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首页> 外文期刊>Journal of Materials Engineering and Performance >Enhancing Formability of AA2219 Aluminum Alloy Friction Stir Welded Blanks with Preheating Treatment
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Enhancing Formability of AA2219 Aluminum Alloy Friction Stir Welded Blanks with Preheating Treatment

机译：提高AA2219铝合金摩擦搅拌焊接坯料的可成形性，采用预热处理

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摘要

The deformation behaviors of FSW blank are complicated due to the incompatibility of the mechanical property and microstructure for the weld and base material. In order to improve the formability of friction stir welded (FSW) blanks, the weld and base material in this paper were subjected to preheating treatments of 250, 300, 350, 400, and 450?°C, plus a solution treatment of 535?°C. The deformation behavior of the AA2219 FSW blank was characterized using uniaxial tension, microhardness test, hydro-bulging test and electron backscattered diffraction to determine the relationship of the deformation property and microstructure for the FSW blanks. Full strain fields of the tensile and bulging specimens were used to analyze the deformation uniformity of the weld and base material under uniaxial tension and biaxial tension stress states. With the limiting bulging height under various preheating temperatures, the formability behavior of the weld and base material was analyzed during the whole bulging process. The optimum preheating temperature can increase the formability and refrain from abnormal grain growth of the weld on the premise of maintaining the weld strength. The limiting bulging height of FSW blank is obviously improved by the lower preheating temperature from 300 to 350?°C. Additionally, the weld position has a significant impact on the deformation of the whole FSW blanks.
机译：由于焊接和基材的机械性能和微观结构的不相容，FSW空白的变形行为是复杂的。为了提高摩擦搅拌焊接（FSW）坯料的可成形性，本文中的焊接和基材进行预热处理，预热处理为250,300,350,400和450Ω·°C，加上535的溶液处理？ °C。 AA2219 FSW坯料的变形行为用单轴张力，微硬度试验，水谐波测试和电子背散射衍射表征，以确定FSW坯料变形性能和微观结构的关系。使用拉伸和凸出标本的全应变场来分析单轴张力和双轴张力应力状态下焊接和基材的变形均匀性。利用各种预热温度下的限制凸出高度，在整个膨胀过程中分析了焊缝和基材的可成形性行为。最佳预热温度可以提高可成形性并在保持焊接强度的前提下提高焊缝的异常生长。 FSW坯料的限制凸出高度明显改善了300至350°C的预热温度较低。另外，焊接位置对整个FSW坯料的变形具有显着影响。

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