Research of Microstructure and Mechanical Properties of Ti600/TC17 Inertia Friction Welding Joints

doi:10.3901/JME.2017.22.095

Abstract

Abstract: Ti600/TC17 is joined by inertia friction welding (IWF), and the microstructure and mechanical properties of joints is analyzed between as welded and post-weld heat treatment. In the TC17 side:Initial β grain is broken, and grain boundary and α phase is twisted in TC17 thermo-mechanical affect zone (TMAZ); smaller grain appears in initial β grain under the effect of dynamic recrystallization in the TC17 recrystallization zone (RZ); In the Ti600 side:lamina α cluster in the grain is distorted following metal extrusion. Initial lamina α cluster is divided into many smaller lamina α cluster. After heat treatment, lamina α appears in the metastable β phase in the TC17 side, and lamina α increase while it is not obviously. Microhardness increases after heat treatment, especially in the TC17 recrystallization zone. Tensile strength is similar to Ti600 basemen and fracture happen in the Ti600 side. Microstructure of fracture is typically cuppy.

Key words: dissimilar titanium joints, ineria friction welding, mechanical property, microstructure

CLC Number:

TG156

HE Jianchao, ZHANG Tiancang, HE Shengchun. Research of Microstructure and Mechanical Properties of Ti600/TC17 Inertia Friction Welding Joints[J]. Journal of Mechanical Engineering, 2017, 53(22): 95-100.

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