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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
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-15 , DOI: 10.1007/s11665-020-05116-x
P. Shahsavari , H. R. Rezaei Ashtiani

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.



中文翻译:

预热和冷却速率对AA5083-H321铝合金钨极惰性气体保护焊缝组织和力学性能的影响

在钨极惰性气体保护焊中进行了各种预热处理和冷却速率条件,以研究AA5083-H321铝合金焊接接头的力学性能和组织演变。显微组织分析表明,在不同的预热和冷却速率下,焊接过程中晶粒大小各不相同。最高的预热温度导致树枝状晶粒增大,并且在最快的冷却速率下会形成较小的晶粒。同样,在拉伸性能和硬度焊缝上也留下了质感和晶粒尺寸。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率条件有明显的关系。这些区域的显微硬度通过增加冷却速率和降低预热温度而增加。较高的预热对焊接接头不同区域的硬度和宽度产生负面影响。结果表明,冷却速率对焊接试样的力学性能有显着影响。

更新日期:2020-09-16
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