Spatial Variation of Thermokinetics and Associated Microstructural Evolution in Laser Surface Engineered IN718: Precursor to Additive Manufacturing

Thermokinetically Driven Microstructural Evolution in Laser‐Based Directed Energy‐Deposited CoCrMo Biomedical Alloy

“…[ 22 ] Such microstructural features in L‐DED‐fabricated samples were expected to result due to variation in thermokinetic parameters within the processed melt pool. [ 31 ]…”

“…Additional details related to the computational model can be learnt in multiple earlier publications of the authors on the similar subject matter. [ 24,30,31 ]…”

“…[22] Such microstructural features in L-DED-fabricated samples were expected to result due to variation in thermokinetic parameters within the processed melt pool. [31] The variation in cellular spacing within the L-DED-fabricated CoCrMo, as a function of laser power used for fabrication of the samples, was also identified. In view of this observation, the quantification of cellular spacing (λ 1 ) was conducted by considering multiple micrographs (10) from various regions of the sample from each processing condition.…”

“…[24] In light of this, with established knowledge of various physical phenomena associated with laser interaction, an FEM model was developed on a commercially available COMSOL multiphysics platform. [24,25,30,31] The following assumptions were considered to facilitate the efficient computation of the 3D L-DED model. 1) Computational domains corresponding to substrate and precursor powder deposit were considered to be isotropic.…”

“…Additional details related to the computational model can be learnt in multiple earlier publications of the authors on the similar subject matter. [24,30,31] With this thermokinetic model, spatial and temporal distributions of temperature were predicted. This approach allowed to probe the temperature evolution at a fixed location during laser material deposition with multiple tracks and multiple layers.…”