TY - JOUR
T1 - Numerical simulation of titanium alloy ingot solidification structure during VAR process based on three-dimensional CAFE method
AU - Kou, Hongchao
AU - Zhang, Yingjuan
AU - Li, Pengfei
AU - Zhong, Hong
AU - Hu, Rui
AU - Li, Jinshan
AU - Zhou, Lian
N1 - Publisher Copyright:
Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved
PY - 2014/7/1
Y1 - 2014/7/1
N2 - A multiscale three-dimensional (3D) mathematical model has been established for simulating the temperature field, the fluid flow and the solidification structure of Ti-6Al-4V alloy ingot during vacuum arc remelting (VAR) process, which consists of the macroscopic mass, the momentum and energy conservation equations and the macroscale model of the nucleation and growth of grains. On the basis of heat transfer and fluid flow calculation, the 3D solidification structure formation of the ingot during whole VAR process has been obtained. Comparing the simulation result with the experimental observation, a reasonably qualitative agreement is achieved on grain structure and grain growth pattern. In particular, when taking the heat radiation into consideration during the calculation, the columnar grains on the ingot top are predicted well. Furthermore, a sensitivity study of the effect of natural convection on the grain structure has been carried out. The results show that the natural convection has a great influence on columnar-to-equiaxed transition (CET) and grain size, expressing as promoting the CET and refining the grain.
AB - A multiscale three-dimensional (3D) mathematical model has been established for simulating the temperature field, the fluid flow and the solidification structure of Ti-6Al-4V alloy ingot during vacuum arc remelting (VAR) process, which consists of the macroscopic mass, the momentum and energy conservation equations and the macroscale model of the nucleation and growth of grains. On the basis of heat transfer and fluid flow calculation, the 3D solidification structure formation of the ingot during whole VAR process has been obtained. Comparing the simulation result with the experimental observation, a reasonably qualitative agreement is achieved on grain structure and grain growth pattern. In particular, when taking the heat radiation into consideration during the calculation, the columnar grains on the ingot top are predicted well. Furthermore, a sensitivity study of the effect of natural convection on the grain structure has been carried out. The results show that the natural convection has a great influence on columnar-to-equiaxed transition (CET) and grain size, expressing as promoting the CET and refining the grain.
KW - Natural convection
KW - Solidification structure
KW - Temperature field
KW - Titanium
KW - Vacuum arc remelting (VAR)
UR - http://www.scopus.com/inward/record.url?scp=84906827395&partnerID=8YFLogxK
U2 - 10.1016/s1875-5372(14)60120-x
DO - 10.1016/s1875-5372(14)60120-x
M3 - 文章
AN - SCOPUS:84906827395
SN - 1002-185X
VL - 43
SP - 1537
EP - 1542
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 7
ER -