研究目的
Investigating the influence of heat input on microstructural variation, microhardness and tensile properties of laser welded dual phase steels.
研究成果
The study concluded that beam power and traverse speed significantly affect the weld penetration, microstructure, and hardness of DP 590 steel. Higher beam powers and lower traverse speeds resulted in complete weld penetration and increased hardness due to martensite formation. The width of the HAZ and WZ decreased with increased traverse speed.
研究不足
The study was limited to specific beam powers and traverse speeds, and the effects were observed on a single thickness of DP 590 steel. Further optimization and testing on different materials and thicknesses could be explored.
1：Experimental Design and Method Selection:
The study used Nd: YAG fibre laser source at varying beam powers and traverse speeds to investigate the effects on DP 590 steel.
2：Sample Selection and Data Sources:
DP 600 plate of 100 X 120 X
3：6 mm was used. Chemical composition and mechanical properties were determined using standard methods. List of Experimental Equipment and Materials:
Neodymium-Ytterbium doper fibre lasers (ARNOLD Make), Baird Optical Emission Spectrometer (DV-6), Instron 5500R - 4507 - 200kN, Olympus BX51M, MATSUZAWA MMT X7 microhardness tester.
4：Experimental Procedures and Operational Workflow:
Weld beads were produced in keyhole mode with varying parameters. Microstructural studies and hardness measurements were conducted on transverse sections.
5：Data Analysis Methods:
Optical microscopy and microhardness testing were used to analyze the effects of welding parameters on microstructure and hardness.
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