High-strength titanium alloy/steel butt joint produced via friction stir welding

[Display omitted] •Ti/steel friction stir welded butt-joints are first reported to be produced with defect-free.•The welds are of higher tensile strength than that of steel base material.•A continuous FeTi layer with an average thickness of ∼3 μm is observed.•Decreasing rotation speed helps in reduc...

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Bibliographic Details
Published in:Materials letters 2019-01, Vol.234, p.155-158
Main Authors: Li, Shuhan, Chen, Yuhua, Zhou, Xingwen, Kang, Jidong, Huang, Yongde, Deng, Huaibo
Format: Article
Language:English
Subjects:
Butt joints
Butt welding
Friction stir welding
High strength alloys
Intermetallic compound
Intermetallic compounds
Materials science
Microhardness
Microstructure
Rotation
Steel
Titanium alloy
Titanium alloys
Titanium base alloys
Welded joints
Welding
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Summary:[Display omitted] •Ti/steel friction stir welded butt-joints are first reported to be produced with defect-free.•The welds are of higher tensile strength than that of steel base material.•A continuous FeTi layer with an average thickness of ∼3 μm is observed.•Decreasing rotation speed helps in reducing intermetallic compound thickness and grain size. For the first time, defect-free butt welds of titanium alloy/steel were successfully fabricated via friction stir welding. Joints were produced by employing rotation speed varied at 600 and 950 rpm with a constant travel speed of 47.5 mm/min. An increasing of rotation speed leads to thicken the intermetallic compound layer, coarsen the grain size and thus decrease the joint microhardness. Thanks to the solid-state joining process, only a thin FeTi layer was formed at the interface even rotation speed increased to 950 rpm. As a result, all obtained joints fractured at the base steel material. The work carried out clearly shows the good weldability of titanium alloy to steel via friction stir welding.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.09.094