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

摘要/Abstract

摘要：

采用高能球磨方法对TiC粉末进行改性，并加入到球墨铸铁熔体。使用光镜、扫描电镜、能谱仪对其组织进行分析。结果表明，球墨铸铁的石墨和基体组织均得到改善。一部分TiC颗粒作为石墨异质核心，促进了石墨形核，使石墨球数目增加40.5%，石墨球尺寸细化，铁素体含量升高了4.5%，球化率提高了9.1%。另一部分进入基体的TiC颗粒，不仅改变了周围的渗碳体形貌，甚至形成独特的“珠光体团”结构；而且能阻碍晶界运动进而细化铁素体晶粒。采用拉伸试验机和冲击试验机对铸态球墨铸铁进行力学性能测试，结果表明，外加少量TiC颗粒使球墨铸铁的断裂总伸长率提高了19.1%，室温冲击韧性提高了31.1%，低温（-20 ℃）冲击韧性提高了21.8%。

关键词: 金属材料, 铸态球墨铸铁, TiC颗粒, 塑性, 冲击韧性

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

中图分类号:

TG143.5

王金国,任帅,闫瑞芳,黄恺,王志强. TiC颗粒对铸态球墨铸铁组织和力学性能的影响[J]. 吉林大学学报(工学版), 2019, 49(6): 2010-2018.

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.

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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