Metal dusting corrosion of austenitic alloys at low and high pressure with the effects of Cr, Al, Nb and Cu
Résumé
Commercial and model alloys were exposed at 570 degrees C to metal dusting conditions at 1 and 21 bar in CO-H-2-H2O and CO-H-2-CO2-CH4-H2O atmospheres, respectively, with similar a(c) and P-O2 center dot gamma `' precipitation beneath the surface of 625 superalloy was due to Nb diffusion toward the Cr-depleted zone formed during oxidation. 693 superalloy was more carburised than 690 superalloy. alpha-Al2O3 formation was believed to induce cracks through the oxide scale, resulting in the alloy carburisation. Cu addition to a FeNiCr model alloy lead to the formation of an almost continuous Cu layer at the oxide/metal interface, greatly improving the metal dusting resistance.
Domaines
Sciences de l'ingénieur [physics]
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Metal-dusting-corrosion-of-austenitic-alloys-at-low-and-high-pressure.pdf (2.02 Mo)
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