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

doi:10.1016/j.jmst.2018.11.005

材料科学与技术 ›› 2019, Vol. 35 ›› Issue (5): 824-832.DOI: 10.1016/j.jmst.2018.11.005

收稿日期:2018-06-11 接受日期:2018-09-28 出版日期:2019-05-10 发布日期:2019-02-20

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

X.X. Zhang^a, L.H. Wu^a, H. Andrä^b, W.M. Gan^c, M. Hofmann^d, D. Wang^a, D.R. Ni^a, B.L. Xiao^a, Z.Y. Ma^a^?()

^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.

摘要/Abstract

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

. [J]. 材料科学与技术, 2019, 35(5): 824-832.

X.X. Zhang, L.H. Wu, H. Andrä, W.M. Gan, M. Hofmann, D. Wang, D.R. Ni, B.L. Xiao, Z.Y. Ma. Effects of welding speed on the multiscale residual stresses in friction stir welded metal matrix composites[J]. J. Mater. Sci. Technol., 2019, 35(5): 824-832.

图/表 10

Table 1 Coordinates of ten macro-micro points.

Macro-micro point	Coordinates (mm)
Macro-micro point	T	L	N
P0	0	150	1.55
P1	2	150	1.55
P2	4	150	1.55
P3	6	150	1.55
P4	8	150	1.55
P5	10	150	1.55
P6	12	150	1.55
P7	22	150	1.55
P8	32	150	1.55
P9	42	150	1.55

Fig. 1 Computational domains used in multiscale modeling [14]: (a) MMC plate, only the right half is modeled. Symmetry boundary conditions are imposed on the symmetry plane for macroscale modeling; (b) unit cell (UC) for microscale modeling.

Fig. 2 Effects of welding speed on temperature fields (a), peak temperature (b) and accumulated plastic strain along the ‘transversal line’ defined in Fig. 1(a) (c).

Fig. 3 Measured and predicted thermal cycles at location P2 for V50 (a) and V150 (b). The previous model in (a) means the multiscale model in the Ref. [14]. The line ABˉ denotes the preservation time td when the temperature is above 250?°C. The measured temperature of V150?in.(b) is from our previous work [14].

Fig. 4 Profiles of L (a), T (b) and N (c) macroscopic RSes cross welds at middle thickness and middle weld length for V50, V100 and V150. The experimental results of V150 are from our previous work [14].

Fig. 5 Effects of welding speed on L macroscopic RS fields.

Fig. 6 Profiles of L, T and N elastic mismatch RSes cross welds at middle thickness and middle weld length for V50, V100 and V150: (a) L, (c) T and (e) N components in 2009Al matrix; (b) L, (d) T and (f) N components in reinforcement. The experimental results of V150 are from our previous work [14].

Fig. 7 Longitudinal elastic mismatch RS fields of matrix and reinforcement at macro-micro point P0 for V50 (a, c) and V150 (b, d).

Fig. 8 Comparison of profiles of thermal misfit residual stress cross welds at middle thickness and middle weld length for V50, V100 and V150: (a) in 2009Al matrix; (b) in reinforcement. The experimental results of V150 are from our previous work [14].

Fig. 9 Longitudinal thermal plus plastic misfit RS fields of matrix and reinforcement at macro-micro point P0 for V50 (a, c) and V150 (b, d).

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

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