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Influence of dissolved oxygen concentration and exposure temperature on the steam oxidation behaviour of HR3C

机译:溶解氧浓度和曝光温度对HR3C蒸汽氧化行为的影响

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摘要

Oxidation behaviour of an austenitic steel HR3C at 620 similar to 650 degrees C for 1000 h in steam with two different levels of dissolved oxygen (DO), 20 ppb and 5 ppm, was investigated by gravimetry, X-ray diffraction and scanning electron microscopy. Results showed that mainly a single-layered (Cr, Mn)(2)O-3 scale was developed. The oxide growth followed near-power kinetics and was accelerated with DO concentration and exposure temperature. At the higher DO concentration, the formation of (Cr, Mn)(2)O-3 with a much smaller size was favoured. Besides, the oxide scale became undulated and interfacial voids formed. Higher exposure temperature resulted in the growth of the (Cr, Mn)(2)O-3 crystals and the change of their morphology from acicular to granular. Fe3O4 nodules and Ni-Cr spinel occurred at 650 degrees C/5 ppm DO. Related oxidation mechanisms were discussed.
机译:通过重量法,X射线衍射和扫描电子显微镜研究,620在蒸汽中,在蒸汽中氧化行为在620℃下与650℃相似的650℃。 结果表明,主要开发了单层(Cr,Mn)(2)O-3规模。 氧化物生长伴随着近代动力学,并加速了浓度和暴露温度。 在较高的浓度下,有利于尺寸小得多的(Cr,Mn)(2)O-3的形成。 此外,氧化物尺度变得波动和形成的界面空隙。 较高的曝光温度导致(Cr,Mn)(2)O-3晶体的生长以及它们与粒状的形态的变化。 Fe3O4结节和Ni-Cr尖晶石发生在650摄氏度C / 5 ppm。 讨论了相关的氧化机制。

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  • 作者单位

    Xian Thermal Power Res Inst Co Ltd Natl Engn Res Ctr Clean Coal Combust Util Boilers Xian 710032 Shaanxi Peoples R China;

    Xian Thermal Power Res Inst Co Ltd Natl Engn Res Ctr Clean Coal Combust Util Boilers Xian 710032 Shaanxi Peoples R China;

    Xian Thermal Power Res Inst Co Ltd Natl Engn Res Ctr Clean Coal Combust Util Boilers Xian 710032 Shaanxi Peoples R China;

    Xian Thermal Power Res Inst Co Ltd Natl Engn Res Ctr Clean Coal Combust Util Boilers Xian 710032 Shaanxi Peoples R China;

    Xian Thermal Power Res Inst Co Ltd Natl Engn Res Ctr Clean Coal Combust Util Boilers Xian 710032 Shaanxi Peoples R China;

    Xian Thermal Power Res Inst Co Ltd Natl Engn Res Ctr Clean Coal Combust Util Boilers Xian 710032 Shaanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 金属腐蚀与保护、金属表面处理;
  • 关键词

    Austenitic steels; oxidation; dissolved oxygen; scanning electron microscopy;

    机译:奥氏体钢;氧化;溶解氧;扫描电子显微镜;

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