Pulsed laser welding of Ti-6Al-4V titanium alloy to AISI 316L stainless steel using Cu/Nb bilayer

•A composite interlayer which is designed by combining metallurgical compatibility has been proposed.•The use of Cu/Nb bilayer can inhibit the formation of massive Fe-Ti intermetallic compounds.•The insertion of Cu/Nb bilayer contributes to the production of solid solution.•By regulating the welding...

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Bibliographic Details
Published in:Materials letters 2019-06, Vol.244, p.163-166
Main Authors: Fang, Yongjian, Jiang, Xiaosong, Song, Tingfeng, Mo, Defeng, Luo, Zhiping
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Copper
Cracks
Interlayer
Laser beam welding
Laser processing
Lasers
Materials science
Microstructure
Niobium
Pulsed lasers
Solid solutions
Stainless steel
Titanium alloy
Titanium alloys
Titanium base alloys
Welded joints
Welding
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Summary:•A composite interlayer which is designed by combining metallurgical compatibility has been proposed.•The use of Cu/Nb bilayer can inhibit the formation of massive Fe-Ti intermetallic compounds.•The insertion of Cu/Nb bilayer contributes to the production of solid solution.•By regulating the welding parameters, the quality of laser-welded joints with a Cu/Nb bilayer can be improved. Laser welding of TC4 titanium alloy and AISI 316L stainless steel was performed by inserting Cu/Nb bilayer. If high laser power was employed, microstructure of fusion zone of titanium alloy side was mainly composed of (Nb,Ti) solid solution, and Ti-Cu phases would be produced near fusion zone between Cu and Nb. If relatively low laser power was applied, the formation of cracks could be slightly inhibited, and microstructure in fusion zone between Cu and Nb was replaced by (Cu,Nb) solid solution. Owing to the formation of cracks, maximum tensile strength of weld joints was only 114  MPa.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.02.075