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Impacts of temperature and surface finish upon steam oxidation of austenitic steel TP347HFG

机译：温度和表面光洁度对奥氏体钢TP347HFG蒸汽氧化的影响

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摘要

The effects of the steam oxidation process on an austenitic steel (TP347HFG) exposed under isothermal conditions between 600 and 800 degrees C for up to 2500 h have been investigated. Samples with both as-received and ground surfaces have been exposed and the impact of surface finish on the oxidation process analysed using scanning electron microscopy with energy dispersive X-ray analysis. Exfoliated oxide flakes have also been examined to characterise their microstructures on fractured sections as well as external and spalled surfaces. Microscopic analyses demonstrated that ground surfaces possess better steam oxidation resistance than as-received surfaces due to their ability to form a more protective chromium-rich layer. The formation of regions of thicker multi-layered oxides was noted on both types of surface finish, covering large areas on as-received surfaces and only nodules on ground surfaces (spreading with increasing exposure temperature and time).
机译：研究了蒸汽氧化过程对在600-800℃的等温条件下暴露的奥氏体钢（TP347HFG）的影响已经得到高达2500小时。 具有接收和地面的样品已经暴露，并且表面光洁度对使用具有能量分散X射线分析的扫描电子显微镜分析的氧化过程的影响。 还检查了脱落的氧化薄片，以表征其在裂缝部分上的微观结构以及外部和倒置的表面。 显微分析证明，由于它们形成更富有的富含铬的层，地面具有比接收的表面更好的蒸汽氧化阻力。 在两种类型的表面光洁度上注意到较厚的多层氧化物区域的形成，覆盖在接收表面上的大面积，并且仅在地面上的结节（随着曝光温度和时间的增加而铺展）。

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