Scale Formation of Alloy 602 CA During Isothermal Oxidation at 800–1100 °C in Different Types of Water Vapor Containing Atmospheres

Scale Formation of Alloy 602 CA During Isothermal Oxidation at 800–1100 °C in Different Types of Water Vapor Containing Atmospheres
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602 CA合金在800~1100°C不同类型的水蒸气气氛中等温氧化过程中的氧化皮形成

DOI:
10.1007/s11085-015-9595-7
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发表时间:
2015
影响因子:
2.2
通讯作者:
WJ Quadakkers
WJ Quadakkers
中科院分区:
材料科学3区
文献类型:
--
作者:
M Schiek;L Niewolak;W Nowak;GH Meier;R Vaßen;WJ Quadakkers

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在800 ~ 1100 °C的温度范围内,研究了602 CA镍基合金在与化石发电厂气体分离装置相关的大气中的氧化行为。在Ar-7%H2O、Ar-4%H2 - 7%H2O、Ar-20%O2 - 7%H2O中测定等温氧化动力学,为了比较,在Ar-20%O2中测定等温氧化动力学。合金在800 °C下氧化期间形成外部氧化铝氧化皮,与气氛无关。升高温度会导致氧化铝氧化皮逐渐被外部氧化铬层和内部氧化铝沉淀物取代。氧化铬的生长速率受气体成分的影响,这是由于氧化皮中的钛结合和向外突出的金属结核。在试样磨削过程中,表面冷加工强烈影响外部氧化铝氧化皮的形成。这种促进外部氧化铝氧化皮形成的效应在800 °C下暴露期间得以保留,但在较高温度下迅速丧失,导致外部氧化铬氧化皮形成和铝的内部氧化。
The oxidation behavior of the nickel base Alloy 602 CA in atmospheres, relevant to gas separation units in fossil fired power plants, was investigated in the temperature range 800 to 1100 °C. Isothermal oxidation kinetics were determined in Ar–7 %H2O, Ar–4 %H2–7 %H2O, Ar–20 %O2–7 %H2O and, for comparative purposes, in Ar–20 %O2. The alloy formed an external alumina scale during oxidation at 800 °C, regardless of the atmosphere. Increasing the temperature results in gradual replacement of the alumina scale by an external chromia layer and internal alumina precipitates. The chromia growth rate is affected by the gas composition, due to titanium incorporation in the scale and outwardly protruding metallic nodules. The external alumina scale formation was strongly affected by surface cold work during specimen grinding. This effect, which promoted external alumina scale formation, was retained during exposure at 800 °C but was rapidly lost at higher temperatures resulting in external chromia scale formation and internal oxidation of aluminum.
使用 MC-SIMS 和电子束 SNMS 对 ODS 合金上的氧化膜进行定量分析
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