Insight into the mechanisms of columnar to equiaxed grain transition during metallic additive manufacturing
By Pengwei Liu, Zhuo Wang, Yaohong Xiao, Mark F. Horstemeyer, Xiangyang Cui, Lei Chen. Additive Manufacturing, 2019
244 citations recorded by the source corpus.
Abstract The columnar to equiaxed transition (CET) of grain structures associated with processing conditions has been observed during metallic additive manufacturing (AM). However, the formation mechanisms of these grain structures have not been well understood under rapid solidification conditions, especially for AM of superalloys. This paper aims to uncover the underlying mechanisms that govern the CET of AM metals, using a well-tested multiscale phase-field model where heterogeneous nucleation, grain selection and grain epitaxial growth are considered. Using In718 as an example, the simulated results show that the CET is critically controlled by the undercooling, involving constitutional supercooling, thermal and curvature undercoolings in the melt pool, which dictates the extent of heterogeneous nucleation with respect to the grain epitaxial growth during rapid solidification.
Subfields: Aerospace Engineering, Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/36957a85ee717f13a7d87c011229bf1aa09eb3b3
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Citations in the corpus
- Towards understanding grain nucleation under Additive Manufacturing solidification conditions (2020, background): “The Interdependence Model proposes that the grain size, d, is the sum of three components, i.e. (1a) which is based on the following analytical equation ( ( ) ) (1b) where is the amount of growth a grain must undertake to generate sufficient TCS required for nucleation, is the length of the solute d”