Influence of Semi-Solid Isothermal Heat Treatment on Microstructure and Mechanical Properties of Ductile Cast Iron
Influence of Semi-Solid Isothermal Heat Treatment on Microstructure and Mechanical Properties of Ductile Cast Iron
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半固态等温热处理对球墨铸铁显微组织和力学性能的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
N. Fathy
中科院分区：
文献类型：
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作者：
M. Ramadan;N. Fathy
本研究研究了半固态等温热处理对球墨铸铁（DI）显微组织、硬度和冲击韧性的影响。热处理空冷球墨铸铁呈现球状石墨、渗碳体和细小的珠光体基体组织。在加热时间的早期阶段（最多 20 分钟），DI 的石墨量显着减少，渗碳体量显着增加。通过增加加热时间（超过 20 分钟），DI 中石墨含量略有减少，渗碳体含量略有增加。硬度值随着加热时间的增加而增加。同时，冲击韧性随着加热时间的增加而降低。在1165℃、加热时间10~15min范围内可达到合理组织和力学性能的最佳热处理条件。
In this research, the effect of semi-solid isothermal heat treatment on microstructure, hardness and impact toughness of ductile iron (DI) is studied. Heat-treated air-cooled ductile iron shows spheroid graphite, cementite and fine pearlite matrix structure. At the early stages of heating time (up to 20 min), the DIs show significant decrease in amounts of graphite and significant increase in amounts of cementite. By increasing heating time, above 20 min, the DIs show slightly decrease in amounts of graphite and slightly increase in amounts of cementite. Hardness values increase by increasing heating time. Meanwhile, the impact toughness decrease with increasing heating time. The optimum heating treatment condition for reasonable structure and mechanical properties could be achieved at the temperature of 1165℃ for the heating time range of 10 to 15 min.