Scalable, continuous variable, cellular automaton model for grain growth during homogenisation of vacuum arc remelted Inconel* 718

2003 ◽  
Vol 19 (7) ◽  
pp. 859-865 ◽  
Author(s):  
A. Kermanpur ◽  
W. Wang ◽  
P. D. Lee ◽  
M. McLean
Keyword(s):  
Cellular Automaton ◽  
Grain Growth ◽  
Inconel 718 ◽  
Continuous Variable ◽  
Cellular Automaton Model ◽  
Vacuum Arc

A parallelized three-dimensional cellular automaton model for grain growth during additive manufacturing

2018 ◽  
Vol 61 (5) ◽  
pp. 543-558 ◽  
Author(s):  
Yanping Lian ◽  
Stephen Lin ◽  
Wentao Yan ◽  
Wing Kam Liu ◽  
Gregory J. Wagner
Keyword(s):  
Additive Manufacturing ◽  
Cellular Automaton ◽  
Grain Growth ◽  
Three Dimensional ◽  
Cellular Automaton Model

Modeling austenite–ferrite transformation in low carbon steel using the cellular automaton method

2004 ◽  
Vol 19 (10) ◽  
pp. 2877-2886 ◽  
Author(s):  
Y.J. Lan ◽  
D.Z. Li ◽  
Y.Y. Li
Keyword(s):  
Carbon Steel ◽  
Cellular Automaton ◽  
Grain Boundaries ◽  
Grain Growth ◽  
Low Carbon Steel ◽  
Carbon Diffusion ◽  
Cellular Automaton Model ◽  
Low Carbon ◽  
Austenite Grain ◽  
Ferrite Transformation

Austenite–ferrite transformation at different isothermal temperatures in low carbon steel was investigated by a two-dimensional cellular automaton approach, which provides a simple solution for the difficult moving boundary problem that governs the ferrite grain growth. In this paper, a classical model for ferrite nucleation at austenite grain boundaries is adopted, and the kinetics of ferrite grain growth is numerically resolved by coupling carbon diffusion process in austenite and austenite–ferrite (γ–α) interface dynamics. The simulated morphology of ferrite grains shows that the γ–α interface is stable. In this cellular automaton model, the γ–α interface mobility and carbon diffusion rate at austenite grain boundaries are assumed to be higher than those in austenite grain interiors. This has influence on the morphology of ferrite grains. Finally, the modeled ferrite transformation kinetics at different isothermal temperatures is compared with the experiments in the literature and the grid size effects of simulated results are investigated by changing the cell length of cellular automaton model in a set of calculations.

scholarly journals Three-Dimensional Cellular Automata Simulation of the Austenitizing Process in GCr15 Bearing Steel

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3022
Author(s):  
Fuyong Su ◽  
Wenli Liu ◽  
Zhi Wen
Keyword(s):  
Cellular Automaton ◽  
Grain Growth ◽  
Three Dimensional ◽  
Bearing Steel ◽  
Cellular Automaton Model ◽  
Gcr15 Steel ◽  
Processing Times ◽  
Gcr15 Bearing Steel ◽  
Different Temperatures ◽  
Simulation Results

On the basis of the two-dimensional cellular automaton model, a three-dimensional cellular automaton model of austenitizing process was established. By considering the orientation of pearlite layer and the direction of austenite grain growth, the velocity of the interface was calculated during the austenitizing process. The austenitizing process of GCr15 steel was simulated, and the anisotropy of grain growth rate during austenitization was demonstrated by simulation results. By comparing the simulation results with the experimental data, it was found that the calculated results of the three-dimensional cellular automaton model established in this paper were in good agreement with the experimental results. By using this model, the three-dimensional austenitizing process of GCr15 steel at different temperatures and under different processing times can be analyzed, and the degree of austenitization can be predicted.

scholarly journals Induction Brazing for Rapid Localized Repair of Inconel 718

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1096
Author(s):  
Aprilia Aprilia ◽  
Jin Lee Tan ◽  
Yongjing Yang ◽  
Sung Chyn Tan ◽  
Wei Zhou
Keyword(s):  
Adverse Effects ◽  
Grain Growth ◽  
Inconel 718 ◽  
Vacuum Furnace ◽  
Slow Process ◽  
Prolonged Heating ◽  
Induction Brazing ◽  
Heating And Cooling ◽  
Short Period ◽  
Different Temperatures

Vacuum furnace has been used for brazing repair of aerospace components, but it is a slow process which typically takes a few hours. The prolonged heating and cooling cycles could cause some adverse effects on the components such as excessive grain growth. A rapid brazing technique using induction coil was studied to evaluate its suitability for localized repair. Induction brazing of Inconel 718 was carried out using AMS 4777 brazing paste at different temperatures (950 °C, 1050 °C and 1150 °C ) for various durations (2 min, 10 min and 20 min). Microstructure and microhardness were evaluated. The experimental results show that brazing at 1050 °C leads to desirable microstructures in a short period of merely 2 min. The study demonstrates the potential application of induction brazing for rapid localized aerospace repair.

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