Phase-Field Study of the Competitive Growth Mechanism of Dendrites in the Directed Energy Deposition Melt Pool of RCF103 Alloy

In DED melt pools, high solidification rates and temperature gradients complicate characterizing competitive dendrite growth. To address this, the WBM phase-field method simulates dendrite growth in the RCF103 alloy, revealing correlations between tilted dendrites and solidification parameters. It explores the competitive mechanism between different dendrite morphologies (columnar and seaweed) and the role of surface energy anisotropy and tip undercooling in determining dendrite shape. These findings enhance our understanding of DED melt pool dendrite growth, facilitating the establishment of a relationship between solidification structure, conditions, and process parameters.