Open AccessCellular automaton modelling of M7C3 carbide growth during solidification of Fe-C-Cr alloy
Author(s) -
H W Zhang,
S Zhang,
Y C Wang,
Yawei Hao,
Mengyu Miao,
Keiji Nakajima,
Hong Lei,
Q Wang,
Jinguang He
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/861/1/012046
Subject(s) - carbide , materials science , supercooling , austenite , alloy , grain growth , metallurgy , precipitation , ternary operation , diffusion , grain size , thermodynamics , microstructure , physics , meteorology , computer science , programming language
A microscopic cellular automaton combined with macroscopic heat and solute transport was developed to simulate the mutual growth and evolution of austenite and M 7 C 3 carbide grains during Fe-C-Cr ternary alloy solidification process. The diffusion of solute C and Cr are contributed together to the constitutional undercooling, together with curvature undercooling, for obtaining the grain growth rate of austenite and M 7 C 3 carbide. Results show that, the absorption of solute C and Cr by M 7 C 3 grain and rejection by austenite grain promote the two grains’ cooperative growth. Once they approach to each other, the austenite grain quickly overgrows towards the M 7 C 3 grain till finally envelops it. The simulated solidification morphology of the Fe-4wt%C-17wt%Cr alloy, predicted averaged grain size of M 7 C 3 carbides and C and Cr concentration in austenite grains agree with the experimental measurements and solidification path prediction. The predicted average liquid concentration curve fits with the LR, GS and PE prediction at the initial M 7 C 3 precipitation regime and after austenite grains fully enveloping towards the M 7 C 3 grains, returns to overlap the LR, GS and PE prediction curves.