J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (5): 824-832.DOI: 10.1016/j.jmst.2018.11.005

• Orginal Article • Previous Articles     Next Articles

Effects of welding speed on the multiscale residual stresses in friction stir welded metal matrix composites

X.X. Zhanga, L.H. Wua, H. Andräb, W.M. Ganc, M. Hofmannd, D. Wanga, D.R. Nia, B.L. Xiaoa, Z.Y. Maa?()   

  1. aShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    bFraunhofer Institute for Industrial Mathematics, Fraunhofer-Platz 1, Kaiserslautern 67663, Germany
    cGerman Engineering Materials Science Centre, Helmholtz-Zentrum Geesthacht, D-21502 Geesthacht, Germany
    dHeinz Maier-Leibnitz Zentrum (MLZ), Technische Universit&äMünchen, D-85747 Garching, Germany
  • Received:2018-06-11 Accepted:2018-09-28 Online:2019-05-10 Published:2019-02-20
  • Contact: Ma Z.Y.

Abstract:

The effects of welding speed on the macroscopic and microscopic residual stresses (RSes) in friction stir welded 17 vol.% SiCp/2009Al-T4 composite plates were studied via neutron diffraction and an improved decoupled hierarchical multiscale modeling methods. Measurements showed that the macroscopic and total RSes had the largest variations in the longitudinal direction (LD). Increasing the welding speed led to higher values of measured LD macroscopic and total RSes in the matrix. The welding speed also significantly influenced the distributions and magnitudes of the microscopic RSes. The RSes were predicted via an improved hierarchical multiscale model, which includes a constant coefficient of friction based thermal model. The RSes in the composite plates before friction stir welding (FSW) were computed and then set as the initial states of the FSW process during modeling. This improved decoupled multiscale model provided improved predictions of the temperature and RSes compared with our previous model.

Key words: Metal-matrix composites (MMCs), Friction stir welding, Residual/internal stress, Neutron diffraction, Finite element analysis (FEA), Multiscale simulation