Effect of post-weld heat treatment on microstructure and properties of electron beam welded joint of Ti₂AlNb/TC11

Abstract

The present paper reports the influence of post-weld heat treatment (PWHT) on microstructure and properties of electron beam welded dissimilar joint. Ti2AlNb and TC11 alloys were used to fabricate the joints. Three PWHTs were applied to the welded joints. The structures were analysed using optical microscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The results show that weld metal of the fusion zone is mainly composed of α2 and β phases. As the energy input increases under different PWHTs, the decomposition degree of metastable phases ( α′/ β) rises, but the tensile strength and impact toughness of the joint reduce. Under each condition, the tensile strength of the joint is higher than that of the TC11 base metal.

Microstructure characteristics and mechanical properties of laser-TIG hybrid welded dissimilar joints of Ti–22Al–27Nb and TA15

“…(2) since the thermal physical properties of the mature materials such as TA15 has already been extensively investigated [15]. When concerning the dissimilar welding process of Ti 2 AlNb-based alloys and other titanium alloys, most literature has focused on electron beam welding (EBW) [16][17][18]. Laser-TIG-hybrid-welding (TIG -tungsten inert gas) combines the advantages of laser and arc, presents superior welding flexibility to EBW and LBW and has been proved to be an effective welding process to join titanium alloys [19].…”

Preparation and Mechanical Properties of Ceramic Fiber Reinforced Titanium-Based Hybrid Laminated Composite

“…e specific analysis shows that there are no Al and Nb elements in the ductile metal Ti matrix (i.e., Region 1). Besides, during the hot working of the composite, these two elements, which are α and β stable elements of Ti, respectively, gradually spread from Region 4 to Region 1. erefore, the microstructures of α + β biphase are formed in Region 2 on the side of the ductile metal Ti layer; and the microstructures of rich B2 phase with "abundant Nb and insufficient Al" are formed in Region 3 on the side of the intermetallic Ti 2 AlNb layer [22][23][24][25].…”

Effect of isothermal deformation on microstructure and properties of electron beam welded joint of Ti2AlNb/TC11

“…The effect of post-weld heat treatment on microstructure and properties of the joint had also been studied. 11 The results showed that after different postweld heat treatments, the ductility of the joint decreased linearly as the energy input increases. This was attributed to the decomposition of ductile metastable b phase, which transformed into brittle azO phases in the fusion zone (FZ).…”