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Microstructural characteristics and mechanical properties of friction stir welded joints of Ti–6Al–4V titanium alloy

Liu, H.J. / Zhou, L. / Liu, Q.W.

AbstractThe α+β titanium alloy, Ti–6Al–4V, was friction stir welded at a constant tool rotation speed of 400rpm. Defect-free welds were successfully obtained with welding speeds ranging from 25 to 100mm/min. The base material was mill annealed with an initial microstructure composed of elongated primary α and transformed β. A bimodal microstructure was developed in the stir zone during friction stir welding, while microstructure in the heat affected zone was almost not changed compared with that in the base material. An increase in welding speed increased the size of primary α in the stir zone. The weld exhibited lower hardness than the base material and the lowest hardness was found in the stir zone. Results of transverse tensile test indicated that all the joints had lower strength and elongation than the base material, and all the joints were fractured in the stir zone.

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Microstructural characteristics and mechanical properties of friction stir welded joints of Ti–6Al–4V titanium alloy

Liu, H.J. / Zhou, L. / Liu, Q.W.

AbstractThe α+β titanium alloy, Ti–6Al–4V, was friction stir welded at a constant tool rotation speed of 400rpm. Defect-free welds were successfully obtained with welding speeds ranging from 25 to 100mm/min. The base material was mill annealed with an initial microstructure composed of elongated primary α and transformed β. A bimodal microstructure was developed in the stir zone during friction stir welding, while microstructure in the heat affected zone was almost not changed compared with that in the base material. An increase in welding speed increased the size of primary α in the stir zone. The weld exhibited lower hardness than the base material and the lowest hardness was found in the stir zone. Results of transverse tensile test indicated that all the joints had lower strength and elongation than the base material, and all the joints were fractured in the stir zone.

Microstructural characteristics and mechanical properties of friction stir welded joints of Ti–6Al–4V titanium alloy

Liu, H.J. / Zhou, L. / Liu, Q.W.

AbstractThe α+β titanium alloy, Ti–6Al–4V, was friction stir welded at a constant tool rotation speed of 400rpm. Defect-free welds were successfully obtained with welding speeds ranging from 25 to 100mm/min. The base material was mill annealed with an initial microstructure composed of elongated primary α and transformed β. A bimodal microstructure was developed in the stir zone during friction stir welding, while microstructure in the heat affected zone was almost not changed compared with that in the base material. An increase in welding speed increased the size of primary α in the stir zone. The weld exhibited lower hardness than the base material and the lowest hardness was found in the stir zone. Results of transverse tensile test indicated that all the joints had lower strength and elongation than the base material, and all the joints were fractured in the stir zone.

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Title:

Microstructural characteristics and mechanical properties of friction stir welded joints of Ti–6Al–4V titanium alloy

Contributors:

Liu, H.J. (author) / Zhou, L. (author) / Liu, Q.W. (author)

Publication date:

2009-08-15

Size:

6 pages

ISSN:

DOI:

https://doi.org/10.1016/j.matdes.2009.08.025

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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