The effects of forging pressure and temperature field on residual stresses in linear friction welded Ti6Al4V joints
Received date: 2016-05-31
Revised date: 2016-10-31
Online published: 2016-12-25
Supported by
The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51405389);the Fundamental Research Funds for the Central Universities (Grant No. 3102014JC02010404) and the Research Fund of the State Key Laboratory of Solidification Processing (Grant No. 122-QZ-2015).
Linear friction welding (LFW), as a solid state joining process, has been developed to manufacture and repair blisks in aeroengines. The residual stresses after welding may greatly influence the performance of the welded components. In this paper, the distribution of residual stresses in Ti6Al4V joints after LFW was investigated with numerical simulations. The effects of applied forging pressure and temperature field at the end of the oscillating stages on the residual stresses within the joints were investigated. The results show that, the residual tensile stresses at the welded interface in the y-direction are the largest, while the largest compressive stresses being present at the flash root in the z-direction. Furthermore, the forging pressure and temperature field at the end of the oscillating stages strongly affect the magnitude of the residual stresses. The larger forging pressure produced lower residual stresses in the weld plane in all three directions (x-, y-, and z-directions). Larger variance, σ, which decides the Gaussian distribution of the temperature field, also yields lower residual stresses. There is good agreement between simulation results and experimental data.
Key words： Linear friction welding(LFW); Modeling; Residual stress; Forging pressure
Ying Fu , Wen-Ya Li , Xia-Wei Yang , Tie-Jun Ma , Achilles Vairis . The effects of forging pressure and temperature field on residual stresses in linear friction welded Ti6Al4V joints[J]. Advances in Manufacturing, 2016 , 4(4) : 314 -321 . DOI: 10.1007/s40436-016-0161-6
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