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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Preheating and Cooling Rate on the Microstructure and Mechanical Properties of Tungsten Inert Gas Welded Joints of AA5083-H321 Aluminum Alloy
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Effects of Preheating and Cooling Rate on the Microstructure and Mechanical Properties of Tungsten Inert Gas Welded Joints of AA5083-H321 Aluminum Alloy

机译：预热和冷却速率对AA5083-H321铝合金钨惰性气体焊接接头微观结构和力学性能的影响

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摘要

Various preheating treatment and cooling rates conditions were carried out in Tungsten Inert Gas welding to study mechanical behavior and microstructural evolution of AA5083-H321 aluminum alloy welded joints. The microstructural analysis illustrated the diverse grain size during welding at different preheating and cooling rate. The highest preheat temperature caused to enlarge dendritic grains and during the fastest cooling rate formed the smaller grains. Also, the texture and grain size impressed on tensile behavior and hardness welds. Grain structure of the heat-affected zone, partially melted zone, and weld metal appeared to have a tangible relationship with preheating and cooling rate conditions. The microhardness of these regions increased by increasing the cooling rate and decreasing the preheating temperature. The high preheating had a negative effect on the hardness and width of different zones of welded joints. The results showed that the cooling rate has remarkable effects on the mechanical properties of the welded specimen.
机译：为了研究AA5083-H321铝合金焊接接头的力学行为和组织演变，在钨极惰性气体保护焊中进行了不同的预热处理和冷却速率条件。显微组织分析表明，在不同的预热和冷却速度下，焊接过程中晶粒尺寸不同。最高预热温度导致枝晶晶粒增大，在最快的冷却速度下形成较小的晶粒。此外，纹理和晶粒尺寸也会影响焊缝的拉伸性能和硬度。热影响区、部分熔化区和焊缝金属的晶粒结构似乎与预热和冷却速度条件有明显关系。这些区域的显微硬度随着冷却速度的增加和预热温度的降低而增加。高预热对焊接接头不同区域的硬度和宽度有负面影响。结果表明，冷却速度对焊接试样的力学性能有显著影响。

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