/j.jallcom.2015.03.076 |2 doi |
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| 100 | 1 | _ | |a Niewolak, Leszek |0 P:(DE-Juel1)129770 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Sigma-Phase Formation in High Chromium Ferritic Steels at 650°C |
| 260 | _ | _ | |a Lausanne |c 2015 |b Elsevier |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1449824854_10438 |2 PUB:(DE-HGF) |
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| 520 | _ | _ | |a A binary Fe–30 wt.%Cr alloy and corresponding ternary alloys containing manganese, molybdenum or tungsten were studied with respect to σ-phase formation at 650 °C. Although even after 3000 h exposure complete equilibration was not attained, the presence of tungsten and especially molybdenum was found to promote σ-phase formation. More extensive σ-phase formation was observed in the tungsten and especially in the molybdenum-containing alloys than in the binary and manganese-containing alloy. Apparently the bulk free energy decrease driving the nucleation of σ-phase is substantially larger when tungsten or molybdenum are present in the alloy.The presence of a nickel layer, to simulate the contact between ferritic steel interconnects and nickel mesh in a Solid Oxide Fuel Cell (SOFC) results in the formation of an austenitic zone and in accelerated formation of a σ-phase rich layer at the ferrite/austenite interface, due to interdiffusion processes. This interface acts as a highly efficient heterogeneity for the nucleation of σ-phase. The nucleation is enhanced by an increased Cr/Fe-ratio at that interface. Several possible modes for the growth of the σ layer were identified but the available experimental data were not sufficient to distinguish among these. The σ-rich layer, which appears to act as an interdiffusion barrier, is thicker in the case of the binary Fe–Cr and the Fe–Cr–Mn alloy than for the molybdenum- or tungsten-rich alloys.The results show that the stability range of σ-phase is larger than indicated by the presently used thermodynamic data bases. |
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| 700 | 1 | _ | |a Garcia-Fresnillo, L. |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Meier, G. H. |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a Quadakkers, Willem J. |0 P:(DE-Juel1)129782 |b 3 |
| 773 | _ | _ | |a 10.1016/j.jallcom.2015.03.076 |0 PERI:(DE-600)2012675-X |p 405-418 |t Journal of alloys and compounds |v 638 |y 2015 |x 0925-8388 |
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