Abstract
Revealing the oxidation behavior of superalloys is crucial for optimizing material properties and extending service life. This study investigated the oxidation behavior of superalloy GH4738 under stress states at 850 °C. High-throughput specimens were fabricated to withstand different stresses at the same time. Isothermal oxidation samples were analyzed using the mass gain method to obtain oxidation kinetic curves. The results show that the external stress below 200 MPa could improve the oxidation resistance of the GH4738. With tensile stress increasing, the oxide layer becomes thinner, denser and more complete, while internal oxidation decreases. The tensile stress alters the structure of the external oxide layer from a two-layer to a three-layer configuration. The Cr2O3 oxide layer inhibits the outward diffusion of Ti, leading to Ti enrichment at the oxide–matrix interface and altering the oxidation mechanism of GH4738.
Graphical abstract
摘要
揭示高温合金的氧化行为对优化材料性能和延长材料使用寿命至关重要。本文研究了高温合金GH4738在850 °C拉应力状态下的氧化行为。通过制备高通量梯度样品可一次性试验获得不同应力状态的材料。采用重量增加法对等温氧化样品进行了分析,得到了氧化动力学曲线。结果表明,200 MPa以下的外部拉应力可以提高GH4738的抗氧化性能。随着拉伸应力的增加,氧化层变得更薄、更致密、更完整,而内部氧化深度减少。拉伸应力使得外部氧化膜从两层改变为三层结构。致密的Cr2O3氧化层抑制了Ti元素向外扩散,导致Ti在合金基体和外部氧化膜界面富集,改变了GH4738的氧化机制。
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Acknowledgements
This work was financially supported by the National Key R&D Program of China (No. 2021YFB3700401), Shandong Provincial Natural Science Foundation for Youths (No. ZR2022QE234), Zhejiang Provincial Natural Science Foundation (No. LQ21E030002) and the Youth Innovation team Project of Higher Education Institutions in Shandong Province (No. 2022KJ272).
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Hu, JC., Huang, HL., Wu, CC. et al. Oxidation behavior of Ni-based superalloy GH4738 under tensile stress. Rare Met. (2024). https://doi.org/10.1007/s12598-024-02715-8
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DOI: https://doi.org/10.1007/s12598-024-02715-8