Abstract
The influence of magnetic treatment on the yield strength, the ultimate tensile strength and the elongation of laser tailor welded blanks (TWBs) of DP600 steel was investigated by uniaxial tensile tests. The experimental results showed that the yield strength and the ultimate tensile strength of the TWBs had only a slight change, but the elongation increased by 13.90%–36.23% after the magnetic treatment. The dislocation distributions in the fusion zone (FZ) and the heat-affected zone (HAZ) were observed respectively by transmission electron microscopy (TEM). It was found that after magnetic treatment, the dislocations in both the FZ and the HAZ of the TWBs increased and showed a relatively uniform distribution. The mechanism of the mechanical property improvement of the TWBs by the magnetic treatment was then revealed on the basis of the relationship model between the dislocation and shear strain, considering the evolution of magnetic domains and Frank-Read dislocation multiplication in a magnetic field.
Highlights
Tailor welded blanks (TWBs) are made up of several steels with different materials, thicknesses and/or coatings to meet the diverse requirements of the components on the properties and thickness of the material [1]
Researched the tensile properties of laser tailor welded blanks (TWBs) of DP600 steel and the results showed that the hardness increased significantly in the fusion zone (FZ), the yield strength increased and the ultimate tensile strength remained almost unchanged after welding
Kang [10] investigated the mechanical properties and formability of laser-welded 600 MPa grade TRIP (Transformation Induced Plasticity) steel and DP (Dual Phase) steel and the results showed that the FZ hardness increased, the yield strength and ultimate tensile strength increased, but the elongation and the formability decreased
Summary
Tailor welded blanks (TWBs) are made up of several steels with different materials, thicknesses and/or coatings to meet the diverse requirements of the components on the properties and thickness of the material [1]. Researched the tensile properties of laser TWBs of DP600 steel and the results showed that the hardness increased significantly in the FZ, the yield strength increased and the ultimate tensile strength remained almost unchanged after welding. Zhao [12] detected the micro-hardness of high-speed steel for cutting tools under a pulsed magnetic field, and found that magnetic treatment with appropriate. When the magnetic magnetic field treatment and the results showed that the welding residual stress was reduced by up was oriented along the blank thickness. Besides the aforementioned welding residual caused by are magnetic changes in the microstructures and properties of TWBs stress under relief a magnetic field still nottreatment, clear. Mechanism is explained with the combination effect of the magnetic domain and dislocation
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