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RESEARCH PAPERS

Material Flow in FSW of AA7075-T6 Butt Joints: Continuous Dynamic Recrystallization Phenomena

[+] Author and Article Information
L. Fratini1

Dipartimento di Tecnologia Meccanica, Produzione e Ingegneria Gestionale,  Università di Palermo, Viale delle Scienze, 90128 Palermo, Italyabaqus@dtpm.unipa.it

G. Buffa

Dipartimento di Tecnologia Meccanica, Produzione e Ingegneria Gestionale,  Università di Palermo, Viale delle Scienze, 90128 Palermo, Italyg.buffa@dtpm.unipa.it

D. Palmeri

Dipartimento di Tecnologia Meccanica, Produzione e Ingegneria Gestionale,  Università di Palermo, Viale delle Scienze, 90128 Palermo, Italypalmeri@dtpm.unipa.it

J. Hua

Department of Industrial Welding and Systems Engineering,  The Ohio State University, 1971 Neil Avenue, 210 Baker Systems, Columbus, OH 43210hua.14@osu.edu

R. Shivpuri

Department of Industrial Welding and Systems Engineering,  The Ohio State University, 1971 Neil Avenue, 210 Baker Systems, Columbus, OH 43210shivpuri.1@osu.edu

1

Corresponding author.

J. Eng. Mater. Technol 128(3), 428-435 (Feb 23, 2006) (8 pages) doi:10.1115/1.2204946 History: Received August 30, 2005; Revised February 23, 2006

In the paper the continuous dynamic recrystallization (CDRX) phenomena occurring in the FSW of AA7075-T6 butt joints is investigated at the varying of the most relevant technological and geometrical parameters. In particular, both experiments and numerical simulations obtained utilizing a 3D Lagrangian implicit, coupled, rigid-viscoplastic model have been developed on FSW butt joints. The resulting microstructure at the core of the weldings is correlated to the material flow occurring during the FSW process.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Sketch of the FWS butt joint

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Figure 2

Material microstructures in a typical joint section (AA7075-T6)

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Figure 4

Heat affected zone (HAZ)

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Figure 5

Thermomechanically affected zone (TMAZ)

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Figure 7

The swirl phenomena

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Figure 8

The FE continuum model at the beginning of the simulation

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Figure 9

Top view of the specimens to be welded with the positioned marker

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Figure 10

T1-J1 transverse section (R=1500r.p.m.; Vf=105mm∕min): the overall material flow

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Figure 11

T1-J1 horizontal section (R=1500r.p.m.; Vf=105mm∕min)

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Figure 12

T1-J3 horizontal section (R=1040r.p.m.; Vf=105mm∕min)

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Figure 13

T1-J6 horizontal section (R=715r.p.m.; Vf=214mm∕min)

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Figure 14

Nodes traces in the FEM model: (a) T1-J1, (b) T1-J6

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Figure 15

T1-J1 grain size distribution in the transverse section (μm)

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Figure 16

Nugget grain morphology: (a) T1-J1, (b) T1-J4, (c) T1-J6 (50×)

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Figure 17

T3-J4 transverse section (R=104r.p.m.; Vf=141mm∕min)

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Figure 18

T3-J3 horizontal section (R=1040r.p.m.; Vf=105mm∕min): (a) experiment, (b) FEM model

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Figure 19

Nugget grain morphology: (a) T2-J1, (b) T2-J4, (c) T2-J6 (50×)

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Figure 20

T2-J3 grain size distribution in the transverse section (μm)

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Figure 21

Flow pattern pitch versus RP

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Figure 22

Average nugget grain size versus RP. Comparison between numerical prediction and experiments.

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