Comparison of Image Analysis Techniques for the Determination of the Influence of Melt Flow on the Solidification Microstructure of Technical Aluminum Alloys | Chapter 5 | | Proceedings of the 8th International Conference on Solidification and Gravity

This work aims to contribute to the improvement of automated analysis of 2D microstructures in technical aluminum alloys by evaluating the effectiveness of various microstructural image analysis methods: Traditional analysis techniques for 2D images and cutting-edge computer vision deep learning-based methods (Mask Region-based Convolutional Neural Networks or Mask R-CNN [1], a model used to detect the position and exact shape of objects) are compared for detecting, classifying, and quantifying microstructural features in technical iron containing aluminum alloys. Determining that deep learning-based methods lead to comparable or better results would allow for such models to be used for analysis of the chosen microstructural features. This could improve detection accuracy and speed, as well as measurement reproducibility.

The focus is on detecting and characterizing Fe-containing intermetallic phases that precipitate during solidification, with the aim of examining the effects of increased iron content on the microstructure of these alloys. Therefore, the microstructure of directionally solidified hypoeutectic AlSi6Cu4Fe1 and hypereutectic AlSi6Cu4Fe2 alloys is analyzed with regards to area fraction and size of the intermetallic precipitates within two distinct sample processing zones: the first half of the samples was solidified under diffusive mass transport conditions and the second under forced convective conditions, both in microgravity. This dual approach allows for the evaluation of the impact of convection on the microstructure of aluminum alloys with elevated iron content.

 

Author (s) Details

 

Golo Zimmermann
RWTH Aachen University, Foundry Institute, Intzestraße 5, 52072 Aachen, Germany.

 

Sonja Steinbach
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany.

Laszlo Sturz
ACCESS e.V., Intzestraße 5, 52072 Aachen, Germany.

 

Alexandre Viardin
ACCESS e.V., Intzestraße 5, 52072 Aachen, Germany.

 

Angelos Theofilatos
ACCESS e.V., Intzestraße 5, 52072 Aachen, Germany.

 

Florian Kargl
RWTH Aachen University, Foundry Institute, Intzestraße 5, 52072 Aachen, Germany and Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany.

 

Please see the book here:- https://doi.org/10.9734/bpi/mono/978-93-49473-95-9/CH5

Heat Transfer for Engineering Students | Book Publisher International

 Heat transfer is a common occurrence in manufacturing and other aspects of life, therefore specific applications of heat transfer are not difficult to come by. When two systems have a temperature difference, heat is a form of energy in transmission that moves from one to the other without transferring mass. Heat transfer problems are sometimes classified as either steady (also known as steady state) or transient (also known as transient) in nature (also called unsteady). One or more of the following types of heat transfer are used: conduction, convection, and radiation. Conduction is another name for heat diffusion. A solid-fluid interface, a temperature difference between the solid surface and the surrounding fluid, and fluid motion are all required for convection heat transfer. Heat radiation is the movement of heat from a body with a high temperature to a body with a lower temperature when the bodies are not in direct physical contact with each other or separated in space. The two basic ways of mass movement are molecular diffusion and convection.

Author(S) Details

Dhamyaa Saad Khudhur
Mechanical Engineering Department, Mustansiriyah University, Iraq.

Muna S. Kassim
Mechanical Engineering Department, Mustansiriyah University, Iraq.

Mahmoud A. Mashkour
Mechanical Engineering Department, University of Technology, Iraq.

Laith Jaafer Habeeb
Training and Workshop Center, University of Technology, Iraq.

View Book:- https://stm.bookpi.org/HTES/article/view/5021

Heat Transfer Analysis in 4-Pass 500HP Fire-Tube Boiler | Chapter 14 | New Approaches in Engineering Research Vol. 10

 The steady-state heat transfer study in a 4-pass fire-tube boiler is the subject of this paper. The heat transmission between the combustion gases and the boiler tube walls has been studied using a computer software. The energy balance was constructed on these surfaces, taking into account heat movement by convection and thermal radiation. For various working settings, the heat transfer properties, particularly the heat flux densities and corresponding wall temperatures, are examined. The modelling approach was confirmed by comparing calculated output gas temperature to experimental data from the PFTA 500HP fire-tube boiler for three different fuels and different operating pressures. The comparison reveals that the calculated findings are quite close to the experimental data from the boiler. A parametric analysis was also carried out to look at the effect of working pressure on the boiler's thermal behaviour.

Author (S) Details

Ahmed Rahmani
Department of Mechanical Engineering, University of Oum El Bouaghi, 04000, Algeria.

Messaoud Djeddou
Research Laboratory in Subterranean and Surface Hydraulics (LARHYSS), Faculty of Sciences and Technology, Mohamed Khider University, Biskra, Algeria.

View Book :- https://stm.bookpi.org/NAER-V10/article/view/2990

Developing the Numerical Simulation of Multicomponent Alloy Solidification | Chapter 3 | Advanced Aspects of Engineering Research Vol. 16

 A non-equilibrium model was used to study multicomponent melt solidification, in which a Stefan problem with two borders was addressed numerically, the boundaries being between the solid phase and the two-phase transition zone, and between the two-phase transition zone and the liquid phase. The two-phase zone is represented by a porous material with varied porosity. The additional force preventing melt flow due to porosity is taken into account in the same way that Darcy's law is taken into account. Computer simulations were used to simulate the solidification of Sn-20 wt. percent Pb binary alloys via the process of downward-directed crystallisation along the gravity vector. The results of a quasi two-dimensional benchmark experiment on horizontal (i.e., perpendicular to the gravity vector) directional solidification of a binary Sn-3 wt. percent Pb alloy are presented in the publication. Two crystallisation models were used in the calculations: equilibrium and non-equilibrium crystallisation. The non-equilibrium model is proven to provide a more accurate depiction of natural convection-induced heat field evolution and solute dispersion. Solidification, binary alloy, dual-phase region, macrosegregation, convection, heat-mass transfer, modelling, comparison with experimental results, columnar-to-equiaxed transition Keywords: solidification, binary alloy, dual-phase region, macrosegregation, convection, heat-mass transfer, modelling, comparison with experimental results (CET).

Author (S) Details

V. P. Ginkin
Institute for Physics and Power Engineering (IPPE), Bondarenko sq.1, 249033 Obninsk, Russia.

S. M. Ganina
Institute for Physics and Power Engineering (IPPE), Bondarenko sq.1, 249033 Obninsk, Russia.

A. V. Kartavykh
Technological Institute for Superhard and Novel Carbon Materials (TISNCM, Moscow branch), B.Tolmachevsky per.5, 119017 Moscow, Russia.

View Book :- https://stm.bookpi.org/AAER-V16/article/view/1988