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Possible connection between nodule development and presence of niobium and/or titanium during short time thermal oxidation of AISI 441 stainless steel in wet atmosphere

机译:AISI 441不锈钢在潮湿环境中短时间热氧化过程中,结节的发展与铌和/或钛的存在之间可能存在联系

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摘要

AISI 441 ferritic stainless steel is a good candidate for metallic interconnects of solid oxide fuel cells (SOFCs). In this alloy, the minor elements Ti and Nb are used to stabilise the ferritic structure but their influence on steel durability is not well understood. This study focuses on the early stages of oxidation (24 h) at 800 degrees C of AISI 441 under 5% H2O in O-2 following the cathodic SOFCs conditions. The typical duplex oxide scale, composed of a (Mn, Cr)(3)O-4 spinel top layer and a Cr2O3 rich sublayer is observed, with oxide nodules growing in places. These objects, in the micrometre range in size, are studied by FIB tomography. The analyses reveal a complex structure and a development strongly linked to the presence of niobium and/ or titanium compound(s) in the subjacent substrate.
机译:AISI 441铁素体不锈钢非常适合用于固体氧化物燃料电池(SOFC)的金属互连。在这种合金中,微量元素Ti和Nb用于稳定铁素体组织,但它们对钢的耐用性的影响尚不清楚。这项研究的重点是在阴极SOFCs条件下,在O-2中5%的H2O下,在800摄氏度的AISI 441下,氧化的早期阶段(24小时)。观察到由(Mn,Cr)(3)O-4尖晶石顶层和富含Cr2O3的子层组成的典型双相氧化物氧化皮,并在某些地方生长了结核。这些物体的大小在微米范围内,通过FIB层析成像技术进行了研究。分析表明,复杂的结构和发展与底层衬底中铌和/或钛化合物的存在密切相关。

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