Microstructure and notched tensile fracture of Ti–6Al–4V to Ti–4.5Al–3V–2Fe–2Mo dissimilar welds

Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

“…8c) [41]. An increase in the PWHT temperature beyond 480 °C resulted in a reduction in the FZ hardness of Ti-6-4/Ti-15-3 [41], Ti-6-4/Ti-6-6-2 [39], Ti-6-4/SP700 [40] DTWs as shown in Fig. 7.…”

“…In LBW, a combination of optimum weld parameters may lead to a complete martensitic transformation and can be observed in the FZ of CO 2 laser welds of Ti-6-4/SP-700 DTWs in Fig. 6c [40]. The extent of martensitic transformation in the FZ of DTWs is also dependent on the amount of β stabilizers in the two alloys.…”

“…7 that in the DTW of Ti-6-4/Ti-15-3, PWHT up to 427 °C results in the highest increase in microhardness (from 289 HV at room Fig. 7 Influence of the PWHT temperatures on the microhardness of the FZ in different welds Ti-6-4/Ti-15-3 [41], Ti-6-4/Ti-6-6-2 [39], Ti-6-4/SP700 [40] temperature to nearly 483 HV at 427 °C) as compared to Ti-6-4/Ti-6-6-2 (from 380 HV at room temperature to around 412 HV at 483 °C) or Ti-6-4/SP700 (from 398 HV at room temperature to approximately 437 HV at 478 °C). This is because of the high Mo EQ of approximately 13.8 in the parent metal of Ti-15-3 as shown in Fig.…”

“…7. This was because of the formation of platelet α and growth of the thick α-layer at the grain boundaries in the FZ of DTWs [39][40][41].…”

Joint properties of friction welded joint between pure magnesium and pure aluminium with post-weld heat treatment

“…In addition, the intermediate layer (interlayer) consisting of a brittle intermetallic compound (IMC) will generate at the joint interface of both dissimilar metals, so that IMC interlayer will give fatal damage to equipments [1]. Some researchers had reported the mechanical and metallurgical properties of dissimilar joint, which was made with various welding method subjected to PWHT such as friction welding [2][3][4], friction stir welding [5][6][7], explosion welding [8], laser welding [9][10][11], electron beam welding [12,13], and arc welding [14][15][16]. However, even the PWHT condition of dissimilar joint made by friction welding method that has less generating IMC interlayer at the weld interface, has not been fully clarified.…”