研究目的
Investigating the mechanical properties of weld zones in laser-welded dissimilar dual-phase steels and their effects on formability.
研究成果
The study successfully measured the weld zone properties of laser-welded dissimilar dual-phase steels and demonstrated their significant effects on formability. The finite element simulations considering the weld zone properties showed better agreements with experiments than those without the weld zone properties.
研究不足
The small size of the weld zones makes it difficult to measure their properties precisely. The study assumes isotropic von Mises yield function in the fusion zone and uses the r-values of the base materials for the heat affected zones, which may not fully capture the anisotropy of the weld zones.
1：Experimental Design and Method Selection:
The study involved measuring flow stresses of weld zones in laser-welded dissimilar dual-phase steels using the digital image correlation method.
2：Sample Selection and Data Sources:
Two different grades of advanced high strength steels – dual phase steel sheets with a tensile strength of 980 MPa (DP980, thickness
3：6 mm) and 590 MPa (DP590, thickness 2 mm) – were studied. List of Experimental Equipment and Materials:
A universal testing machine for uniaxial tensile tests, laser welding equipment, and digital image correlation system for strain measurement.
4：Experimental Procedures and Operational Workflow:
Tensile tests with miniature notched specimens were carried out to measure strains at the weld zones. The digital image correlation method was used to measure deformation in the weld zones.
5：Data Analysis Methods:
The Hill 1948 yield criterion was used to convert the stress-strain data of the notched specimen to the effective stress-equivalent plastic strain data.
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