Abstract
A novel plasma assisted tempering process has been developed to generate a stable α-Al2O3+FeAl coating on P91 steels. Hot dip aluminized P91 samples had been subjected to normalizing treatment in muffle furnace at 980°C for 20min followed by a glow discharge oxygen plasma assisted tempering treatment at 750°C for 1h. The plasma processing led to the formation of a stable α-Al2O3 coating, while thermal tempering in muffle furnace led to formation of θ-Al2O3 coating. Both the thermal and plasma tempered samples with alumina coating along with bare P91 samples were subjected to compatibility tests with Pb–17Li under static conditions at 550°C for 1000h. The extent of degradation of the samples was measured by weight loss method, X-ray diffraction and a cross-sectional examination with elemental studies using energy dispersive X-ray analysis. Plasma processed samples did not reveal any weight loss while thermally treated samples with metastable θ-Al2O3 indicated 0.23mg/cm2 weight loss and bare P91 steels indicated a weight loss of 7.3mg/cm2.
Published Version
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