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Microstructural evolution and mechanical properties of LDED Ti-6Al-4 V alloy polished with a hybrid laser polishing technique
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Microstructural evolution and mechanical properties of LDED Ti-6Al-4 V alloy polished with a hybrid laser polishing technique
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Microstructural evolution and mechanical properties of LDED Ti-6Al-4 V alloy polished with a hybrid laser polishing technique
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Journal Article
Microstructural evolution and mechanical properties of LDED Ti-6Al-4 V alloy polished with a hybrid laser polishing technique
2024
Overview
The additive manufacturing is a free-form metal deposition process, which allows generating a prototype or small series of near net-shape structures. Despite numerous advantages, one of the most critical issues of the technique is that produced pieces have a deleterious surface quality which requires post machining. Besides conventional post processes such as turning, milling, or photo-chemical etching, laser processes are increasingly being used for surface finishing of metals. In this study, a hybrid laser polishing technique consisting of nanosecond pulsed laser material removal and continuous wave (CW) laser polishing was utilized to polish the laser directed energy deposition (LDED) Ti-6Al-4 V samples. To account for this, the effect of hybrid laser polishing on the surface modification of LDED Ti-6Al-4 V alloy has been investigated. The surface morphology, microstructure evolution, and mechanical properties of the as-fabricated, the pulsed laser material removal processed, and the hybrid laser polishing processed samples were investigated. The results revealed that hybrid laser polishing not only eliminates the unmelted particles, oxides, and defects of as-fabricated Ti-6Al-4 V but also reconstructs the surface morphology, which improved the surface roughness by 98.32%. After hybrid laser polishing, the average thickness of the remelted layer has increased to 85 μm, while the acicular martensite α´ grows epitaxially from the substrate across the layer bands. Additionally, due to the formation of α′ martensite, the microhardness is about 21.02% higher than LDED Ti-6Al-4 V sample. The wear rate is decreased from 1.36 × 10−3 to 0.86 × 10−3 mm3/N·m, which was reduced by 38.23% compared to the as-fabricated.
