The numerical simulation of element segregation control during the electron beam cold hearth melting process of large-sized Ti-6wt%Al-4wt%V titanium alloy slab
Large-scale Ti-6wt%Al-4wt%V alloy ingots exhibit aluminum evaporation tendency and macrosegregation phenomena during the electron beam cold hearth melting (EBCHM) process. To address these challenges, this study innovatively proposes using the design of a multi-overflow-port melting pool strengtheni...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425012529 |
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| Summary: | Large-scale Ti-6wt%Al-4wt%V alloy ingots exhibit aluminum evaporation tendency and macrosegregation phenomena during the electron beam cold hearth melting (EBCHM) process. To address these challenges, this study innovatively proposes using the design of a multi-overflow-port melting pool strengthening method, implemented on opposite sides, drawing inspiration from pyrometallurgical copper refining techniques. A numerical model was developed to investigate the method's effectiveness in suppressing the longitudinal development of the melting pool and enhancing melt homogenization. Experiments conducted using an electron beam button furnace validated the model, demonstrating good agreement in terms of melting pool morphology and aluminum distribution. The numerical simulation results indicate that the multiple overflow ports design effectively suppresses the longitudinal development of the impact cavity and improves element uniformity. Specifically, at a casting speed of 20 mm/min and a temperature of 2273 K, the design reduces the thermal impact cavity depth by 146.19 mm and the maximum aluminum concentration difference by 0.616 wt% compared to the single overflow port design. This study provides a technical and theoretical foundation for homogenization control in the casting of large-sized Ti-6wt%Al-4wt%V ingots. |
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| ISSN: | 2238-7854 |