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Precipitation evolution and creep strength modelling of 25Cr20NiNbN austenitic steel

机译：25Cr20NiNbN奥氏体钢的析出演化和蠕变强度模型

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25Cr-20Ni-Nb-N is a high strength and oxidation-resistant austenitic stainless steel intended for Ultra-Supercritical (USC) power plants. In this work, the precipitation evolution, and creep strength at 650 and 750 degrees C for up to 100 000 h are predicted. Six precipitates are considered in the thermokinetic calculation by MatCalc: M23C6, eta (Cr3Ni2SiN), sigma, G, Z, Nb(C, N). For the creep strength prediction, three hardening mechanisms are taken into account: dislocation, precipitation, and solid solution hardening. Both matrix composition and precipitation evolution, calculated with MatCalc, are used for modelling the precipitation and solid solution hardening. It is found that the dislocation hardening, followed by precipitation hardening gives the largest contribution to the creep strength. The most important precipitates strengthening phases are found to be Z-Phase and Nb(C, N), which are nucleated at the dislocations. The model for the creep rate can represent how the creep exponent is raised with increasing applied stress and reduced temperature.
机译：25Cr-20Ni-Nb-N是用于超超临界（USC）电厂的高强度和抗氧化奥氏体不锈钢。在这项工作中，预测了在650和750摄氏度下长达10万小时的降水演变和蠕变强度。 MatCalc在热动力学计算中考虑了六种沉淀物：M23C6，η（Cr3Ni2SiN），sigma，G，Z，Nb（C，N）。对于蠕变强度预测，考虑了三种硬化机理：位错，沉淀和固溶硬化。用MatCalc计算的基质组成和沉淀演变都用于对沉淀和固溶硬化进行建模。发现位错硬化，然后沉淀硬化对蠕变强度的贡献最大。发现最重要的析出物强化相为Z位相和Nb（C，N），它们在位错处成核。蠕变速率模型可以表示随着施加的应力增加和温度降低，蠕变指数如何升高。

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