Competitive oxidation behavior of Ni-based superalloy GH4738 at extreme temperature

IF 5.6 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hui Xu, Shufeng Yang, Enhui Wang, Yunsong Liu, Chunyu Guo, Xinmei Hou, Yanling Zhang
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引用次数: 0

Abstract

A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200°C, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding, the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900–1100°C was predicted.

镍基超合金 GH4738 在极端温度下的竞争氧化行为
高推重比对镍基超级合金的高温性能提出了挑战。通过等温和非等温实验研究了 GH4738 在极端温度下的氧化行为。由于合金元素的竞争性扩散,氧化鳞片包括最外层的多孔氧化层(OOL)、内部相对致密的氧化层(IOL)和内部氧化区(IOZ),具体取决于温度和时间。高温导致 IOL/IOZ 界面形成大量空隙。在 1200°C 时,IOL 中富铬氧化层的连续性被破坏,因此发生了剥落。氧化时间的延长导致富铝氧化物颗粒的尺寸随着 IOZ 的增加而增大。根据这一发现,讨论了 GH4738 的氧化动力学,并预测了其在 900-1100°C 时的相应氧化行为。
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来源期刊
CiteScore
9.30
自引率
16.70%
发文量
205
审稿时长
2 months
期刊介绍: International Journal of Minerals, Metallurgy and Materials (Formerly known as Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material) provides an international medium for the publication of theoretical and experimental studies related to the fields of Minerals, Metallurgy and Materials. Papers dealing with minerals processing, mining, mine safety, environmental pollution and protection of mines, process metallurgy, metallurgical physical chemistry, structure and physical properties of materials, corrosion and resistance of materials, are viewed as suitable for publication.
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