scholarly journals Extended Method of Volume Change Measurements during Solidification of Lamellar Graphite Iron

2018 ◽  
Vol 925 ◽  
pp. 163-170 ◽  
Author(s):  
Péter Svidró ◽  
Attila Diószegi ◽  
Pär G. Jönsson
Keyword(s):  
Thermal Analysis ◽  
Volume Change ◽  
Research Work ◽  
Fourier Thermal Analysis ◽  
Geometrical Center ◽  
Solidification Sequence ◽  
Marine Industry ◽  
Spherical Sample ◽  
Lamellar Graphite ◽  
Measurement Approach

Lamellar graphite iron (LGI) is an important technical alloy used to produce cast components for the automotive and the marine industry. The performance of the component is defined by the solidification sequence. Therefore, a lot of research work has been done in the field of solidification. The present work introduces a new measurement approach that combines advanced dilatation measurements with thermal analysis to investigate the solidification of LGI. The method involves a thermally balanced spherical sample. The temperature values are measured in the geometrical center and on the surface of the sample. The released heat of solidification is calculated by using the Fourier Thermal Analysis (FTA) method. The displacement values are measured on the surface of the sample. The volume change is calculated from the displacement data. The dilatation results clearly shows the advantage of the multidirectional measurement.

Thermal Response Analysis and FE Modeling of Weapon

2012 ◽  
Vol 503-504 ◽  
pp. 11-14
Author(s):  
Yan Jun Zhao ◽  
Xin Jun Li ◽  
Yong Hai Wu ◽  
Cheng Xu
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Temperature Field ◽  
Research Work ◽  
Thermal Response ◽  
Element Model ◽  
Response Analysis ◽  
Fe Modeling ◽  
Effects Of Temperature ◽  
The Finite Element Model

Thermal is a important factor that affect weapon firing accuracy and security in the process of weapon fire, so thermal analysis of weapon has important meaning . Aim at researched Weapon, the finite element model of the gun body was built, the temperature field of the gun body was calculated by FEM. The effects of temperature of the gun body on firer and aiming mechanism were also studied. Current research work will be helpful the weapon design

Thermal and Kinetic Analysis of the solidification of a near eutectic Al-Cu Alloy

2014 ◽  
Vol 1611 ◽  
pp. 105-110
Author(s):  
M. Morua ◽  
M. Ramirez-Argaez ◽  
C. Gonzalez-Rivera
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Kinetic Analysis ◽  
Eutectic Growth ◽  
Eutectic Solidification ◽  
Cooling Curves ◽  
Transfer Coefficients ◽  
Fourier Thermal Analysis ◽  
Cu Alloy ◽  
Solidification Kinetics

ABSTRACTIn this work the thermal and kinetic analysis of the cooling and solidification of a near eutectic Al-Cu alloy is performed using inverse thermal and solidification kinetics analysis. The Fourier thermal analysis is applied to experimental cooling curves to obtain data on solid fraction evolution and latent heat of solidification. Inverse thermal analysis is applied to calculate the global heat transfer coefficients that allow correct simulation of the cooling of experimental probes. The free growth method is used to obtain the eutectic growth coefficients. All the obtained parameters are feed into a heat transfer-solidification kinetics model to validate the methodology and results generated from this work. It is found a relatively good agreement between experimental and predicted cooling curves which suggest that this methodology could be used to generate useful information needed to simulate eutectic solidification.

An Automatic Selection of Segment Width for the Single Sensor Differential Thermal Analysis (SS-DTA) Based on Piecewise Linear Approximation Technique

2015 ◽  
Vol 658 ◽  
pp. 96-100 ◽  
Author(s):  
Wutipong Nieampradit ◽  
Sarawan Wongsa ◽  
Isaratat Phung-On
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Transformations ◽  
Linear Approximation ◽  
Piecewise Linear ◽  
Research Work ◽  
Piecewise Linear Approximation ◽  
Approximation Technique ◽  
Analytical Formulae ◽  
Single Sensor

Single Sensor Differential Thermal Analysis (SS-DTA) is a novel non-destructive testing technique for studying and detecting the phase transformations and structural changes in materials. It uses only one temperature sensor to measure the temperature in a particular point of interest in the material during actual and simulated thermal processing of the material. SS-DTA compares the temperature recorded in a tested specimen against a reference thermal profile which can be generated either by analytical formulae or piecewise linear approximation. The main advantage of piecewise linear approximation over the analytical formulae is that it does not need the knowledge of tested material and processing conditions to optimally estimate the parameters of reference thermal history. On the other hand, in order to apply the piecewise linear approximation technique we must specify the segment width which is normally fixed at a nominal value of 1.5 seconds. We have recently found that this nominal value might not be an optimal choice for the segment width as it does not guarantee to give the best detectability of phase transformation. Therefore, in this research work we proposed a technique to automatically select an appropriate value of the segment width. The performance of proposed method has been evaluated by investigating the phase transformations of welded stainless steel SUS 321and SUS 304. It was found that the appropriate segment width could be ranging from 1.25-1.75 seconds and by using this selection technique, we could detect the differential temperature more accurately than when using the nominal value.

