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Effects of Heat Input on Microstructure and Mechanical Properties of Dissimilar Laser-Welded Dual-Phase and Boron Steel Joints
- Isiaka Akanbi Aderibigbe - Tshwane University of Technology, Department of Chemical, Metallurgical and Materials Engineering, South Africa ,
- Patricia Abimbola Popoola - Tshwane University of Technology, Department of Chemical, Metallurgical and Materials Engineering, South Africa ,
- Rotimi Emmanuel Sadiku - Tshwane University of Technology, Department of Polymer Technology, South Africa ,
- Elliot Biro - University of Waterloo, Department of Mechanical and Mechatronic Engineering, Canada
Journal Article
05-15-01-0005
ISSN: 1946-3979, e-ISSN: 1946-3987
Sector:
Topic:
Citation:
Aderibigbe, I., Popoola, P., Sadiku, R., and Biro, E., "Effects of Heat Input on Microstructure and Mechanical Properties of Dissimilar Laser-Welded Dual-Phase and Boron Steel Joints," SAE Int. J. Mater. Manf. 15(1):51-70, 2022, https://doi.org/10.4271/05-15-01-0005.
Language:
English
Abstract:
Heat-affected zone (HAZ) softening occurs during the laser welding of many
Advanced High-Strength Steels (AHSS) that are used for body-in-white (BIW) of
automobiles, leading to degradation in the mechanical properties of the welded
joints. The microstructure and mechanical properties of dissimilar laser-welded
AHSS comprising of as-received 22MnB5 with dual-phase (DP) steels (DP600, DP800,
and DP 1000) were investigated in this study. Welds were made at welding speeds
ranging from 1 m/min to 3 m/min. Irrespective of welding speed, the DP600-22MnB5
joints fractured in the base metal (BM) of 22MnB5 during tensile tests.
Likewise, welded joints of DP800-22MnB5 and DP1000-22MnB5 made at 1 m/min and 2
m/min failed in the BM; however, at 3 m/min the failure location of these joints
shifted to the fusion zone (FZ). The fractured surfaces of all the welded
combinations were characterized by optical and scanning electron microscopy
(SEM). Based on fracture energy, joints welded at 2 m/min were optimal due to a
compromise of minimizing the weld size and formation of hard phases within the
weld FZ and HAZ.