THE CLOSED ROOM TEMPERATURE DISTRIBUTION DYNAMIC ANALYSIS VIA THE DIFFERENTIAL-DISCRETE MATHEMATICAL MODELING

1992 ◽  
Author(s):  
Nebojsa N. Milojevic ◽  
Dragutin Lj. Debeljkovic
Keyword(s):  
Mathematical Modeling ◽  
Temperature Distribution ◽  
Dynamic Analysis ◽  
Room Temperature

scholarly journals Simulation of Diffusion Processes in Chemical and Thermal Processing of Machine Parts

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 698
Author(s):  
Kateryna Kostyk ◽  
Michal Hatala ◽  
Viktoriia Kostyk ◽  
Vitalii Ivanov ◽  
Ivan Pavlenko ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Temperature Distribution ◽  
Thermal Treatment ◽  
Diffusion Processes ◽  
Nitrogen Concentration ◽  
The Body ◽  
Functional Dependencies ◽  
Technological Parameters ◽  
Gas Nitriding ◽  
Temperature State

To solve a number of technological issues, it is advisable to use mathematical modeling, which will allow us to obtain the dependences of the influence of the technological parameters of chemical and thermal treatment processes on forming the depth of the diffusion layers of steels and alloys. The paper presents mathematical modeling of diffusion processes based on the existing chemical and thermal treatment of steel parts. Mathematical modeling is considered on the example of 38Cr2MoAl steel after gas nitriding. The gas nitriding technology was carried out at different temperatures for a duration of 20, 50, and 80 h in the SSHAM-12.12/7 electric furnace. When modeling the diffusion processes of surface hardening of parts in general, providing a specifically given distribution of nitrogen concentration over the diffusion layer’s depth from the product’s surface was solved. The model of the diffusion stage is used under the following assumptions: The diffusion coefficient of the saturating element primarily depends on temperature changes; the metal surface is instantly saturated to equilibrium concentrations with the saturating atmosphere; the surface layer and the entire product are heated unevenly, that is, the product temperature is a function of time and coordinates. Having satisfied the limit, initial, and boundary conditions, the temperature distribution equations over the diffusion layer’s depth were obtained. The final determination of the temperature was solved by an iterative method. Mathematical modeling allowed us to get functional dependencies for calculating the temperature distribution over the depth of the layer and studying the influence of various factors on the body’s temperature state of the body.

Effect of titanium alloys elasticity modulus on warping of stamped blanks during cooling

2021 ◽  
pp. 221-227
Author(s):  
M.O. Smirnov ◽  
A.M. Zolotov ◽  
A.M. Tyukhtyaev
Keyword(s):  
Mathematical Modeling ◽  
Titanium Alloys ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Elasticity Modulus ◽  
Preliminary Deformation ◽  
Wide Spread ◽  
Temperature Dependences ◽  
Cumulative Deformation ◽  
The Difference

Wide spread in the values of the elasticity modulus of the titanium VT6 alloy and its analogs Ti—6Al—4V, Ti—6Al—4V ELI at room temperature and at elevated temperatures is revealed аs result of the literature sources analysis. The data are ambiguous, the available temperature dependences of the elasticity modulus have very different values starting from the temperature T l 500 °C. Mathematical modeling of the warping process is carried out on the example of figurine-shaped stamped blank of turbine blade using various dependences of the elasticity modulus on temperature. Cases of warping during cooling of stamped blank after cooling-down in stamp with and without cumulative deformation are considered. The difference in the course of thermal deformations during the cooling of the workpiece is obtained using different temperature dependences of the elasticity modulus. The presence of preliminary deformation increases the warping of the workpieces.

Real Time Temperature Distribution During Sealing Process and Room Temperature Air Gap Measurements of a Hall-Heroult Cell Anode

2011 ◽  
pp. 991-996 ◽  
Author(s):  
Olivier Trempe ◽  
Daniel Larouche ◽  
Donald Ziegler ◽  
Michel Guillot ◽  
Mario Fafard
Keyword(s):  
Temperature Distribution ◽  
Real Time ◽  
Room Temperature ◽  
Air Gap ◽  
Cell Anode

Real time temperature distribution during sealing process and room temperature air gap measurements of a hall-héroult cell anode

2011 ◽  
pp. 991-996
Author(s):  
Olivier Trempe ◽  
Daniel Larouche ◽  
Donald Ziegler ◽  
Michel Guillot ◽  
Mario Fafard
Keyword(s):  
Temperature Distribution ◽  
Real Time ◽  
Room Temperature ◽  
Air Gap ◽  
Cell Anode

Growth Temperature Uniformity of MBE-Grown GaAs Determined by Scanning Room Temperature Photoluminescence

1994 ◽  
Vol 340 ◽  
Author(s):  
K. Stair ◽  
T. Bird ◽  
A. Moretti ◽  
F. Chambers ◽  
C. Choi-Feng
Keyword(s):  
Growth Rate ◽  
Quantitative Analysis ◽  
Temperature Distribution ◽  
Quantum Well ◽  
Growth Temperature ◽  
Room Temperature ◽  
Epitaxial Layers ◽  
Temperature Uniformity ◽  
Room Temperature Photoluminescence

ABSTRACTWe have used scanning room temperature photoluminescence to map GaAs quantum well widthsand AIGaAs barrier compositions over 2-inch and 3-inch diameter epitaxial layers grown by MBE at temperatures ranging from 600 to 700ºC. Analysis of these maps allows a nondestructive quantitative analysis of the GaAs growth rate uniformity from which we can calculate the temperature distribution during growth. We have used this technique to compare the thermal uniformity of various substrate holders designed for use in the Intevac ModGenII MBE system.

Strong memory effect at room temperature in nanostructured granular alloy Co0.3Cu0.7

RSC Advances ◽  
2015 ◽  
Vol 5 (116) ◽  
pp. 95695-95702 ◽  
Author(s):  
S. Dhara ◽  
R. Roy Chowdhury ◽  
B. Bandyopadhyay
Keyword(s):  
Temperature Distribution ◽  
Memory Effect ◽  
Room Temperature ◽  
Blocking Temperature ◽  
Magnetic Memory

Non-interacting magnetic CoCu nanoparticles with a blocking temperature distribution show strong magnetic memory effect even at room temperature.

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