CA MODELING OF PHASE TRANSFORMATION IN ASTM A216 WCA CAST STEEL DURING SOLIDIFICATION AND COOLING PROCESS
SU Bin1), HAN Zhiqiang1), ZHAO Yongrang2), SHEN Bingzhen2), ZHANG Lianzhen2), LIU Baicheng1)
1) Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2) CITIC Heavy Industries Co., Ltd., Luoyang 471039
Cite this article:
SU Bin HAN Zhiqiang ZHAO Yongrang SHEN Bingzhen ZHANG Lianzhen LIU Baicheng. CA MODELING OF PHASE TRANSFORMATION IN ASTM A216 WCA CAST STEEL DURING SOLIDIFICATION AND COOLING PROCESS. Acta Metall Sin, 2011, 47(11): 1388-1395.
Abstract A cellular automaton (CA) model has been developed to simulate the microstructure
evolution of ASTM A216 WCA cast steel during solidification and consequent cooling process. In the
model, the thermodynamics and solute diffusion of the multicomponent system were taken into account
by using Thermo-Calc and Dictra software. The peritectic solidification, α-ferrite/austenite transition and
eutectoid transformation as well as the final microstructure can be predicted. To validate the model, a sand
mold step-shaped casting was produced and metallographic examination was carried out, in which the
content and the grain size of proeutectoid ferrite were measured by using OM, and the
mean interlamellar spacing of pearlite was measured by using SEM. It was shown that the simulated
results are in good agreement with the experimental results. As the cooling rate increases,
proeutectoid α-ferrite content increased, while the mean grain size of proeutectoid α-ferrite
and the average lamellar spacing of pearlite decreased.
Received: 12 May 2011
Fund:
Supported by National Science and Technology Major Project (No.2011ZX04014-052)
