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Studies on the Oxidation Behavior and Microstructural Evolution of Two Nb-Modified HR3C Austenitic Steels under Pure Water Vapor at 650 °C

机译:650℃纯水蒸汽下两种NB改性HR3C奥氏体钢的氧化行为和微观结构演化

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摘要

The steam oxidation behavior of three heterogeneous HR3C alloys was investigated at 650 °C comparatively. After a long-term oxidation process for 1000 h, the results demonstrated that the commercial HR3C alloy already exhibited a high oxidation resistance. However, the spallation resistance of the oxide scale was low during the initial oxidation period. The addition of a moderate amount of Nb into the alloy (1#HR3C) increased the oxidation resistance of the alloy. In addition, the improvement of the microstructural stability was substantially influenced by solid solution strengthening and fine grain strengthening. However, the addition of excessive Nb could significantly affect the growth model of the oxide scale and negatively affect the oxidation performance and microstructural evolution of the alloy (2#HR3C).
机译:在650℃的650℃下研究了三种非均相HR3C合金的蒸汽氧化行为。在长期氧化过程1000小时后,结果表明商业HR3C合金已经表现出高抗氧化性。然而,在初始氧化期间,氧化物尺度的剥落性低。将中等量的Nb加入合金(1#HR3C)增加了合金的抗氧化性。此外,微观结构稳定性的改善基本上受固溶体强化和细粒强化的影响。然而,添加过多的Nb可以显着影响氧化物尺度的生长模型,并对合金(2#HR3C)的氧化性能和微观结构演化产生负面影响。

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