电塑性摩擦焊接过程的动态再结晶数值模拟

Numerical simulation of dynamic recrystallization of friction welding under electric field

关键词:  摩擦焊  热力耦合  动态再结晶  电场

Key words:  friction welding  coupled thermal-mechanical behavior  dynamic recrystallization  electric field

摘要:

摩擦焊过程中界面的塑性变形是摩擦焊的核心,文中以宇航工程常用的构件材料LY12合金为研究对象,建立了电场条件下棒状试件摩擦焊的热力耦合塑性成形有限元分析模型,获得了焊接过程中焊接界面处材料的温度场、应变场、应力场、电场强度等物理参量场,并应用Yada模型建立了LY12合金摩擦焊接过程显微组织的演化模型,计算了摩擦焊接过程动态再结晶区的分布及再结晶区晶粒的尺寸,并分析研究了上述场变量对电场条件下连续驱动摩擦焊成形工艺及成形件质量的影响。

Abstract:

The plastic deformation of welding interface material is the essence of friction welding.This paper studied the continuous driving friction welding of LY12 alloy that is often used as aerospace structure material.The plastic deformation on a rod sample of coupled thermal-mechanical analysis model under the electric field based on finite element method was established.Some physical parameter fields about the welding interface material,such as temperature field,strain field and electric field,were calculated.A Yada grain size model was used to predict dynamic recrystallization and grain size growth of the friction welding process.The welding process and the welding quality affected by these physical parameter fields was also analyzed.