Microstructure Modeling and Characterization

2021 ◽  
pp. 43-82
Author(s):  
François Willot
Keyword(s):  
Microstructure Modeling

scholarly journals Reconstruction of Microscopic Thermal Fields from Oversampled Infrared Images in Laser-Based Powder Bed Fusion

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4859
Author(s):  
Leigh Stanger ◽  
Thomas Rockett ◽  
Alistair Lyle ◽  
Matthew Davies ◽  
Magnus Anderson ◽  
...  
Keyword(s):  
Transfer Function ◽  
Measured Signal ◽  
Powder Bed Fusion ◽  
Validation Data ◽  
Powder Bed ◽  
Spatial Gradients ◽  
Microstructure Modeling ◽  
Thermal Fields ◽  
Significant Difference ◽  
Spatial Transfer Function

This article elucidates the need to consider the inherent spatial transfer function (blur), of any thermographic instrument used to measure thermal fields. Infrared thermographic data were acquired from a modified, commercial, laser-based powder bed fusion printer. A validated methodology was used to correct for spatial transfer function errors in the measured thermal fields. The methodology was found to make a difference of 40% to the measured signal levels and a 174 °C difference to the calculated effective temperature. The spatial gradients in the processed thermal fields were found to increase significantly. These corrections make a significant difference to the accuracy of validation data for process and microstructure modeling. We demonstrate the need for consideration of image blur when quantifying the thermal fields in laser-based powder bed fusion in this work.

Right Ventricular Myocardial Mechanics: Multi-Modal Deformation, Microstructure, Modeling, and Comparison to the Left Ventricle

2020 ◽  
Author(s):  
Sotirios Kakaletsis ◽  
William D Meador ◽  
Mrudang Mathur ◽  
Gabriella P Sugerman ◽  
Tomasz Jazwiec ◽  
...  
Keyword(s):  
Left Ventricle ◽  
Right Ventricular ◽  
Myocardial Mechanics ◽  
Deformation Microstructure ◽  
Microstructure Modeling

scholarly journals Heat flow and heat transfer coefficient during crystallization under the pressure

2018 ◽  
Vol 157 ◽  
pp. 02036
Author(s):  
Richard Pastirčák ◽  
Ján Ščury ◽  
Tomáš Fecura
Keyword(s):  
Heat Transfer ◽  
Heat Flow ◽  
Solidification Process ◽  
Metal Mold ◽  
Transfer Coefficients ◽  
Microstructure Modeling ◽  
Heat Transfer Coefficients ◽  
Flow And Heat Transfer ◽  
Solidification Processes ◽  
Precise Prediction

Estimation of the heat flow at the metal-mold interface is necessary for accurate simulation of the solidification processes. For the numerical simulation, a precise prediction of boundary conditions is required to determine the temperature distribution during solidification, porosity nucleation, microstructure development, and residual stresses. Determination of the heat transfer coefficients at the metal-mold interface is a critical aspect for simulation of the solidification process and the microstructure modeling of the castings. For crystallization under the pressure and for thin-walled castings, HTC evaluation is important due to the very limited freezing time.

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