TiC颗粒对铸态球墨铸铁组织和力学性能的影响

doi:10.13229/j.cnki.jdxbgxb20181037

Abstract

Abstract:

TiC powder was modified by high-energy ball milling and added to the melt of nodular cast iron. The tissues were analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that both graphite and matrix of the ductile iron are improved. As the heterogeneous nucleation core of graphite, some TiC particles promote the nucleation of graphite, increase the number of graphite spheres by 40.5%, refine the size of graphite spheres, indirectly increase the ferrite content by 4.5%, and increase the spheroidization rate by 9.1%. On the one hand, the morphology of the surrounding cementite is changed, and even the unique “pearlite colony” structure can be formed. On the other hand, the ferrite grain is refined due to the hindrance of TiC particles to grain boundary movement. The mechanical properties of the as-cast ductile iron were tested by tensile test machine and impact test machine. The total elongation, impact toughness at room temperature and impact toughness at low temperature (－20 °C) were increased by 19.1%, 31.1% and 21.8% respectively by adding a small amount of TiC particles.

Key words: metallic materials, as cast ductile iron, TiC, plasticity, impact toughnes

CLC Number:

TG143.5

Jin-guo WANG,Shuai REN,Rui-fang YAN,Kai HUANG,Zhi-qiang WANG. Effect of TiC particles on microstructure and mechanical properties of as cast ductile iron[J].Journal of Jilin University(Engineering and Technology Edition), 2019, 49(6): 2010-2018.

Figures/Tables 9

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试样	C	Si	Mn	P	S	Ti	Mg	Ce
a	3.03	2.40	0.52	0.006	0.008	0.006	0.041	0.029
b	3.03	2.37	0.51	0.006	0.008	0.022	0.042	0.027

Effect of TiC particles on microstructure and mechanical properties of as cast ductile iron

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