Microstructure and properties of inertia friction welding joint of TA18 titanium alloy tube
Inertial rotary friction welding(IRFW)research was conducted on TA18 titanium alloy tube.The microstructure of the IRFW joint of TA18 titanium alloy tube was observed using optical micro-scopy and scanning electron microscopy,and the characteristics and evolution mechanism of the micro-structure were analyzed in combination with the welding process.The mechanical properties of welded joints were analyzed using methods including tensile testing,impact testing,and microhardness testing.The results indicate that due to strong plastic deformation occurring at the welded joint in a short period of time,the microstructure of the welded zone of IRFW joint welded is mainly composed of needle-like α′phase.The microstructure of the thermal mechanical affected zone of IRFW joint welded is mainly composed of equiaxed α phase,needle-like α′phase and residual β phase.The tensile strength of the IR-FW joint of TA18 titanium alloy tube is equivalent to that of the base material,and the fracture posi-tions are all located far from the center of the weld zone.The microhardness of the IRFW joint is relat-ively uniform,and the hardness of each region can be matched.The impact toughness of the weld zone of the IRFW joint reached 96.85%of the base material.
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