研究目的
To investigate the effect of laser forming on the mechanical properties of multiple-phase steels by developing a temperature-controlled thermal–microstructure–mechanical model and simulating deformation and phase transformation.
研究成果
The developed model accurately predicts deformation and mechanical properties changes in dual-phase steel due to laser forming. Bending angle and tensile strength increase with the number of scanning lines due to ferrite-to-martensite phase transformation. Experimental results confirm simulations, showing improved material strength.
研究不足
The model assumes no creep and uses von Mises yield function; material parameters are temperature-dependent but may not cover all conditions. Experimental validation is limited to DP590 steel and specific laser parameters.
1：Experimental Design and Method Selection:
A temperature-controlled thermal–microstructure–mechanical model was developed based on a forming temperature-controlled mixed strain-hardening law. It includes elastic and elastic–plastic constitutive models, a phase-transformation model, and a mixed strain-hardening law. The model was implemented in Abaqus/UMAT for finite element simulation.
2：Sample Selection and Data Sources:
3：8-mm-thick DP590 steel sheet was used. Specimens were designed based on ISO 6892-
2016 standard for static tensile tests.
4：List of Experimental Equipment and Materials:
CO2 laser with HJ-3000 laser processing system (includes laser head, cooling system, laser power supply, optical system, host, numerical control system). Graphite with adhesive and diluents was applied to improve heat dissipation.
5：Experimental Procedures and Operational Workflow:
Laser scanning was performed perpendicular to the specimen length with one end fixed and the other free. Parameters: absorption coefficient 0.50, laser power density 0.08 W·cm?3, beam diameter 0.001 m, density 7830 kg·m?3, laser speed 0.25 mm·s?1, specific heat capacity -1.66×10?3 kJ·kg?1·K, heat conductivity coefficient -3.67×10?? kW·m?1·K. Heating and cooling rates were approximately ±0.021 K·s?1.
6：50, laser power density 08 W·cm?3, beam diameter 001 m, density 7830 kg·m?3, laser speed 25 mm·s?1, specific heat capacity -66×10?3 kJ·kg?1·K, heat conductivity coefficient -67×10?? kW·m?1·K. Heating and cooling rates were approximately ±021 K·s?1.
Data Analysis Methods:
5. Data Analysis Methods: Simulation results for bending angle, phase transformation, and stress-strain relationships were compared with experimental data. Statistical averaging was used for bending angles from multiple specimens.
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