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Kinetic and metallographic study of oxidation at high temperature of cast Ni 25Cr alloy in water vapour rich air

机译:Ni 25Cr铸造合金在富水蒸气空气中高温氧化的动力学和金相研究。

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摘要

The high temperature oxidation behaviour of a Ni-25 wt-% Cr alloy in air enriched with water vapour (180 mbars H2O) was studied at 1000, 1100, 1200 and 1300 degrees C. The oxidised samples were characterised by X-ray diffraction, electron microscopy and wavelength dispersion spectroscopy. The obtained data were compared to the ones earlier obtained for the same alloy oxidised in dry air. Water vapour globally induced at all temperatures a decrease of the parabolic constant Kp and an increase in the chromia volatilisation constant Kv. The oxide scales do not present morphologic difference between the two atmospheres. After oxidation in humidified air the scale thickness is thinner and the Cr depleted depth is lower than in dry air.
机译:研究了Ni-25 wt%Cr合金在富含水蒸气(180 mbars H2O)的空气中在1000、1100、1200和1300℃下的高温氧化行为。通过X射线衍射对氧化后的样品进行表征,电子显微镜和波长色散光谱。将获得的数据与先前在干燥空气中氧化的相同合金的数据进行比较。在所有温度下,水蒸气总体上引起抛物线常数Kp的减小和氧化铬挥发常数Kv的增大。氧化皮在两种气氛之间没有形态差异。与潮湿空气相比,在潮湿空气中氧化后,氧化皮厚度更薄,Cr的消耗深度更低。

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