The effect of heat treatment on mechanical properties of pulsed Nd:YAG welded thin Ti6Al4V

Abstract

Pulsed Nd:YAG has been adopted successfully in welding process of thin (0.7 mm) Ti6Al4V. Laser welding of such thin sheet requires a small focal spot, good laser beam quality and fast travel speed, since too much heat generation can cause distortion for thin sheet weld. The microstructures of Ti6Al4V were complex and strongly affected the mechanical properties. These structures include: a´ martensite, metastable ß, Widmanstätten, bimodal, lamellar and equiaxed microstructure. Bimodal and Widmanstätten structures exhibit a good-balance between strength and ductility. The microstructure of pulsed Nd:YAG welded Ti6Al4V was primarily a´ martensite, which showed the lowest ductility but not significantly high strength. A heat treatment at 950 followed by furnace cooling can transform the microstructure in the weld from a´ martensite structure into Widmanstätten structure.

Publication DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.3672
Divisions: Engineering & Applied Sciences > Mechanical Engineering & Design
Engineering & Applied Sciences > Engineering Systems & Management
Engineering & Applied Sciences
Engineering & Applied Sciences > Sustainable environment research group
Uncontrolled Keywords: heat treatment,pulsed Nd,YAG laser welding,thin,Ti6-Al-4V
Full Text Link: http://www.scie ... MR.189-193.3672
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2011
Authors: Fan, Yu
Shipway, Philip H
Tansley, Geoff D.
Xu, Jie

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