元胞自动机-有限元法模拟碳当量元素对亚共晶球墨铸铁流动性的影响

doi:10.13229/j.cnki.jdxbgxb20190607

Abstract

Abstract:

The parameter system of the Cellular Automata Finite Element method （CAFE） for simulating ductile iron grain structure was optimized. Based on a large number of preliminary experiments， the surface nucleation parameters and the nucleus parameters of the eutectic grains were optimized. The flow length of the spheroidal graphite spiral samples with various carbon and silicon contents and the solidification structure at the tip of the stream were simulated. In the verification test， the grain boundary model was realized by the constitutive algorithm for the inconspicuous ductile iron eutectic grains. The flow length of the obtained spiral sample and Voronoi grain distribution map were compared with the simulation results. It was shown that after the carbonization or silicon enhancement treatment， the crystal grains at the end of the spiral sample stream were refined in the hypoeutectic ductile iron sample， and the fluidity of the sample was improved. Moreover， the simulation results are in good agreement with the experimental verification results， and the method for evaluating the fluidity by numerical simulation is established.

Key words: metal material, hypoeutectic ductile iron, cellular automata finite element method（CAFE） method, carbon equivalent element, alloy fluidity, network algorithm, grain refinement

CLC Number:

TG143.5

Jin-guo WANG,Kai HUANG,Rui-fang YAN,Shuai REN,Zhi-qiang WANG,Jin GUO. Effect of carbon equivalent elements on fluidity of hypoeutectic ductile iron by cellular automata finite element method[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(3): 855-865.

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编号	w(C)	w(Si)	w(Mn)	w(Cu)	w(Ni)
A1	2.8	2.85	0.2	0.6	0.65
A2	3.1	2.85	0.2	0.6	0.65
A2	3.4	2.85	0.2	0.6	0.65
B1	3.1	2.55	0.2	0.6	0.65
B2	3.1	2.85	0.2	0.6	0.65
B3	3.1	3.15	0.2	0.6	0.65

编号	质量分数/%	T_l/K	T_s/K	a₂/m	a₃/m
A1	2.8	1278	1166	3.46×10^-8	3.61×10^-9
A2	3.1	1252	1169	3.01×10^-8	3.02×10^-9
A3	3.4	1227	1168	2.64×10^-8	2.55×10^-9

编号	质量分数/%	T_l/K	T_s/K	a₂/m	a₃/m
B1	2.55	1255	1166	3.02×10^-8	3.03×10^-9
B2	2.85	1252	1169	3.01×10^-8	3.02×10^-9
B3	3.15	1248	1171	2.99×10^-8	2.99×10^-9

参数	A1	A2	A3
晶粒数量	14 343	17 752	21 238
晶粒平均直径/μm	63.73	57.39	51.06

参数	A1	A2	A3
晶粒数量	6843	8517	14 896
晶粒平均直径/μm	69.94	58.80	41.84

Effect of carbon equivalent elements on fluidity of hypoeutectic ductile iron by cellular automata finite element method

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