Boriding influence on cyclic oxidation of CrFeMnNbNi high entropy alloy

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-11-15 DOI:10.1016/j.surfcoat.2024.131564

Kadir Mert Döleker , Ali Günen , Azmi Erdoğan

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Abstract

Boriding is often used to improve the wear resistance of metals and alloys and successful results are obtained. Although boriding increases the wear resistance in HEAs, it is also important to know the oxidation behavior, especially for high temperature applications. In order to determine the cyclic oxidation behavior of boriding in HEAs, alloy CrFeMnNbNi was subjected to boriding in this study. In the CrFeMnNbNi alloy that was produced by arc melting, three phases were detected as FeNi, FeCr and Laves in the post-production analysis. With the pack boriding process, a boride zone of approximately 30–35 μm thickness and a diffusion zone of 28–33 μm consisting of different types of borides (M_xB_y) were obtained on the surface. Both HEA and borided-HEA were exposed to cyclic oxidation experiments up to 45 h at 900 °C. Mn, which has a high affinity to oxygen, caused the formation of oxides containing predominantly Mn. The presence of boride phases in the subsurface regions changed the formed oxide products. In the borided sample, oxide formations containing Mn-Fe-B were detected and showed rapid oxide growth. The oxide growth caused serious damage in some areas, weakening the oxidation resistance.

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硼化对 CrFeMnNbNi 高熵合金循环氧化的影响

硼化通常用于提高金属和合金的耐磨性，并取得了成功的结果。虽然硼化可以提高 HEA 的耐磨性，但了解其氧化行为也很重要，尤其是在高温应用中。为了确定硼化在 HEA 中的循环氧化行为，本研究对 CrFeMnNbNi 合金进行了硼化。在通过电弧熔化生产的 CrFeMnNbNi 合金中，在生产后分析中检测到三相：FeNi、FeCr 和 Laves。通过包硼工艺，在表面获得了约 30-35 μm 厚的硼化物区和 28-33 μm 的扩散区，这些扩散区由不同类型的硼化物（MxBy）组成。HEA 和硼化物-HEA 都在 900 °C 下进行了长达 45 小时的循环氧化实验。锰与氧的亲和力很高，会形成主要含锰的氧化物。次表层区域硼化物相的存在改变了形成的氧化物产物。在硼化物样品中，检测到含有 Mn-Fe-B 的氧化物形成，并显示出氧化物的快速增长。氧化物的生长在某些区域造成了严重破坏，削弱了抗氧化性。

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

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.