Effect of Carbonitriding on Tribomechanical and Corrosion-Resistant Properties of Friction Stir Welded Aluminium 2024 Alloy

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2021-11-01 DOI:10.2478/scjme-2021-0030

Priya, G. M. Kumar, P. Kumar

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Abstract

Abstract Friction stir welding (FSW) is extensively used to join aluminium alloys components in space and aircraft industries. Al 2024 is a heat-treatable aluminium alloy with copper as the primary alloying element which has good strength and fatigue resistance. This paper investigates the effect of carbonitriding surface modification on the hardness, tensile strength and impact strength of FSW welded Al 2024 joints. The friction stir welding was performed on three different sets of aluminium alloy (Al2024:Al2024, Al2024: carbonitrided-Al2024, carbonitrided-Al2024: carbonitrided-Al2024) at two different tool rotation speed (TRS) and two welding speed using cylindrical pin tool. The carbonitriding pre-treatment of Al-2024 alloy demonstrated significant improvement in the tensile strength, percentage elongation, abrasion wear resistance and corrosion resistance with the sacrifice of impact strength. The maximum tensile strength of all three sets of samples after FSW was recorded in descending order of (i) carbonitrided-Al2024:carbonitrided-Al2024 (ii) Al2024:Carbonitrided-Al2024 and (iii) Al2024:Al2024. The friction stir welded joint of carbonitrided aluminium alloy exhibited best abrasive wear resistant and corrosion resistant properties.

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碳氮共渗对搅拌摩擦焊接铝合金摩擦力学和耐腐蚀性能的影响

摘要搅拌摩擦焊(FSW)在航空航天工业中广泛应用于铝合金部件的连接。al2024是一种以铜为主要合金元素的可热处理铝合金，具有良好的强度和抗疲劳性能。研究了碳氮化表面改性对FSW焊接Al - 2024接头硬度、抗拉强度和冲击强度的影响。在两种不同的刀具转速(TRS)和两种焊接速度下，采用圆柱销刀对三组不同的铝合金(Al2024:Al2024:碳氮化-Al2024、碳氮化-Al2024:碳氮化-Al2024)进行搅拌摩擦焊接。Al-2024合金经碳氮共渗预处理后，其抗拉强度、伸长率、耐磨性和耐蚀性均有显著提高，但冲击强度有所降低。三组试样经过FSW后的最大拉伸强度由大到小依次为:(i) carbonitrid -Al2024:carbonitrid -Al2024; (ii) Al2024:carbonitrid -Al2024; (iii) Al2024:Al2024。碳氮化铝合金搅拌摩擦焊接接头具有较好的磨粒磨损和耐腐蚀性能。

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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Strojnícky časopis - Journal of Mechanical Engineering

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