Microstructure and Mechanical Properties of Friction Stir Repaired Al–Cu Casting Alloy

Microstructure and Mechanical Properties of Friction Stir Repaired Al–Cu Casting Alloy Friction stir repairing was successfully used to repair shrinkage cavity and porosity defects in Al–Cu casting alloy plates with T5 treatment. Effects of welding speeds on microstructures and mechanical properties of repaired region were mainly discussed. The results show that heat affected zone has the minimum microhardness due to coarser grains, where the tensile fracture is located. Through the thickness of the stir zone (SZ), the grain size decreases with increasing distance from the top surface of the repaired region due to the difference of heat input and cooling rate. The tensile strength and elongation of the SZ characterized by finer grains are both higher than those of the repaired region. These values of the SZ at 900 rpm and 150 mm/min reach 336.8 MPa and 11.75%, equivalent to 90.7 and 81.6% of BM without casting defects, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Transactions of the Indian Institute of Metals Springer Journals

Microstructure and Mechanical Properties of Friction Stir Repaired Al–Cu Casting Alloy

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Publisher
Springer India
Copyright
Copyright © 2018 by The Indian Institute of Metals - IIM
Subject
Materials Science; Metallic Materials; Materials Science, general; Tribology, Corrosion and Coatings
ISSN
0972-2815
eISSN
0975-1645
D.O.I.
10.1007/s12666-018-1340-x
Publisher site
See Article on Publisher Site

Abstract

Friction stir repairing was successfully used to repair shrinkage cavity and porosity defects in Al–Cu casting alloy plates with T5 treatment. Effects of welding speeds on microstructures and mechanical properties of repaired region were mainly discussed. The results show that heat affected zone has the minimum microhardness due to coarser grains, where the tensile fracture is located. Through the thickness of the stir zone (SZ), the grain size decreases with increasing distance from the top surface of the repaired region due to the difference of heat input and cooling rate. The tensile strength and elongation of the SZ characterized by finer grains are both higher than those of the repaired region. These values of the SZ at 900 rpm and 150 mm/min reach 336.8 MPa and 11.75%, equivalent to 90.7 and 81.6% of BM without casting defects, respectively.

Journal

Transactions of the Indian Institute of MetalsSpringer Journals

Published: Jun 2, 2018

References

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