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首页> 外文期刊>Indian Journal of Science and Technology >Microstructure, Hardness and Wear Rate of A356 Aluminium Alloy Surface Alloyed with Nitrided Titanium using GTA
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Microstructure, Hardness and Wear Rate of A356 Aluminium Alloy Surface Alloyed with Nitrided Titanium using GTA

机译：GTA合金化渗氮钛合金的A356铝合金的组织，硬度和磨损率

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Background/Objectives: The study aims to improve surface properties of aluminium A356 alloy by surface alloying it with nitrided titanium, in a nitrogen environment, using Gas Tungsten Arc (GTA) as heat source. Methods/Statistical Analysis: Nitrided titanium sheets were surface alloyed with cast aluminium A356 blocks, in nitrogen environment, with GTA as heat source for melting. The cross-sectional microstructure of the specimens was studied using inverted metallurgical microscope. Further analysis was carried out using SEM/EDS to identify the formation of nitrides and intermetallic compounds. The hardness of the specimens was measured using Vickers hardness tester and the wear rate was determined using pin-on-disc wear tester. Findings: Microstructure analysis revealed a uniform and granular refined structure in the modified layer compared to the coarse and dendritic structure of the cast block. EDS analysis indicated the formation of hard-intermetallic compounds. The hardness was measured to be highest at the surface of the central fusion zone, with a maximum value of 656 HV while as-cast aluminium block exhibited only 76 HV. The measured wear rate was 10×10 -4 mm 3 /m for the modified layer, compared to 52×10 -4 mm 3 /m of the substrate. Alongside, the loss in weight after wear dropped by 4 mg. The coefficient of friction of the modified surface showed a constant trend during the wear-off period. The enhancement in these surface properties is attributed to the formation of nitrides and other intermetallic compounds that in the modified layer during surface alloying. Additionally, the use of GTA as heat source renders the surface alloying process to be economically feasible relative to other employable methods. Applications/Improvements: The devised surface alloying method used to enhance the surface properties of A356 is cheap, flexible and effective and finds intensive application in marine, automotive and manufacturing sectors.
机译：背景/目的：该研究旨在通过在氮气环境中使用钨极电弧（GTA）作为热源，通过将氮化铝与氮化钛表面合金化来改善铝A356合金的表面性能。方法/统计分析：在氮环境下，以GTA作为熔化的热源，将氮化钛板与铸铝A356块表面合金化。使用倒置金相显微镜研究了样品的横截面微观结构。使用SEM / EDS进行了进一步分析，以确定氮化物和金属间化合物的形成。使用维氏硬度计测量样品的硬度，并使用针式圆盘磨损测试仪确定磨损率。结果：显微组织分析显示，与铸坯的粗大和树枝状结构相比，改性层具有均匀且颗粒状的细化结构。 EDS分析表明形成了硬金属间化合物。在中央熔合区的表面测得的硬度最高，最大值为656 HV，而铸铝块仅显示76 HV。与基材的52×10 -4 mm 3 / m相比，改性层的测量磨损率为10×10 -4 mm 3 / m。同时，磨损后的重量损失减少了4 mg。改性表面的摩擦系数在磨损期间显示出恒定的趋势。这些表面性能的提高归因于在表面合金化过程中在改性层中形成的氮化物和其他金属间化合物。另外，使用GTA作为热源使得表面合金化工艺相对于其他可采用的方法在经济上是可行的。应用/改进：用于增强A356的表面性能的设计表面合金化方法便宜，灵活且有效，并且在船舶，汽车和制造业领域得到广泛应用。

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