Linear friction welds of Ti–6Al–4V (TC4, according to Chinese classification) to Ti–6·5Al–3·5Mo–1·5Zr–0·3Si (TC11, according to Chinese classification) were subject to post-weld heat treatment (PWHT) at 650°C×4 h (PWHT1) and at 950°C×1 h+530°C×4 h (PWHT2) under air cooling. In the as welded joint, TC4 had recrystallised sufficiently compared to TC11. After PWHT1, the α grains in the TC4 weld centre zone grew to some extent and many superfine equiaxed recrystallised α grains precipitated along β boundaries on the TC11 side. The grain growth along the weld line in the weld centre zone under PWHT2 was evident. PWHT2 reduced the joint tensile strength due to the coarsening of the microstructure. The joint microhardness decreased after PWHT.
BußmannM and BayerE: ‘Market-oriented blisk manufacturing A challenge for production engineering’, Proc. 1st Eur. Air and Space Conf. (CEAS 2007), 2007.
2.
FrankelP, PreussM, SteuwerA, WithersPJ and BrayS: ‘Comparison of residual stresses in Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo linear friction welds’, Mater. Sci. Technol., 2009, 25, 640–650.
3.
VairisA and FrostM: ‘High frequency linear friction welding of a titanium alloy’, Wear, 1998, 217, 117–131.
4.
DaymondMR and BonnerNW: ‘Measurement of strain in a titanium linear friction weld by neutron diffraction’, Physica B, 2003, 325B, 130–137.
5.
TurnerR, GebelinJ.-C, WardRM and ReedRC: ‘Linear friction welding of Ti-6Al-4V: modelling and validation’, Acta Mater., 2011, 59, 3792–3803.
6.
PreussM, Quinta da FonsecaJ, SteuwerA, WangL, WithersPJ and BrayS: ‘Residual stresses in linear friction welded IMI550’, J. Neutron Res., 2004, 12, 165–173.
7.
KaradgeM, PreussM, LovellC, WithersPJ and BrayS: ‘Texture development in Ti-6Al-4V linear friction welds’, Mater. Sci. Eng. A, 2007, 459, 182–191.
8.
RomeroJ, AttallahMM, PreussaM, KaradgeM and BraySE: ‘Effect of the forging pressure on the microstructure and residual stress development in Ti-6Al-4V linear friction welds’, Acta Mater., 2009, 57, 5582–5592.
9.
MaTJ, ZhongB, LiWY, ZhangY, YangSQ and YangCL: ‘On microstructure and mechanical properties of linear friction welded dissimilar Ti-6Al-4V and Ti-6·5Al-3·5Mo-1·5Zr-0·3Si joint’, Sci. Technol. Weld. Join., 2012, 17, 9–12.
10.
MaTJ, LiWY, ZhongB, ZhangY and LiJL: ‘Effect of PWHT on microstructure and property of linear friction welded Ti17 titanium alloy joint’, Sci. Technol. Weld. Join., 2012, 17, 180–185.
11.
LiWY, MaTJ, ZhangY, XuQZ, LiJL, YangSQ and LiaoHL: ‘Microstructure characterization and mechanical properties of linear friction welded Ti-6Al-4V alloy’, Adv. Eng. Mater., 2008, 10, 89–92.
12.
MaTJ, ChenT, LiWY, WangSW and YangSQ: ‘Formation mechanism of linear friction welded Ti-6Al-4V alloy joint based on microstructure observation’, Mater. Charact., 2011, 62, 130–135.
13.
Edit committee of China Aeronautical Materials Handbook: ‘China Aeronautical Materials Handbook’, 2nd edn, vol. 4, ‘Titanium alloys and Copper alloys’, 147–148; 1990, Beijing, Standards Press of China.
14.
VairisA and FrostM: ‘On the extrusion stage of linear friction welding of Ti-6Al-4V’, Mater. Sci. Eng. A, 1999, A271, 477–484.
15.
WanjaraP and JahaziM: ‘Linear friction welding of Ti-6Al-4V: processing, microstructure, and mechanical-property inter-relationships’, Metall. Mater. Trans. A, 2005, A36, 2149–2164.
16.
LangB, ZhangTC, LiXH and GuoDL: ‘Microstructural evolution of a TC11 titanium alloy during linear friction welding’, Mater. Sci., 2010, 45, 6218–6224.
17.
LiWY, MaTJ and LiJL: ‘Numerical simulation of linear friction welding of titanium alloy: Effects of processing parameters’, Mater. Des., 2010, 31, 1497–1507.
18.
CallisterWDJr: ‘Materials Science and Engineering: An Introduction’, 7th edn, 188–198; 2007, New York, John Wiley & Sons.
19.
WenGD, MaTJ, LiWY, WangSQ, GuoHZ and ChenDL: ‘Strain-controlled fatigue properties of linear friction welded dissimilar joints between Ti-6Al-4V and Ti-6·5Al-3·5Mo-1·5Zr-0·3 Si alloys’, Mater. Sci. Eng. A, 2014, A612, 80–88.
