Abstract

A preliminary study of deformation behavior of friction stir welded (FSW) Ti-6Al-4V was performed using two different tools with cylindrical and stepped spiral pin design for the welding process. The nugget regions experienced temperature above β transus and the matrix transformed to fine acicular α during cooling of the nugget. By using stepped spiral pin design, a local region with much refined grain structure and significant tool debris particles were observed. Room temperature tensile test showed increased strength and decreased ductility in the material from this region. Fractographic analysis revealed that tool debris particles served as void nucleation sites. Tensile tests of FSW material were carried out at 625 °C in the strain rates of 3 x 10-4 and 1 x 10-3 s-1. The strength was higher as compared to the as-received material. Microstructural evolution during tensile test was also investigated. Results showed that dynamic globularization occurred during the high temperature tensile test. © 2014 ASM International.

Department(s)

Materials Science and Engineering

Comments

Boeing, Grant None

Keywords and Phrases

Friction stir welding; Mechanical properties; Titanium

International Standard Serial Number (ISSN)

1544-1024; 1059-9495

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Springer; ASM International, All rights reserved.

Publication Date

01 Jan 2014

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Metallurgy Commons

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