球墨铸铁壳体球化衰退的原因分析及防止措施  

Analysis and Prevention Measures of Nodulization Degeneration on Nodular Iron Shells

作　　者：谭宏俊 陈孝先 TAN Hong-jun;CHEN Xiao-xian(Sichuan Sharing Casting Co.,Ltd.,Ziyang 641300,China)

机构地区：[1]四川共享铸造有限公司,四川资阳641300

出　　处：《现代铸铁》2024年第4期52-54,60,共4页Modern Cast Iron

摘　　要：介绍了球墨铸铁壳体铸件的结构及原生产工艺,详细阐述了铸件出现的金相组织和力学性能不合格的问题。通过铸件实物分析,确定其产生的原因是球化衰退,并从孕育处理、浇注温度及浇注时间方面进行原因分析,提出了防止球化衰退的措施:(1)加强孕育控制,增加浇注随流孕育;(2)将球化处理温度控制在1450~1480℃;(3)孕育后到浇注完成的时间控制在10 min以内。经过生产验证,石墨球状完整,球化衰退问题得到解决,力学性能满足技术要求。The structure and original production process of nodular iron shell castings were introduced.The issues of inadeq-uate metallurgical structure and mechanical performance of the castings were elaborating in detail.Through physical analysis of the castings,the cause of these issues was identified as nodularization degeneration.Reasons were analyzed from the aspects of inoculation treatment,pouring temperature,and pouring time.Measures to prevent nodularization degeneration were proposed:(1)Strengthening inoculation control and increasing pouring with flow inoculation.(2)Controlling nodularization treatment temperature within the range of 1450~1480°C.(3)Controlling the time from inoculation to completion of pouring within 10 minutes.After production validation,complete graphite nodules were achieved,resolving the issue of nodularization degeneration,and meeting the technical requirements for mechanical performance.

关 键 词：球墨铸铁 壳体 球化衰退 

分 类 号：TG255[金属学及工艺—铸造]