The Effect of Re Content on Microstructure and Creep Resistance of Single Crystal Castings Made of Nickel-Based Superalloys

Advances in Science and Technology Research Journal Pub Date : 2024-02-01 DOI:10.12913/22998624/178463

K. Gancarczyk, Robert Albrecht, Małgorzata Kawalec, B. Kościelniak, Andrzej Gradzik, D. Szeliga, A. Kawalec, W. Ziaja, M. Motyka

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Abstract

In this work the effect of crystal structure perfection on the creep resistance of single crystal superalloys. The CMSX-4 and CMSX-4 ® Plus with increased Re content is analyzed. Single crystal rods are made by directional so - lidification process at the withdrawal rates 3 and 5 mm/min. The evaluation of microstructure and crystal structure perfection are carried out by light microscopy and X-ray diffraction Ω-scan methods. Creep tests are performed according to ASTM E-139-11 standard at the temperature of 982 °C. Mathematical models for the creep resistance of the models are developed for both investigated superalloys. The influence of the crystal structure on the the in - vestigated superalloys are built and the steady state creep rates are determined. Creep strength of both superalloys are compared. The results show that the CMSX-4 ® Plus nickel superalloy exhibits nearly two times higher creep resistance compared to the conventional CMSX-4 one.

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Re 含量对镍基超级合金单晶铸件微观结构和抗蠕变性的影响

本研究分析了晶体结构的完善性对单晶超合金抗蠕变性的影响。分析了 Re 含量增加的 CMSX-4 和 CMSX-4 ® Plus。单晶棒是在 3 毫米/分钟和 5 毫米/分钟的抽出速度下通过定向硬化工艺制成的。采用光学显微镜和 X 射线衍射 Ω 扫描方法对微观结构和晶体结构的完美性进行评估。蠕变试验根据 ASTM E-139-11 标准在 982 °C 温度下进行。为两种被研究的超合金建立了抗蠕变模型的数学模型。建立了晶体结构对所研究超合金的影响，并确定了稳态蠕变速率。比较了两种超合金的蠕变强度。结果表明，CMSX-4 ® Plus 镍超合金的抗蠕变性比传统的 CMSX-4 高出近两倍。

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Advances in Science and Technology Research Journal

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