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Effect of discharge voltage on the deformation of Ti Grade 1 rivet in electromagnetic riveting

机译：放电电压对Ti 1级铆钉电磁铆接变形的影响

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Discharge voltage is one of the most important parameters in electromagnetic riveting. The effect of discharge voltage on the deformation of Ti Grade 1 rivet was investigated by experiment from macro and micro-scales in low voltage electromagnetic riveting. The result shows that the amplitude of the discharge current, the riveting force and the rivet deformation increases with the discharge voltage. The deformation in the rivet head is inhomogeneous and there are three deformation zones, viz., large, small and difficult deformation zones. The deformation in rivet shaft is quite uniform. The deformation of Ti Grade 1 rivet is an adiabatic process and the deformation mechanism is adiabatic shearing deformation. With the increase of discharge voltage, adiabatic shear band gets more and more obvious and the grains inside the adiabatic shear band are elongated severely and re-arranged along the direction of the adiabatic shear band. A model for the modeling of grain deformation inside the adiabatic shear band is proposed. When the adiabatic temperature does not affect the flow of the material, the process of microstructure evolution mechanism of Ti Grade 1 rivet in electromagnetic riveting is mainly the twinning deformation. With the increase of rivet deformation, it is the sub-grain rotation to complete the dynamic recrystallization. These findings provide an in-depth understanding of Ti Grade 1 rivet deformation mechanism and a basis for process determination and quality assurance of the electromagnetic riveting process.
机译：放电电压是电磁铆接中最重要的参数之一。通过宏观和微观尺度的低压电磁铆接实验，研究了放电电压对Ti 1级铆钉变形的影响。结果表明，放电电流的幅度，铆接力和铆钉变形随放电电压的增加而增大。铆钉头中的变形是不均匀的，并且存在三个变形区，即大，小和困难的变形区。铆钉轴的变形非常均匀。 Ti 1级铆钉的变形是绝热过程，变形机理是绝热剪切变形。随着放电电压的增加，绝热剪切带越来越明显，绝热剪切带内部的晶粒急剧伸长，并沿绝热剪切带的方向重新排列。提出了绝热剪切带内晶粒变形的模型。当绝热温度不影响材料流动时，Ti 1级铆钉在电磁铆接中的组织演变机理过程主要是孪生变形。随着铆钉变形的增加，完成动态再结晶的是亚晶粒旋转。这些发现提供了对Ti 1级铆钉变形机理的深入了解，并为电磁铆接工艺的工艺确定和质量保证提供了基础。

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