A Calculation Method for the Coupling of Temperature and Concentration during Inconel 718 Alloy Solidification

2021 ◽  
Vol 315 ◽  
pp. 50-55
Author(s):  
Xiao Hui Ao ◽  
Huan Xiong Xia ◽  
Jian Hua Liu ◽  
Qi Yang He ◽  
Sheng Xiang Lin
Keyword(s):  
Calculation Method ◽  
Inconel 718 ◽  
Effect Of Temperature ◽  
Cooling Process ◽  
Inconel 718 Alloy ◽  
Alloy Solidification ◽  
Interface Growth ◽  
Kinetic Undercooling ◽  
Solid Liquid Interface ◽  
Solid Liquid

Due to the temperature and concentration determine the kinetic undercooling of interface growth and nucleation undercooling inside the melt, they play an important role in the solidification microstructure of the alloy. In this paper, the effect of temperature gradient and cooling rate on the dynamic undercooling was studied and the mechanism of the concentration at the solid-liquid interface on the kinetic undercooling during the continuous cooling process was analyzed. A calculation method for the coupling of temperature and concentration during Inconel 718 alloy solidification was developed, which can solve the problem that the concentration and temperature are difficult to be calculated at the same time in the numerical calculation.

A New Growth Kinetics in Simulation of Dendrite Growth by Cellular Automaton Method

2007 ◽  
Vol 26-28 ◽  
pp. 957-962 ◽  
Author(s):  
Bo Wei Shan ◽  
Xin Lin ◽  
Lei Wei ◽  
Wei Dong Huang
Keyword(s):  
Cellular Automaton ◽  
Growth Kinetics ◽  
Solute Concentration ◽  
Dendrite Growth ◽  
Liquid Interface ◽  
Interface Temperature ◽  
Algebraic Equations ◽  
Interface Growth ◽  
Solid Liquid Interface ◽  
Solid Liquid

A modified cellular automaton model was proposed to simulate the dendrite growth of alloy. Different from previous models, this model used neither an analytical equation(such as KGT model) nor an interface solute gradient equation to solve the velocity of solid-liquid interface, but used the interface solute and energy conservation and thermodynamic equilibrium condition to describe the solid/liquid interface growth kinetics process. In present model, once the temperature field and solute field were solved by finite different method in the entire domain, the material thermodynamic properties can be substituted into four algebraic equations to easily determine the variation of solid fraction, interface temperature and solute concentration, instead of calculating interface moving velocity. As a result, the complexity of the calculation can be largely reduced. The simulated dendrite growth was in a good agreement with the Lipton–Glicksman–Kurz (LGK) model for free dendritic growth in undercooled melts.

The Cooling Time of Gas Assisted Injection Molding

2011 ◽  
Vol 221 ◽  
pp. 422-428
Author(s):  
Qiu Xiang Bu ◽  
Xiao Zhang ◽  
Hai Ying Chen ◽  
Qing Zhen Yin
Keyword(s):  
Mathematical Model ◽  
Injection Molding ◽  
Wall Thickness ◽  
Cooling Time ◽  
Cooling Process ◽  
Liquid Phases ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
The Mathematical Model ◽  
Plastic Products

The mathematical model of solid-liquid interface is obtained by making an idealized hypothesis for parameters of the cooling process in gas-assisted injection molding, and simplifying the mathematical model. And then the cooling time of plastic products in the process is obtained by using two ways of solving the solid and liquid phases. And verified by example the conclusions that some plastic products of gas-assisted injection molding, when the materials and workmanship conditions are constant, cooling time of the airway is proportional to the square of the wall thickness is obtained.

