Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 558, Issue -, Pages 586-591Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.08.056
Keywords
Friction stir welding; Aluminum alloy; Formability; Post weld heat treatment
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Funding
- National Natural Science Foundation of China [51175111]
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Subsequent spinning combined with post weld heat treatment (PWHT) was imposed to the friction-stir welding tube, and the effects of PWHT on the formability and microstructural stability of the FSW tubes were investigated in detail. The formability of tubes, evaluated by the hydraulic bulge test, is significantly improved after spinning and PWHT due to the grain refinement, removal of the thickness reduction and heterogeneous microstructure of the weld. Even abnormal grain growth occurs, the tubes still show a relatively high formability compared to the extruded tubes. The PWHT process plays key roles in controlling the size of precipitates and subgrains, and consequently dominates the microstructure stability that is correlated to the strain hardenability and formability of the tubes. (C) 2012 Elsevier B.V. All rights reserved.
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