Microstructural influence on high-temperature oxidation of near-α titanium alloys: Timetal 834 and 6242S

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-06-14 DOI:10.1016/j.corsci.2025.113081

D. Kuczyńska-Zemła , M.C. Marco de Lucas , L. Lavisse , M.R. Zemła , F. Herbst , V. Pacorel , P. Kwaśniak

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Abstract

In this study, the oxidation behavior of two titanium alloys designed for high-temperature applications, Timetal 834 and Timetal 6242S, was compared. Both are classified as near-

α

alloys and possess alloying elements significantly enhancing their resistance to high-temperature oxidation. Applied oxidation routine included 100 and 500 hours of prolonged thermal processing in ambient dry air at 600, 650, and 700 °C. Such treated materials were investigated using complementary techniques: optical microscopy, scanning electron microscopy, electron/wave dispersive spectrometry, X-ray diffraction, and Raman spectroscopy. The results revealed that different oxide layer growth, between the two analyzed alloys, during high-temperature exposure was strongly related to their microstructures, and especially the arrangement of

α

and

β

phases. For longer exposure time (500 h), the Ti834 alloy showed better oxidation resistance, despite the formation of micrometric nodules on its surface during oxidation, which were not observed in the Ti6242S alloy. The presented data clearly indicate the important role of the microstructure as a source of solute elements that control the structure and stoichiometry of the oxide layer and, consequently, the oxidation resistance.

Abstract Image

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Timetal 834和6242S对近α钛合金高温氧化的组织影响

本研究比较了Timetal 834和Timetal 6242S两种高温钛合金的氧化行为。这两种合金都属于近α合金，它们含有的合金元素显著增强了它们的耐高温氧化性。应用氧化程序包括在600、650和700°C的环境干燥空气中进行100和500小时的长时间热加工。使用光学显微镜、扫描电子显微镜、电子/波色散光谱、x射线衍射和拉曼光谱等互补技术对这种处理过的材料进行了研究。结果表明，两种合金在高温暴露过程中氧化层生长的不同与其显微组织，尤其是α和β相的排列密切相关。当暴露时间较长（500 h）时，Ti834合金表现出较好的抗氧化性，但其表面在氧化过程中会形成微观结节，这是Ti6242S合金所没有的。所提供的数据清楚地表明，微观结构作为溶质元素的重要来源，控制着氧化层的结构和化学计量，从而控制着抗氧化性。

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

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.