Effect of pulse frequency on the microstructure and corrosion behavior of Ti-6Al-4V alloy fabricated by pulse arc remelting method

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

Surface & Coatings Technology Pub Date : 2025-04-12 DOI:10.1016/j.surfcoat.2025.132159

Rui Xiang , Jiankang Huang , Xiaoquan Yu , Xinyue Wang , Yuhang Xie , Tianxiang Zhao , Huayu Zhao , Shurong Yu , Ding Fan

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Abstract

This study employed the gas tungsten arc welding (GTAW) pulse arc remelting method to modify the surface of Ti-6Al-4V alloy, investigating the influence of pulse frequency on its microstructural evolution and corrosion behavior in a 3.5 wt% NaCl solution. The results indicate that the prior β grains gradually refine as the pulse frequency increases, and the width and spacing of α/α′ martensite decrease. Compared to the sample remelted at 25 Hz, the grain size of the sample remelted at 500 Hz decreased by 80.91 %, while the lath spacing and thickness reduced by 56.7 % and 27.9 %, respectively. The maximum surface microhardness of the remelted Ti-6Al-4V alloy reached 524 Hv. The alloy exhibited the best corrosion resistance at a pulse frequency of 100 Hz. However, when the pulse frequency exceeded 100 Hz, the excessively high grain boundary density intensified localized corrosion at the grain boundaries. The width of the α/α′ martensite phase is a key factor affecting the corrosion resistance of the Ti-6Al-4V alloy.

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脉冲频率对脉冲电弧重熔Ti-6Al-4V合金组织及腐蚀行为的影响

采用钨极气体保护焊（GTAW）脉冲电弧重熔方法对Ti-6Al-4V合金进行表面改性，研究了脉冲频率对合金在3.5 wt% NaCl溶液中组织演变和腐蚀行为的影响。结果表明：随着脉冲频率的增加，β晶粒逐渐细化，α/α′马氏体的宽度和间距减小；与25 Hz重熔试样相比，500 Hz重熔试样的晶粒尺寸减小了80.91%，板条间距和板条厚度分别减小了56.7%和27.9%。重熔Ti-6Al-4V合金的最大表面显微硬度达到524 Hv。在脉冲频率为100 Hz时，合金的耐蚀性最好。而当脉冲频率超过100 Hz时，过高的晶界密度加剧了晶界局部腐蚀。α/α′马氏体相宽度是影响Ti-6Al-4V合金耐蚀性能的关键因素。

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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.