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Laser-implanted short fiber-like interface structure for strengthening welded-brazed joint of Al/steel dissimilar metals
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DOI：10.1016/j.jmst.2025.01.069.png)
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Abstract
En 中文
The lamellar layer of intermetallic compounds (IMCs) was adversely affected the performance of weldingbrazing joints in Al/steel dissimilar metals. In this study, a short fiber-like surface morphology was fabricated on the butt surface of Q235 steel via laser. The interaction behavior between the short fibers and the molten pool was captured using a high-speed camera. Laser-arc hybrid welding-brazing was then employed to join Al (6061-T6) to the steel. This process successfully created a short fiber-like interface structure at the joint. The relationship between microstructure and mechanical properties was investigated, compared with Al/bare steel (ABS) joint. The research results indicated that the IMCs layer consisted of FeAl3 and Fe2 Al5 . The interface strength of the Al/short fiber-like surface structural steel (ASFSSS) joint reached 153.2 MPa, an 82.2 % increase compared to the ABS joint, which reached 84.1 MPa. When the ASFSSS joints without the reinforcement were bent to 58.2 degrees and 25.2 degrees in the longitudinal and transverse direction, respectively, they remained intact. However, cracks were discovered when the bending angle of the ABS reached 39.1 degrees and 0 degrees in the two directions. Numerical simulation revealed that the short fiberlike interface structure significantly reduced residual stress and improved the stress distribution in the weld, thereby enhancing the strength and toughness of Al/steel dissimilar joints. The crack propagation path in the ASFSSS joint was deflected into the weld when it encountered short fibers, and the fracture morphology presented the characteristic of ductile-brittle mixed fracture. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keywords:
Short fiber-like interface structure
Laser-arc welding-brazing
Al/steel dissimilar joint
Intermetallic compounds
Mechanical properties
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14.3
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6.1W
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