Investigation on the Morphological Instability during Directional Solidification of a Transparent Alloy during Sounding Rocket Flights

2006 ◽  
Vol 508 ◽  
pp. 463-472 ◽  
Author(s):  
A. Weiß ◽  
Laszlo Sturz ◽  
Gerhard Zimmermann
Keyword(s):  
Directional Solidification ◽  
Solidification Front ◽  
Critical Time ◽  
Sounding Rocket ◽  
Primary Spacing ◽  
Morphological Instability ◽  
Interface Growth ◽  
Characteristic Features ◽  
Solid Liquid Interface ◽  
Solid Liquid

The movement and morphological change of a solid-liquid interface in directional solidification was investigated during two sounding rocket flights. By using the transparent binary alloy Succinonitrile-Acetone the dynamic processes at the solidification front could be observed directly. Both the planar interface growth, the onset of instability and the characteristic features of the interface morphology, i.e. the evolution of the primary spacing and amplitudes of the cells and dendrites were evaluated. The comparison with a calculation of the morphological instability based on the theoretical model of Warren and Langer showed a good agreement concerning the critical time and velocity of the solidification front.

scholarly journals Temperature-mediated tribological characteristics of 40CrNiMoA steel and Inconel 718 alloy during sliding against Si3N4 counterparts

Friction ◽  
2020 ◽  
Author(s):  
Liuyang Bai ◽  
Shanhong Wan ◽  
Gewen Yi ◽  
Yu Shan ◽  
Sang The Pham ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Friction And Wear ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Effect Of Temperature ◽  
Large Temperature ◽  
Structural Adaptation ◽  
Temperature Dependent ◽  
Inconel 718 Alloy ◽  
Ambient Temperatures

AbstractA comparative evaluation of the friction and wear behaviors of 40CrNiMoA steel and Inconel 718 alloy sliding against Si3N4 counterparts was conducted over a large temperature range from room temperature (RT) to 800 °C. The temperature-dependent tribological properties associated with the resulting chemical mitigation and structural adaptation of the solid sliding surface were clarified by surface/interface characterizations. The results revealed desirable performance in reducing friction and wear at elevated temperatures, which was associated with the resulting oxide composite film’s adaptive lubricating capability, whereas severe abrasive wear occurred at room/ambient temperatures. The oxidative-abrasive differentials for the two alloys were further discussed by considering the combined effect of temperature and stressed-shearing conditions.

Nonequilibrium Kinetics of Phase Boundary Movement in Cellular Automaton Modelling

2006 ◽  
Vol 508 ◽  
pp. 405-410 ◽  
Author(s):  
Andriy A. Burbelko ◽  
Edward Fraś ◽  
Wojciech Kapturkiewicz ◽  
Ewa Olejnik
Keyword(s):  
Cellular Automaton ◽  
Nonequilibrium Kinetics ◽  
Equilibrium Level ◽  
Kinetic Undercooling ◽  
Kinetic Diffusion ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Kinetics Of ◽  
Meso Scale ◽  
Non Equilibrium

A mathematical crystallization model in the meso scale (the intermediate dimension scale between interatomic distance in solids and grain size in metals and alloys) is presented with the use of a kinetic-diffusion cellular automaton model. The model considers the non-equilibrium character of real processes of phase transformations, where the kinetic undercooling of the solid-liquid interface is a measure of this non-equilibrium level. Anisotropy of the interface mobility is assumed. The modelling results are compared to the experimental data.

Atom-probe analysis of the solid-liquid interface

1995 ◽  
Vol 53 ◽  
pp. 676-677
Author(s):  
J.A. Panitz
Keyword(s):  
Molecular Level ◽  
Selective Adsorption ◽  
Electronic Devices ◽  
Atom Probe ◽  
Chemical Agent ◽  
Hostile Environment ◽  
Solid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Chemically Selective

The first few atomic layers of a solid can form a barrier between its interior and an often hostile environment. Although adsorption at the vacuum-solid interface has been studied in great detail, little is known about adsorption at the liquid-solid interface. Adsorption at a liquid-solid interface is of intrinsic interest, and is of technological importance because it provides a way to coat a surface with monolayer or multilayer structures. A pinhole free monolayer (with a reasonable dielectric constant) could lead to the development of nanoscale capacitors with unique characteristics and lithographic resists that surpass the resolution of their conventional counterparts. Chemically selective adsorption is of particular interest because it can be used to passivate a surface from external modification or change the wear and the lubrication properties of a surface to reflect new and useful properties. Immunochemical adsorption could be used to fabricate novel molecular electronic devices or to construct small, “smart”, unobtrusive sensors with the potential to detect a wide variety of preselected species at the molecular level. These might include a particular carcinogen in the environment, a specific type of explosive, a chemical agent, a virus, or even a tumor in the human body.

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