Analysis of the Antimony and Strontium Cross-Effects in Al-Si Foundry Alloys

2014 ◽  
Vol 790-791 ◽  
pp. 464-469
Author(s):  
Monika Tokár ◽  
György Fegyverneki ◽  
Valéria Mertinger
Keyword(s):  
Thermal Analysis ◽  
Image Analysis ◽  
Eutectic Temperature ◽  
Eutectic Silicon ◽  
Research Work ◽  
Cooling Curves ◽  
Computer Image Analysis ◽  
Unmodified Alloy ◽  
Foundry Alloys ◽  
Modification Rate

In this work we show the effect of various concentrations of strontium and antimony on the level of modification in the Al-Si alloy. The scale of the modification rate was determined in two ways: thermal analysis was performed and the images of the samples. The eutectic temperature registered during the analysis were compared to the eutectic temperature of the unmodified alloy and on the basis of them was determined which samples are registered as modified, which are not. On the basis of the results of the cooling curves the partially modified category was introduced, if the ΔT value is less than 9°C and more than 7.5°C. The samples made of the alloys were examined with a computer image analysis and the samples were grouped on the basis of the size of the eutectic silicon phases. The aim of our research work was the examination of cross-effects of strontium and antimony.

scholarly journals Thermal Modelling and Analysis of A 10HP Induction Machine Using the Lumped Parameter Approach

2021 ◽  
Vol 13 (6) ◽  
Author(s):  
Oti S.Ejiofor ◽  
◽  
Awah Chukwemeka ◽  
Chibuzo Nnonyelu ◽  
Ogbonnaya I.Okoro ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Life Span ◽  
Thermal Model ◽  
Research Work ◽  
Induction Machine ◽  
Thermal Modelling ◽  
Thermal Limits ◽  
Lumped Parameter ◽  
Parameter Approach ◽  
Different Parts

The essence of this research work is to develop a thermal model for an induction machine that will enable the prediction of temperature in different parts of the machine. This is very important first to the manufacturer or designer of an induction machine because with these predictions one can decide on the insulation class limits the machine belongs to. Also modern trends in the construction of machines is moving in the direction of making machines with reduced weights, costs and increased efficiency. In order to achieve this, the thermal analysis becomes very crucial in deciding on what types of insulators and other materials that would be used to make these machines. In industries, the knowledge of the thermal limits of machines if well utilized increases the life span of the machines and reduces downtime; thereby increasing production and profit. Specifically, this paper (i) predicted the temperature limits of the induction machine and its components, (ii) developed an accurate thermal model for an induction machine, (iii) predicted the temperature in different parts of the induction machine using the thermal model and software program and lastly (iv) investigated how the machine symmetry is affected by the nodal configuration.

Fourier Thermal Analysis of the Eutectic Formed in Pb-Sn Alloys

2009 ◽  
Vol 18 (4) ◽  
pp. 441-445 ◽  
Author(s):  
H. Cruz ◽  
M. Ramírez-Argaez ◽  
A. Juarez ◽  
A. Garcia ◽  
C. González-Rivera
Keyword(s):  
Thermal Analysis ◽  
Fourier Thermal Analysis

Fourier Thermal Analysis of Eutectic Al-Si Alloy with Different Sr Content

2010 ◽  
Vol 1276 ◽  
Author(s):  
R. Aparicio ◽  
G. Barrera ◽  
G. Trapaga ◽  
C. Gonzalez
Keyword(s):  
Thermal Analysis ◽  
Base Alloy ◽  
A356 Alloy ◽  
Microstructural Characterization ◽  
Emission Spectrometry ◽  
Fourier Thermal Analysis ◽  
Solidification Kinetics ◽  
Kinetics Of ◽  
Electrical Resistance Furnace

AbstractThe purpose of this work is to explore the capability of Fourier Thermal Analysis (FTA) to detect differences in solidification kinetics between unmodified and Sr modified eutectic Al-Si alloy obtained from the same base alloy. Experimental melts are produced in silicon carbide crucibles using an electrical resistance furnace and burdens of A356 alloy and commercial purity Si. The addition of strontium to the melts is accomplished using Al-10 pct Sr master alloy rod. Chemical composition is controlled using spark emission spectrometry. The changes in microstructure are characterized using optical microscopy. Thermal analysis are performed in cylindrical stainless steel cups coated with a thin layer of boron nitride, using two type-K thermocouples connected to a data acquisition system. Experimental cooling curves are numerically processed using FTA. Results show changes in solidification kinetics of eutectic Al-Si alloy with different Sr content. These changes, measured at the beginning and during solidification of the probes, can be related to the changes in nucleation and growth causing the differences detected during microstructural characterization of the probes.

Solidification Control by Thermal Analysis of La/Ba Inoculated Grey Cast Iron

2015 ◽  
Vol 1128 ◽  
pp. 35-43
Author(s):  
Eduard Marius Stefan ◽  
Mihai Chisamera
Keyword(s):  
Thermal Analysis ◽  
Cast Iron ◽  
Research Work ◽  
Structure And Properties ◽  
Analysis Method ◽  
Cast Irons ◽  
Analysis Technique ◽  
Grey Cast ◽  
Solidification Parameters ◽  
Solidification Control

Thermal analysis is worldwide used in foundry for control of structure and properties of cast irons. In this paper is presented the experimental study realized to control the inoculation effect by thermal analysis method of inoculated grey cast irons. For this purpose was conducted an in ladle inoculation process with 0.5wt. % inoculant from LaCaAlFeSi and BaCaAlFeSi alloy systems. The main goals of this experimental research work are: to determine the particular characteristics of the registered cooling curves, to notice the solidification parameters that present sensibility as against inoculant addition in treated cast iron and eventually to improve thermal analysis technique of cast irons.

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