Joining of CP-Ti to 304 stainless steel using friction stir welding technique

Friction stir welding parameters were adjusted in order to achieve defect-free dissimilar lap joint of CP-Ti to 304 stainless steel. Titanium as a softer material was selected to be on the lap top side. The joint stir zone was found to be consisted of two main regions; the dominant fine dynamically...

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Bibliographic Details
Published in:Materials in engineering 2010-12, Vol.31 (10), p.4800-4807
Main Authors: Fazel-Najafabadi, M., Kashani-Bozorg, S.F., Zarei-Hanzaki, A.
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Crystal structure
Failure
Fracture mechanics
Friction stir welding
Grains
Materials selection
Mechanical
Microstructure
Stainless steels
Titanium
Welding
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Summary:Friction stir welding parameters were adjusted in order to achieve defect-free dissimilar lap joint of CP-Ti to 304 stainless steel. Titanium as a softer material was selected to be on the lap top side. The joint stir zone was found to be consisted of two main regions; the dominant fine dynamically re-crystallized titanium grains at the upper region and a minor composite-type microstructure of fragments of 304 stainless steel in a matrix of fine dynamically re-crystallized titanium grains in the lower region. The stir zone was separated from the 304 stainless steel side by an interface layer of TiFe-based crystal structure. Joint shear strength was measured; a maximum failure load of ∼73% of that of CP-Ti was achieved. This was associated with the occurrence of fracture at the joint intermetallic-based interface. The failure load value of the fabricated joints is related to the thickness of the intermetallic interface.
ISSN:0261-3069
DOI:10.1016/j.matdes.2010.05.003