TY - JOUR
T1 - A numerical study of dendrite growth and microstructure transition in a non-equilibrium solidification
AU - Ao, Xiaohuia
AU - Xia, Huanxiong
AU - Liu, Jianhua
AU - He, Qiyang
AU - Lin, Shengxiang
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2021/6/9
Y1 - 2021/6/9
N2 - Controlling the thermal condition of a solidification process to obtain a desirable microstructure morphology and then prepare specific materials with excellent mechanical properties or special functions has been attracting many concerns, where the behavior of microstructure morphology transition, especially the columnar-to-equiaxed transition, is one of the most important fundamental issues. This paper introduced a kinetic model for dendrite growth with a large undercooling during a non-equilibrium solidification process using cellular automaton, in which the local thermodynamic equilibrium condition, non-equilibrium partitioned solute, curvature and interface energy anisotropy were considered. The growth rate of dendrite tip was numerically investigated by using the cellular automaton model, and the effects of temperature gradient and cooling rate on the growth rate and morphology features were found. By integrating the simulation results and analytical models, a new microstructure morphology transition criterion for the non-equilibrium solidification depending on the temperature gradient and cooling rate was proposed, in which both the planar-to-columnar and the columnar-to-equiaxed transition were presented.
AB - Controlling the thermal condition of a solidification process to obtain a desirable microstructure morphology and then prepare specific materials with excellent mechanical properties or special functions has been attracting many concerns, where the behavior of microstructure morphology transition, especially the columnar-to-equiaxed transition, is one of the most important fundamental issues. This paper introduced a kinetic model for dendrite growth with a large undercooling during a non-equilibrium solidification process using cellular automaton, in which the local thermodynamic equilibrium condition, non-equilibrium partitioned solute, curvature and interface energy anisotropy were considered. The growth rate of dendrite tip was numerically investigated by using the cellular automaton model, and the effects of temperature gradient and cooling rate on the growth rate and morphology features were found. By integrating the simulation results and analytical models, a new microstructure morphology transition criterion for the non-equilibrium solidification depending on the temperature gradient and cooling rate was proposed, in which both the planar-to-columnar and the columnar-to-equiaxed transition were presented.
UR - http://www.scopus.com/inward/record.url?scp=85111556704&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1939/1/012018
DO - 10.1088/1742-6596/1939/1/012018
M3 - Conference article
AN - SCOPUS:85111556704
SN - 1742-6588
VL - 1939
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012018
T2 - 2021 International Conference on Mechanical Engineering, Intelligent Manufacturing and Automation Technology, MEMAT 2021
Y2 - 23 April 2021 through 25 April 2021
ER -