TC11和TC17钛合金线性摩擦焊接过程接头应力应变场研究

Study on Stress and Strain Fields of Linear Friction Welded Joints of TC11/TC17 Titanium Alloys During Welding process

采用Abaqus/explicit有限元软件,建立了二维刚塑性热力耦合有限元模型,对TC11(Ti-6.5Al-3.5Mo-1.5Zr-0.3Si)/TC17(Ti-4Mo-4Cr-5Al-2Sn-2Zr)异种钛合金线性摩擦焊接过程接头应力应变场进行了数值计算,探讨了焊接过程接头应力应变场的演变规律。结果表明:摩擦过程,界面热塑性金属在周期性拉压应力作用下,被挤出摩擦界面,在飞边处,轴向承受向上的拉应力和拉应变,界面方向受到向焊件内侧的压应力与压应变;顶锻阶段,应力值增大,应变值基本保持恒定。

Stress and strain fields during linear friction welding between TC11 （Ti-6.5Al-3.5Mo-1.5Zr-0.3Si） and TC17 （Ti-4Mo-4Cr-5Al-2Sn-2Zr） were investigated by means of ABAQUS/explicit with a two-dimensional （2D） rigid plastic model. The results show that thermoplastic metal are squeezed out from the interface under the action of cyclical tension and compression stress during the friction phase, and the flash bears the tensile stress and tensile strain upwards at the axial direction, as well as the compressive stress and compressive strain inside the workpiece at the interface. During the forging phase, the stress increases, while the strain keeps stable.