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首页> 外文会议>International Symposium on Friction Stir Welding >Influence of welding parameters and preheating temperature on abnormal grain growth after post-weld heat treatment in friction stir welding of 5083 Al alloys
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Influence of welding parameters and preheating temperature on abnormal grain growth after post-weld heat treatment in friction stir welding of 5083 Al alloys

机译：焊接参数和预热温度对5083铝合金摩擦搅拌焊接后焊接热处理后异常晶粒生长的影响

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摘要

The abnormal grain growth (AGG) during heat treatment in friction stir welds of aluminium alloys has been observed by several authors and some associated mechanisms have been identified. In spite of this understanding, only a few papers describe methods to limit or eliminate this AGG during heat treatment of friction stir welds in aluminium alloys. This study focuses on the influence of welding parameters and preheating temperature on AGG after heat treatment in 5083 aluminum alloys. Friction stir welding (FSW) parameters, as rotational and travel speed, have been varied in order to investigate a wide envelope of heat inputs during welding. It is shown that the extent of AGG depends strongly on the welding temperature and can be avoided with a good combination of welding and preheating parameters. However, care must be taken to avoid local melting in high heat input welds. Electron back-scattered diffraction (EBSD) was used to analyze the grain size and grain boundary orientation in samples prone or not to AGG. It was observed that the use of preheating narrowed the grain size distribution and reduced the mean misorientation of the low angle grain boundaries. This is in agreement with the explanation that AGG origins from a difference of mobility between subgrain boundaries.
机译：通过若干作者观察到铝合金摩擦搅拌焊缝中热处理期间的异常晶粒生长（AgG），并鉴定了一些相关机制。尽管有这种理解，但只有少数论文描述了在铝合金中摩擦搅拌焊缝的热处理期间限制或消除该AGG的方法。该研究侧重于5083铝合金热处理后焊接参数和预热温度对AGG的影响。已经改变了摩擦搅拌焊接（FSW）参数，作为旋转和行进速度，以便在焊接过程中进行宽包络。结果表明，AGG的程度强烈取决于焊接温度，并且可以用焊接和预热参数的良好组合来避免。但是，必须注意避免在高热输入焊缝中局部熔化。电子背散射衍射（EBSD）用于分析样品中的晶粒尺寸和晶界取向，易于或不为AgG。观察到预热的使用缩小了晶粒尺寸分布并降低了低角度晶界的平均错位。这与解释的说明是一致的，即AGG起源于子粒边界之间的移动性差异。

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