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- Title
Microstructure and mechanical property improvement of dissimilar metal joints for TC4 Ti alloy to 301L stainless steel.
- Authors
Zhang, Yan; Sun, DaQian; Gu, XiaoYan; Li, HongMei
- Abstract
Pulsed laser welding of Ti alloy to stainless steel (SS) has been applied using pure V as an interlayer. Microstructures and mechanical properties of joints were improved by changing laser offset. Two-pass welding was applied, and two weld zones were produced in the joint. The unmelted V interlayer acted as a barrier to mixing of the two base materials during welding. The melting amount of base materials and V interlayer was controlled by changing laser offset to control the fusion ratio and thus to improve joint microstructure. σ-Phase was present in V-SS weld zone of joint with laser offset of zero, which resulted in failure of the joint. Through changing laser offset, V concentration in V-SS weld zone of SS-0.2 mm offset joint was decreased and σ-phase was eliminated in the joint. ω-Phase was discovered in Ti alloy-V weld zone of zero-offset joint, which had an adverse effect on mechanical property of the joint. Through changing laser offset, V concentration in Ti alloy-V weld zone of V-0.2 mm offset joint was increased and precipitation of ω-phase was prevented. Three joints (zero-offset joint, SS-0.2 mm offset joint and V-0.2 mm offset joint) exhibited the tensile strength of 504, 548 and 599 MPa, respectively.
- Subjects
PULSED lasers; LASER welding; TITANIUM alloys; STAINLESS steel; MICROSTRUCTURE; PRECIPITATION (Chemistry); TENSILE strength
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 4, p2942
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-017-1708-z