Columnar Grain - an overview | ScienceDirect Topics
Further from the mould surface, the grain structure evolves into columnar grains growing roughly perpendicular to the mould surface. The origin of the columnar zone was first analyzed by Walton …
Grain structure control during metal 3D printing by high-intensity ...
Jan 9, 2020 · Additive manufacturing (AM) of metals, also known as metal 3D printing, typically leads to the formation of columnar grain structures along the build direction in most as-built metals and...
Control of Columnar Grain Microstructure in CSD LaNiO3 Films
In this work, we carry out a detailed structural analysis of LNO films prepared on a Si-SiO 2 substrate at various stages of crystal structure formation, visualizing for the first time the mechanism of columnar …
This chapter considers such competing growth mechanisms, with the objective of predicting the grain structure that will appear under a specific solidification practice.
Columnar grains - Big Chemical Encyclopedia
In Zone (A), the structure consists of columnar grains which are capped by a domelike top. In Zone (B), the structure is also columnar but more faceted and angular. In Zone (C), it consists of fine accost …
Columnar grain morphology and mechanical anisotropy of face …
Nov 1, 2023 · The columnar grain morphology (grain shape and orientation) in polycrystalline metals is generally considered to contribute to mechanical anisotropy due to the interaction of dislocations with …
Compositional criteria to predict columnar to equiaxed transitions in ...
Jul 1, 2025 · Predicting the columnar to equiaxed transition (CET) and grain refinement for additively manufactured alloys from thermodynamic databases has been a long-standing challenge and an …
Grain Structure in Different Metals - EOXS
– Equiaxed Grains: Grains are roughly equal in all dimensions, leading to uniform properties in all directions. – Columnar Grains: Elongated grains that typically form when a metal solidifies in a …
Prediction of columnar and equiaxed grain morphologies during wire …
May 9, 2025 · Columnar grains are typically elongated, and in additive manufacturing grow roughly parallel to the build direction. Equiaxed grains are randomly oriented with relatively equal dimensions …
Columnar grain structure - Big Chemical Encyclopedia
At higher temperatures, deposits tend to be columnar (Fig. 2.13 a and b) as a result of uninterrupted grain growth toward the reactant source. The structure is also often dependent on the thickness of …