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Three commercial steels were exposed to carbon-saturated sodium at 873 K for durations up to 5000 h. Analyses by optical microscopy, infrared-inductive carbon combustion, electron probe microanalysis and glow discharge optical emission spectrometry revealed important carburization of the steels. The carbon concentration at the metal–sodium interface reached equilibrium, and the carbon uptake varied...
Model alloys Ni–(5, 10, 20, 25, 30 wt%)Cr were exposed to Ar–20CO2 and Ar–20O2 at 700 °C. Samples were electropolished before reaction to avoid cold-working effects and, as a result, to reveal the effect of alloy bulk diffusion. All alloys underwent breakaway oxidation in CO2, forming an external Ni-rich oxide scale and other oxides internally. In oxygen, the Ni–(5, 10, 20)Cr alloys formed a nonprotective...
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