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Effects of Si, Mn, and water vapour on the microstructure of protective scales grown on Fe-20Cr in CO2 gas

机译:Si,Mn和水蒸气对CO2气体生长的保护鳞片微观结构的影响

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摘要

Model alloys Fe-20Cr-0.5Si and Fe-20Cr-2Mn (wt-%) were exposed to Ar-20CO(2) and Ar-20CO(2)-20H(2)O at either 818 or 650 degrees C. In dry gas, protective scales on Fe-20Cr-0.5Si consisted of an outer Cr2O3 layer and an inner SiO2 layer. In wet gas, additional chromia whiskers were formed on top of the duplex scale. Chromia grains formed in wet gas were much smaller than those in dry gas. A TEM analysis revealed that phase constitutions of the protective scale on Fe-20Cr-2Mn were not uniform: Mn(3)O(4 )and MnCr(2)O(4 )above alloy grain boundaries and Mn3O4, Cr2O3 and MnCr(2)O(4 )on alloy grains. Formation of different oxides and morphologies are discussed in terms of changes in diffusion paths and thermodynamics caused by the presence of carbon and hydrogen.
机译:在818或650℃下,将Model合金Fe-20CR-0.5SI和Fe-20cC-2mN(WT-%)暴露于Ar-20co(2)和Ar-20co(2)-20h(2)℃。 干燥气体,Fe-20cr-0.5si上的保护尺度由外部Cr2O3层和内部SiO 2层组成。 在湿气中,在双相尺度的顶部形成额外的铬晶须。 在湿气体中形成的染色颗粒比干气体中的染粒片小得多。 TEM分析显示Fe-20cr-2Mn的保护尺的相位构成不均匀:Mn(3)O(4)和MNCR(2)O(4)以上合金晶界和Mn3O4,Cr2O3和MnCr(2 )O(4)在合金谷物上。 在由碳和氢引起的扩散路径和热力学的变化方面讨论了不同氧化物和形态的形成。

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