Shouquan Du, Chaoyang Chen, Ruirun Chen, Qi Wang, Xiangyin Cui, Qiang Song
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The interlayer spacing of pearlite in matrix decreased with the increase of cooling rate, four different mold casting of cast iron material sample of pearlite lamellar spacing is CO<sub>2</sub> sodium silicate bonded sand mold, 340 nm, oxide ceramic mold, 275 nm, cast iron mold, 141 nm, graphite casting mold, 135 nm, respectively. The reduction of the interlayer spacing of pearlite also significantly improves the tensile strength, compressive strength and hardness. The tensile strength of cast iron specimens cast in graphite casting molds is the highest, at 421 MPa, while the tensile strength of cast iron specimens cast in CO<sub>2</sub> sodium silicate bonded sand molds is the lowest, at 346 MPa. The graphite cast iron sample has the highest compressive strength of 2165 MPa, and the oxide ceramic cast iron sample has the lowest compressive strength of 1115 MPa. The Brinell hardness of the samples cast in cast iron molds is the highest, at 409 HB, while the samples cast in CO<sub>2</sub> sodium silicate bonded sand molds have the lowest Brinell hardness, at 255 HB. In addition, increasing the cooling rate inhibited the diffusion of elements in the melt, reduced the final solidification interval and also reduced the shrinkage porosity and other defects. Fracture analysis shows that cleavage fracture is the main fracture mode of castings. 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引用次数: 0
摘要
本文采用四种不同的铸造材料得到灰铸铁试样,研究了不同铸造材料引起的不同冷却速度对石墨分布、基体结构和力学性能的影响。实验结果表明,随着冷却速度的增加,灰口铸铁的石墨形态由粗大的片状 A 型石墨转变为莲座状 B 型石墨,石墨数量增加,分布更加均匀。珠光体在基体中的层间距随冷却速度的增加而减小,四种不同模具铸造的铸铁材料样品的珠光体层间距分别为 CO2 硅酸钠结合砂模具、340 nm,氧化物陶瓷模具、275 nm,铸铁模具、141 nm,石墨铸造模具、135 nm。减小珠光体的层间距还能显著提高抗拉强度、抗压强度和硬度。用石墨铸模浇铸的铸铁试样抗拉强度最高,为 421 兆帕,而用二氧化碳硅酸钠结合砂铸模浇铸的铸铁试样抗拉强度最低,为 346 兆帕。石墨铸铁试样的抗压强度最高,为 2165 兆帕,氧化物陶瓷铸铁试样的抗压强度最低,为 1115 兆帕。用铸铁模具浇铸的试样的布氏硬度最高,为 409 HB,而用二氧化碳硅酸钠结合砂模具浇铸的试样的布氏硬度最低,为 255 HB。此外,提高冷却速度抑制了熔体中元素的扩散,缩短了最终凝固间隔,也减少了收缩气孔和其他缺陷。断裂分析表明,劈裂断裂是铸件的主要断裂模式。冷却速度越高,断口形态越平滑。
Influence of Casting Materials on the Microstructure and Mechanical Properties of Gray Cast Iron for Cylinder Liners
In this paper, four different casting materials were used to get gray cast iron samples, the effects of different cooling rates caused by different casting materials on graphite distribution, matrix structure and mechanical properties were investigated. The experimental results show that as the cooling rate increases, the graphite form of gray cast iron changed from coarse flake A-type graphite to rosette shaped B-type graphite, graphite increased in quantity and was more evenly distributed. The interlayer spacing of pearlite in matrix decreased with the increase of cooling rate, four different mold casting of cast iron material sample of pearlite lamellar spacing is CO2 sodium silicate bonded sand mold, 340 nm, oxide ceramic mold, 275 nm, cast iron mold, 141 nm, graphite casting mold, 135 nm, respectively. The reduction of the interlayer spacing of pearlite also significantly improves the tensile strength, compressive strength and hardness. The tensile strength of cast iron specimens cast in graphite casting molds is the highest, at 421 MPa, while the tensile strength of cast iron specimens cast in CO2 sodium silicate bonded sand molds is the lowest, at 346 MPa. The graphite cast iron sample has the highest compressive strength of 2165 MPa, and the oxide ceramic cast iron sample has the lowest compressive strength of 1115 MPa. The Brinell hardness of the samples cast in cast iron molds is the highest, at 409 HB, while the samples cast in CO2 sodium silicate bonded sand molds have the lowest Brinell hardness, at 255 HB. In addition, increasing the cooling rate inhibited the diffusion of elements in the melt, reduced the final solidification interval and also reduced the shrinkage porosity and other defects. Fracture analysis shows that cleavage fracture is the main fracture mode of castings. The higher the cooling rate, the smoother the fracture morphology.
期刊介绍:
The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).