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通过对蠕墨铸铁即紧密石墨铸铁 ( CGI)的微观组织、石墨形态、疲劳破坏机理的分析及在高温下的强度和应变的试验 ,说明了这种铸铁具有良好的疲劳可靠性和高温强度。概述了国外开发成功的新特 ( Sinter)铸造工艺的特点和原理。这种铸造方法采用配有微机的工艺控制器 ,通过对铁水成分的热分析和二次蠕化处理 ,可精确控制蠕化剂和孕育剂的添加量 ,从而生产出高强度、高质量蠕墨铸铁。介绍了日本大发金属公司研究开发成功的蠕墨铸铁柴油机气缸盖和机体的铸造工艺。采用该工艺浇注的柴油机部件 ,其强度指标可与球墨铸铁相媲美。
The results show that the cast iron has good fatigue reliability and high temperature strength by analyzing the microstructure of compacted graphite cast iron (CGI), graphite morphology, fatigue failure mechanism and the test of strength and strain at high temperature. The features and principles of the Sinter casting process successfully developed abroad are summarized. This casting method uses a microprocessor-based process controller, through the thermal analysis of hot metal components and secondary vermiculite processing, precise control of the addition of vermiculite and inoculant to produce high-strength, high-quality vermicular graphite cast iron. The casting technology of cylinder head and body of vermicular cast iron diesel engine successfully researched and developed by Japan Daihatsu Metal Co., Ltd. was introduced. Diesel engine components cast by this process have comparable strength indicators to ductile iron.