Effects of Laser Forming on the Mechanical Properties and Microstructure of DP980 Steel

Dong, Wenbin; Bao, Le; Li, Wenqi; Shin, Kyung-Hoon; Han, Changsoo

doi:10.3390/ma15217581

Cited by 3 publications

(1 citation statement)

References 12 publications

(12 reference statements)

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“…For the forming process of high-strength-steel body panel, Guo et al [ 7 ] optimized the process parameters in the drawing process. Dong et al [ 8 ] conducted experiments to research the mechanical properties of DP980 steel plate laser forming under different laser parameters. Through the underwater welding test of high-strength steel, Fydrych et al [ 9 ] proved that steel S355J2G3 and S500M are easy to crack under wet welding conditions and proposed a tempering bead technique to improve the wet weldability.…”

Section: Introductionmentioning

confidence: 99%

Numerical Calculation of High-Strength-Steel Saddle Plate Forming Suitable for Lightweight Construction of Ships

Wang

Dai

et al. 2023

Materials

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With the demand for construction of lightweight ships and polar ships, high-strength steel is increasingly applied in shipbuilding. There are a large number of complex curved plates to be processed in ship construction. The main method for forming a complex curved plate is line heating. A saddle plate is an important type of double-curved plate, which affects the resistance performance of the ship. The existing research on high-strength-steel saddle plates is lacking. To solve the problem of forming for high-strength-steel saddle plates, the numerical calculation of line heating for a EH36 steel saddle plate was studied. By combining it with a line heating experiment of low-carbon-steel saddle plates, the feasibility of numerical calculation based on the thermal elastic–plastic theory for high-strength-steel saddle plates was verified. Under the premise that the processing conditions such as the material parameters, heat transfer parameters, and the constraint mode of the plate were correctly designed, the effects of the influencing factors on deformation of the saddle plate could be studied by the numerical calculation method. The numerical calculation model of line heating for high-strength-steel saddle plates was established, and the effects of geometric parameters and forming parameters on shrinkage and deflection were studied. This research can provide ideas for the lightweight construction of ships and provide data support for automatic processing of curved plates. It can also provide inspiration for curved plate forming in fields such as aerospace manufacturing, the automotive industry, and architecture.

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Section: Introductionmentioning

confidence: 99%

Numerical Calculation of High-Strength-Steel Saddle Plate Forming Suitable for Lightweight Construction of Ships

Wang

Dai

et al. 2023

Materials

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Numerical calculation of overlapping line heating for marine titanium alloy curved plate

Wang,

et al. 2024

Ocean Engineering

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Effects of Laser Scanning Strategy on Bending Behavior and Microstructure of DP980 Steel

Dong,

Zhang,

Bao

et al. 2024

Materials

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Laser bending is a kind of cumulative forming technology and bending efficiency is one of its most important indexes. This study investigates the bending behavior and the microstructure of DP980 steel plates under different laser scanning strategies, using an IPG laser system. Two sets of experiments varied the accumulated line energy density (AED) by altering the laser scanning velocity and number of scans. The results show that, for the single laser scanning process, the bending angle of the plate increases with AED, due to a larger temperature gradient through the thickness direction; however, this relationship is nonlinear. A higher AED led to a sharper initial increase in bending angle, which then plateaued. Under the same AED conditions, the bending angle of the plate undergoing multiple laser scans increases by at least 26% compared to the single one, due to the microstructure changes. It is revealed that the bending efficiency is affected by both the AED and the resultant microstructure evolution in the DP980 steel. Higher AED values and appropriate peak temperatures facilitate better bending behavior due to the formation of uniform martensite and grain refinement. Conversely, excessive peak temperatures can hinder bending due to grain growth.

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Effects of Laser Forming on the Mechanical Properties and Microstructure of DP980 Steel

Cited by 3 publications

References 12 publications

Numerical Calculation of High-Strength-Steel Saddle Plate Forming Suitable for Lightweight Construction of Ships

Numerical Calculation of High-Strength-Steel Saddle Plate Forming Suitable for Lightweight Construction of Ships

Numerical calculation of overlapping line heating for marine titanium alloy curved plate

Effects of Laser Scanning Strategy on Bending Behavior and Microstructure of DP980 Steel

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