Work

Numerical simulation using a coupled lattice Boltzmann–cellular automata method to predict the microstructure of Ti–6Al–4V after electron beam cold hearth melting

Year: 2025

Type: article

Abstract: A coupled lattice Boltzmann–cellular automata simulation method was developed to investigate the effects of electron beam heat sources on melt pool dynamics and process parameters on the microstructure of Ti–6Al–4V alloy during electron beam cold hearth melting (EBCHM) process. Temperature distribution and fluid flow behaviours within the melt pool were analysed, with findings indicating that an optimized beam power distribution leads to a more uniform temperature and stable melt pool profile, mitigating the risks of excessive melt vaporization. The simulation results reveal the influence of casting speed on melt pool depth, temperature gradients, and the columnar-to-equiaxed transition. The results indicate that higher casting speeds promote shallower melt pools and reduce temperature gradients, enhancing equiaxed grain nucleation and promoting more isotropic microstructures. This approach supports the effective control of microstructure and composition uniformity in EBCHM-produced ingots.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2025.04.053

Authors: Wonjoo Lee, Yong-Taek Hyun, Jong Woo Won, Howon Lee, Seong-Hoon Kang, Jonghun Yoon

Institutions: Hanyang University, Korea Institute of Materials Science

Language: English

Topic: Solidification and crystal growth phenomena

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,640

Funders: Ministry of Trade, Industry and Energy, Korea Institute for Advancement of Technology, National Research Foundation of Korea, Ministry of Science and ICT, South Korea