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设计了一种新型含碳化物马氏体球墨铸铁材料,并对该材料进行了不同奥氏体化温度的热处理。结果表明:经不同温度奥氏体化后,新型铸铁的组织均为细针状马氏体+孤立分布的硼-铬碳化物+球状石墨组织。奥氏体化温度在820~890℃范围变化时,随奥氏体化温度的升高,该铸铁的硬度增大,冲击韧度减小;奥氏体化温度高于890℃时,硬度和冲击韧度均减小。奥氏体化温度为890℃时,试验铸铁硬度和冲击性能达到良好的匹配。
A new type of martensite ductile cast iron with carbide was designed and the material was heat treated at different austenitizing temperatures. The results show that the microstructure of the new cast iron is fine needle-shaped martensite + isolated boron-chromium carbide + spheroidal graphite after austenitization at different temperatures. When the austenitizing temperature is in the range of 820 ~ 890 ℃, the hardness of the cast iron increases with the increase of the austenitizing temperature and the impact toughness decreases. When the austenitizing temperature is higher than 890 ℃, the hardness and Impact toughness are reduced. When the austenitizing temperature is 890 ℃, the test cast iron hardness and impact performance to achieve a good match.