• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Investigation of through thickness microstructure and mechanical properties in friction stir welded 7N01 aluminum alloy plate
【24h】

Investigation of through thickness microstructure and mechanical properties in friction stir welded 7N01 aluminum alloy plate

机译：搅拌摩擦焊接7N01铝合金板的穿透层组织和力学性能研究。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An on-going problem in friction stir welded (FSW) joints used in the high-speed train sector is that the microstructure and mechanical properties can significantly vary in thick sections. Because inhomogeneous properties can reduce weld efficiency and degrade service performance, it is of some interest to understand how in homogeneous properties can develop in FSW welds made from precipitation hardening alloys such as 7N01. In the current study, butt welds were made using 12 mm thick plates and then sectioned perpendicular to the weld line. Five 2.2 mm thick slices were cut from a section and used to measure tensile properties access the weld thickness. The microstructure was characterized using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) to measure variation in grain size and second phase particle distributions over the weld zone. Results showed that, with the exception of the top slice, yield strength (sigma(y)) and ultimate tensile strength (sigma(UTS)) obtained from the slices were fairly consistent and comparable to values from the full weld. Elongation (delta) was maximum at mid-thickness decreased significantly towards the crown. Although significantly reduced elongation was found at the top of the weld, and likely limits overall weldment ductility, elongation of the full FSW weld was improved over that of the base metal and can be attributed to enhanced post-necking straining. The finest grains and second phase particles were observed at mid-thickness. In comparison, the coarsest grains were observed at the top of the nugget. This microstructural variation can be understood by considering the temperature and strain field gradients that are generated in the plasticized zone. It is expected that the findings will help to promote a better understanding of post-weld microstructure development and mechanical properties of thick plates.
机译：在高速列车领域中使用的搅拌摩擦焊（FSW）接头中存在的一个持续问题是，在厚壁区域中，显微组织和机械性能会发生显着变化。由于不均匀的性能会降低焊接效率并降低使用性能，因此了解如何在由沉淀硬化合金（例如7N01）制成的FSW焊接中如何发展均匀性能会引起一些兴趣。在当前的研究中，对接焊缝是使用12 mm厚的钢板制成的，然后垂直于焊缝切开。从一个截面上切下五个2.2毫米厚的切片，用于测量接近焊接厚度的拉伸性能。使用扫描电子显微镜（SEM）和能量色散光谱（EDS）对显微组织进行表征，以测量焊接区晶粒尺寸和第二相颗粒分布的变化。结果表明，除顶部切片外，从切片获得的屈服强度（sigma（y））和极限抗拉强度（sigma（UTS））相当一致，可与全焊缝的值相媲美。厚度中部处的伸长率（δ）最大，朝向冠部明显降低。尽管在焊缝的顶部发现延伸率显着降低，并且可能限制了整体焊件的延展性，但与基本金属相比，完整的FSW焊缝的伸长率得到了改善，并且可以归因于颈缩后应变的增加。在中等厚度时观察到最细的晶粒和第二相颗粒。相比之下，在熔核顶部观察到最粗的晶粒。通过考虑在塑化区中产生的温度和应变场梯度可以理解这种微结构变化。预期这些发现将有助于增进对厚板焊接后微结构发展和力学性能的了解。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号