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首页> 外文期刊>Journal of Materials Engineering and Performance >Cooling Environment Effect on the Microstructure and Mechanical Properties of Friction Stir-Welded Joints
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Cooling Environment Effect on the Microstructure and Mechanical Properties of Friction Stir-Welded Joints

机译：冷却环境对摩擦搅拌接头微观结构和机械性能的影响

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摘要

The heat input in friction stir welding (FSW) influences the localized properties in welded joint. The external cooling during FSW reduces the localized heating and post-weld cooling time by extracting heat comparatively at a faster rate. In the present study, we have investigated the effect of different cooling environments on the performance of friction stir-welded (FSWed) AA5052 strain-hardenable aluminum alloy. Welding was performed under three different cooling environments such as natural air, water and liquid nitrogen in order to understand their effects on grain structure, metallurgical changes and mechanical properties of the joints. It has been noted that the width of weld nugget zone, thermo-mechanically affected zone and heat-affected zone has been decreased with the respective change in cooling environments. Welding speed could also influence the width of different zones in weldment alike the cooling environments. Finer grain size has been noticed with water cooling against the liquid nitrogen cooling. Comparatively, water was observed to be more favorable cooling environment against liquid nitrogen because of its better weld quality (97%) compared with base metal. The favorable mechanical properties resulting from the different weldment regions for different cooling environments have been elaborated in the present study.
机译：摩擦搅拌焊接（FSW）中的热输入影响焊接接头中的局部特性。在FSW期间的外部冷却通过以更快的速率提取热量来降低局部加热和焊接后冷却时间。在本研究中，我们研究了不同冷却环境对摩擦搅拌焊接（FSWED）AA5052应变铝合金的性能的影响。焊接在三种不同的冷却环境中进行，例如天然空气，水和液氮，以了解它们对晶粒结构的影响，接头的冶金变化和机械性能。已经注意到，随着冷却环境的各个变化，焊接掘金区，热机械受影响区域和热影响区域的宽度已经降低。焊接速度也可能影响焊接中不同区域的宽度。对液氮冷却的水冷却已经注意到更细粒尺寸。相比之下，由于其与基础金属相比，其抗液氮对液氮更有利的冷却环境是更有利的冷却环境。在本研究中详细阐述了由不同焊接区域产生的不同焊接区域产生的有利机械性能。

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