Impact of Plate Thickness on Laser-Welded 22MnB5 Steel
Author Information
Author(s): Sang Kaixuan, Li Xin, Zhang Yu, Yi Lingling, Chen Jing, Lu Yuting, Gu Zhengwei
Primary Institution: Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun, China
Hypothesis
How does the thickness of 22MnB5 hot-forming steel plates affect their laser-welded microstructure and mechanical properties?
Conclusion
As the plate thickness of 22MnB5 hot-forming steel increases, the tensile strength and hardness of the welded joints decrease due to larger martensite grain sizes and reduced dislocation density.
Supporting Evidence
- The tensile strength of welded joints decreased from 1489 MPa to 1357 MPa and 1275 MPa as plate thickness increased.
- The heat-affected zone exhibited the lowest mechanical properties.
- Microstructural changes in the heat-affected zone were more pronounced than those in the fusion zone.
- Laser-welded joints of three thicknesses can exceed 85% of the corresponding base metal strength.
Takeaway
This study shows that thicker steel plates are weaker when welded because the grains inside them get bigger, making them less strong.
Methodology
The study involved laser welding of 22MnB5 steel plates of varying thicknesses (2 mm, 3 mm, and 4 mm) and analyzing their mechanical properties and microstructure.
Limitations
The study primarily focuses on three specific thicknesses and may not cover all possible variations in welding parameters.
Digital Object Identifier (DOI)
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