NDLI: A Coupled Cellular Automaton–Finite-Element Mathematical Model for the Multiscale Phenomena of Electroslag Remelting H13 Die Steel Ingot

Content Provider	Springer Nature Link
Author	Li, Baokuan Wang, Qiang Wang, Fang Chen, Mingqiu
Copyright Year	2014
Abstract	A coupled cellular automaton–finite-element mathematical model has been developed to investigate the multiscale phenomena of the electroslag remelting (ESR) H13 steel ingot. The heat transfer equation is solved to obtain the temperature distribution and liquid metal pool profile by a coarser finite-element (FE) mesh. Then, a regular network of square cells with a much finer scale is drawn for the simulation of microstructure with the cellular automaton (CA) technique. The continuous nucleation, which is based on the Gaussian distribution, is implemented to describe the heterogeneous nucleation. The growth kinetics of the dendritic tip is taken into account by the Kure–Giovanola–Trivedi model. At each time step, the temperature at the CA cell locations is interpolated from the temperature at four adjacent FE elements. The solute transfer is calculated using the FE method. Moreover, the evolution of the multiscale phenomena with growing of the ingot is considered by the varying boundary conditions. A reasonable agreement is demonstrated between the calculation and experiment. The results indicate that the shallow U-shaped metal pool would change to the deep V-shaped metal pool with the growing of the ingot. The vertical columnar grains appear at the bottom of the ingot, and an inverse V-shaped grain structure can be observed at the upper part of the ingot. It can be inferred that improving the undercooling can refine the microstructure and motivate the growing of the columnar grain during the ESR process.
Starting Page	1153
Ending Page	1165
Page Count	13
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	66
Issue Number	7
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2014-05-21
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Chemistry/Food Science Physics Environment Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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