研究目的
Comparative study on microstructure and aluminum distribution between laser beam welding and electron beam welding of Ti–6Al–4V alloy plates.
研究成果
The study concludes that EBW and LBW processes result in different microstructures and aluminum distributions in Ti–6Al–4V alloy joints, with EBW joints showing more significant aluminum burning loss and coarser acicular martensite α′. The characteristics of convection and thermal field within the molten pool are recognized as vital factors influencing the aluminum distribution. The lower microhardness profile in FZ of the EBW joint is principally attributed to coarser acicular martensite α′ and lower aluminum element in EBW joint.
研究不足
The study focuses on the comparison between LBW and EBW processes for Ti–6Al–4V alloy plates, and the findings may not be directly applicable to other materials or welding methods.
1：Experimental Design and Method Selection
Ti–6Al–4V alloy plates with a thickness of 4 mm were joined by electron beam welding (EBW) and laser beam welding (LBW). The comparison was performed according to grain morphology, microstructure, aluminum distribution, and microhardness of the joints.
2：Sample Selection and Data Sources
The parent metal adopted in the experiment is the Ti–6Al–4V plates with a thickness of 4 mm. The plates are machined into 100 mm × 50 mm.
3：List of Experimental Equipment and Materials
LBW is performed using a PG YLS-6000 laser, while the laser optical set up is attached on a KUKA KR30HA commercial robot. The 99.99% pure argon at 11 L/min flow rate is employed for the purpose of shielding. In addition, the ZD150-30A EBW machine is adopted in the EBW experiment.
4：Experimental Procedures and Operational Workflow
Before the welding process, the weldments are cleaned by mechanical grinding in order to eliminate the inclusion of impurities. After the welding experiment, the samples (15 mm × 10 mm × 4 mm) are cut along the welding direction with a linear cutting machine. Then digital photographs were employed to obtain the macro morphology of the joint cross-section. The metallographic specimens were prepared by mounted, polished and etched employing Kroll’s reagent. Micro-Vickers' hardness profiles of the joints were attained with a microhardness tester (HXS-1000A) under a test load of 500 N for 10 s.
5：Data Analysis Methods
The comparison of LBW and EBW was performed according to grain morphology, microstructure, aluminum distribution, and microhardness of the joints.
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