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首页> 外文期刊>Journal of Materials Engineering and Performance >Aging of a New Niobium-Modified MAR-M247 Nickel-Based Superalloy
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Aging of a New Niobium-Modified MAR-M247 Nickel-Based Superalloy

机译：新型铌改性的MAR-M247镍基高温合金的时效

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MAR-M247 is a nickel-based superalloy that contains 3 wt.% Ta (weight percent of tantalum). Considering the chemical similarity between tantalum and niobium (Nb) and the lower cost of Nb, a modified MARM247 superalloy was produced with total replacement of Ta by Nb in this work. The samples were previously solutioned at 1260℃ for 8 h and then aged at different times (between 5 and 80 h) and temperatures (between 780 and 980℃). The microstructures of the aged samples were characterized with a scanning electron microscope (SEM and FEG-SEM, both with EDS). Simulations of the MC carbide and γ' fraction and the Ta and Nb content in both MC carbide and γ' phase were performed with Thermo-Calc software (TT_Ni8 database) and simulations of the γ' growth rate and γ' mean diameter were performed with JMatPro software. MC carbide with high Hf content was observed in all the aged samples, in agreement with thermodynamic simulation results. The equilibrium γ' fraction decreases from 67 mol.% at 780℃ to 52 mol.% at 980℃. Good agreement between the calculated and experimentally determined γ' particle size was also found. The growth rate of γ' at 980℃ is about 8 times higher than that at 780℃ and 3 times higher than that at 880℃. The hardness values do not change considerably after aging at 780 and 880℃. However, these values decrease significantly after aging at 980℃.
机译：MAR-M247是一种镍基高温合金，其中包含3 wt。％的Ta（钽的重量百分比）。考虑到钽和铌（Nb）的化学相似性以及Nb的成本较低，因此生产了一种改性MARM247高温合金，在这项工作中Ta被Nb完全替代。样品预先在1260℃下固溶8 h，然后在不同的时间（5到80 h）和温度（780到980℃）之间老化。用扫描电子显微镜（SEM和FEG-SEM，均用EDS）表征老化样品的微观结构。使用Thermo-Calc软件（TT_Ni8数据库）对MC碳化物和γ'分数以及MC碳化物和γ'相中的Ta和Nb含量进行模拟，并利用JMatPro软件。在所有老化的样品中均观察到高Hf含量的MC碳化物，与热力学模拟结果一致。平衡γ′分数从780℃的67mol。％降低到980℃的52mol。％。在计算和实验确定的γ'粒度之间也发现了很好的一致性。 980℃时γ'的生长速率是780℃时的约8倍，是880℃时的3倍。在780和880℃时效后，硬度值变化不大。然而，这些值在980℃下老化后会显着降低。

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