研究目的
To study the inductive heating of a DP980 steel sheet during laser welding in terms of microstructural evolution and hardness.
研究成果
High-temperature laser welding of DP980 steel results in a microstructure composed of grain boundary and bainitic ferrite and austenite, with a flatter hardness profile and reduced residual stresses and bending compared to room temperature welding. This method could be beneficial for thermomechanical processing and use in safety components.
研究不足
The study focuses on DP980 steel and may not be directly applicable to other steel grades. The high-temperature procedure requires precise control of temperature and cooling rates, which could be challenging in industrial settings.
1：Experimental Design and Method Selection:
The study involved laser welding of DP980 steel sheets at both room temperature and high temperature (526 °C) to observe microstructural and hardness changes. The high-temperature procedure used inductive heating to reduce cooling rates and promote bainite formation instead of martensite.
2：Sample Selection and Data Sources:
1-mm thick dual phase class DP980 sheets were used, with chemical composition provided by ArcelorMittal.
3：List of Experimental Equipment and Materials:
A fiber laser (IPG, model YLR-2000), induction furnace, pyrometer Metis MP25, optical microscopy (Zeiss, model Imager2M), scanning electron microscopy (Hitachi, model TM-3000), and Vickers hardness tester (FutureTech FM-800) were used.
4：Experimental Procedures and Operational Workflow:
Sheets were butt-welded using the fiber laser with specific parameters for full penetration. Temperature profiles were recorded, and microstructural analysis was conducted post-welding.
5：Data Analysis Methods:
Microstructural features were analyzed using optical and scanning electron microscopy. Hardness was measured using Vickers hardness tests. Residual stresses and bending were estimated using finite element software (SysWeld, ESI-Group).
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optical microscopy
Imager2M
Zeiss
Used for microstructural analysis of the welded samples.
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scanning electron microscopy
TM-3000
Hitachi
Used for detailed microstructural analysis of the welded samples.
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fiber laser
YLR-2000
IPG
Used for laser welding of DP980 steel sheets.
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pyrometer
Metis MP25
Used to record temperature in the middle of the fusion zone.
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Vickers hardness tester
FM-800
FutureTech
Used to measure hardness of the welded samples.
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