The Effect of Nb, Ta, and Ti on the Oxidation of a New Polycrystalline Ni-Based Superalloy

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Oxidation of Metals Pub Date : 2024-01-30 DOI:10.1007/s11085-023-10218-7

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Abstract

The effect of variations in Nb, Ta, and Ti concentrations in exchange for Al on the oxidation resistance of a new polycrystalline Ni-based superalloy (C19) was studied in air at 800 °C for up to 1000 h. An external scale of Ti-doped Cr₂O₃ and a sub-scale of discontinuous Al₂O₃ intrusions formed on the surface of all the studied alloys. Contrary to other reports, increasing the Nb concentration improved the oxidation performance and may have promoted the formation of a CrTaO₄ layer, thereby reducing oxygen ingress. The addition of Ta also significantly improved oxidation resistance and reduced the depth of the Al₂O₃ intrusions. Increasing the Ti concentration did not significantly affect the oxidation performance, potentially due to the relatively low Ti concentrations investigated. Several of the studied alloys with modified Ta and Ti concentrations showed regions of continuous Al₂O₃ scale formation, suggesting that the compositions are in a transition regime between Cr₂O₃-forming and Al₂O₃-forming behaviour. The findings suggested that part of the Ti content in C19 could potentially be replaced with Nb, Ta and/or other elements to further enhance oxidation resistance and other desirable properties. Overall, the insights gained could serve as a guide to optimise the composition of C19 and similar alloys for enhanced oxidation resistance.

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Nb、Ta 和 Ti 对新型多晶镍基超级合金氧化的影响

摘要研究了 Nb、Ta 和 Ti 的浓度变化对新型多晶镍基超级合金 (C19) 在 800 °C 空气中最长 1000 小时的抗氧化性的影响。与其他报告相反，增加 Nb 的浓度可改善氧化性能，并可能促进 CrTaO4 层的形成，从而减少氧气的侵入。添加 Ta 还能显著提高抗氧化性，并减少 Al2O3 的侵入深度。提高钛浓度对氧化性能没有明显影响，这可能是由于所研究的钛浓度相对较低。所研究的几种具有改良的 Ta 和 Ti 浓度的合金显示出连续的 Al2O3 鳞片形成区域，这表明合金成分处于 Cr2O3 形成和 Al2O3 形成行为之间的过渡状态。研究结果表明，可以用 Nb、Ta 和/或其他元素替代 C19 中的部分 Ti 含量，以进一步提高抗氧化性和其他理想性能。总之，所获得的见解可作为优化 C19 和类似合金成分以增强抗氧化性的指南。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.