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首页> 外文期刊>Oxidation of Metals >Effect of Atmosphere and Sample Thickness on Kinetics, Microstructure, and Compressive Stresses of Chromia Scale Grown on Ni-25Cr
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Effect of Atmosphere and Sample Thickness on Kinetics, Microstructure, and Compressive Stresses of Chromia Scale Grown on Ni-25Cr

机译：大气和样品厚度对NI-25CR生长的动力学，微观结构和抗压应力的影响

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摘要

Most high-temperature alloys rely on the formation of a protective chromia scale during service. Generally, the oxidation resistance is mainly influenced or limited by corrosive environments around the alloy. In the present study, the evaluation of kinetic data is connected to microstructural analyses and stress measurements of the Cr2O3-layer formed on the Ni-25Cr model alloy after 1000 A degrees C of isothermal exposure to atmospheres with and without water vapor and a varying (1 and 0.01%) oxygen content. Significant differences in oxide morphology, scale thickness, and oxide grain appearance could be observed. The results, with respect to oxidation kinetics and microstructures, showed a high tendency of variation when water vapor is present in the test gas. It was found that the addition of water vapor to the dry gas leads to decreased oxidation rates and reduced chromia scale thicknesses. The influence of the gas composition on the defect structure, the chromium flux, and diffusion of gas species is discussed on the basis of classical oxidation theory.
机译：大多数高温合金依赖于在服务期间形成保护染色尺度。通常，氧化抗性主要受合金周围腐蚀性环境的影响或限制。在本研究中，动力学数据的评估与在Ni-25Cr Model合金中形成的CR2O3层的微观结构分析和应力测量在1000℃的等温暴露于大气中，在有水蒸气和不同水蒸气和变化（ 1和0.01％）氧含量。可以观察到氧化物形态，鳞片厚度和氧化物晶粒外观的显着差异。关于氧化动力学和微观结构的结果表明，当水蒸气存在于试气中时，在试验气体中存在时，变化的高趋势。发现将水蒸气加入干燥气体导致氧化率降低和减少的染色尺度厚度。基于经典氧化理论，讨论了气体组合物对缺陷结构，铬通量和气体物种扩散的影响。

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