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High temperature isothermal oxidation behaviour of an oxide dispersion strengthened derivative of IN625

机译:高温等温氧化行为的氧化物分散型强化衍生物IN625

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摘要

Gas atomised IN625 powder was mechanically alloyed with 1.0 Wt.% nano-yttria and consolidated by spark plasma sintering (SPS) to produce an oxide dispersion strengthened (ODS) alloy. The isothermal oxidation rate constant of the ODS alloy, and wrought IN625, was determined by thermogravimetric analysis. This was performed at 900 degrees C in static laboratory air for exposure times of up to 1000 h. It was found that the ODS alloy oxidised similar to 40x slower than wrought IN625, which is attributed to the reactive element effect. It is further proposed that the improvement in oxidation resistance of the ODS alloy, and the superior morphology of the oxide scale formed on the ODS alloy, may be related to the presence of Nb carbide, rather than delta-phase, in the ODS alloy.
机译:气体雾化In625粉末用& 1.0重量%的粉末机械合金合金。%纳米钇并通过火花等离子体烧结(SPS)固结以产生强化(ODS)合金的氧化物分散体。 通过热重分析确定ODS合金的等温氧化速率恒定,并在625中锻造。 这在900℃下在静态实验室空气中进行,用于暴露最多1000小时。 结果发现,与ROWED IN625相似的ODS合金与40倍较慢,其归因于反应性元素效应。 进一步提出,在ODS合金中改善ODS合金的抗氧化性,以及在ODS合金上形成的氧化物秤的优异形态可能与ODS合金中的Nb碳化物而不是DELTA相的存在有关。

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