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首页> 外文期刊>Materials at High Temperatures >Investigation of FIB-thinned TEM cross-sections of oxide scales formed on type 310 steel at 600 deg C in water vapour-containing oxygen atmospheres
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Investigation of FIB-thinned TEM cross-sections of oxide scales formed on type 310 steel at 600 deg C in water vapour-containing oxygen atmospheres

机译:在含水蒸气的氧气气氛中于600摄氏度下研究310型钢在FIB上稀释的氧化皮的TEM截面

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摘要

The effect of water vapour on the oxidation of the type 310 (25Crl9Ni) austenitic stainless steel was studied through the detailed microstructure characterisation of the oxide scales formed at 600 deg C in dry O_2, O_2 containing 40 percent H_2O at 0.5 cm/s, and O_2 containing 40 percent H_2O at 5 cm/s. FIB equipment was utilised for imaging and for producing thin foils containing the cross-section of oxide features for detailed analysis using TEM/EDS. Thin protective Cr-rich (Cr,Fe)_2O_3 was maintained in dry O_2 atmosphere. Cr-loss through CrO_2(OH)_2 evaporation in H_2O-containing O_2 atmosphere from the oxide scale could, at sufficiently high flow rate, trigger local breakaway oxidation after 168 hours of exposure. These breakaway sites featured large oxide nodules, each consisting of an outward growing oxide island and an inward growing oxide crater. The local post-breakaway oxidation behaviour was discussed based on the composition and distribution of the various phases in these oxide nodules.
机译:通过详细的微观结构表征,研究了水蒸气对310型(25Crl9Ni)奥氏体不锈钢氧化的影响,该特性在干燥的O_2、0.5 cm / s的H_2O含量为40%的O_2, O_2的5 cm / s含40%H_2O。 FIB设备用于成像和生产包含氧化物特征横截面的薄箔,以便使用TEM / EDS进行详细分析。在干燥的O_2气氛中保持稀薄的富铬保护性(Cr,Fe)_2O_3。在含H_2O的O_2气氛中,从氧化皮中通过CrO_2(OH)_2蒸发产生的Cr损失,在足够高的流速下,暴露168小时后可能触发局部脱离氧化。这些分离点的特征是大的氧化物结核,每个结核都由向外生长的氧化物岛和向内生长的氧化物火山口组成。基于这些氧化物结核中各相的组成和分布,讨论了局部脱离后的氧化行为。

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