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中小型船用柴油机预埋主润滑油管道溶蚀机理探讨
Study on Dissolving Erosion Mechanism of Pre-embedded Main lubrication Oil Pipeline during Casting for Small-to-medium Sized Marine Diesel Engine Block
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- DOI:
- 作者:
- 孙常奋
SUN Changfen
- 作者单位:
- 沪东重机有限公司综合技术所
Comprehensive Technology Research Institute of Hudong Heavy Machinery Co.,Ltd.,Shanghai 200129,China
- 关键词:
- 预埋钢管 浇铸液 共晶线 剥蚀
pre-embedded pipe casting fluid eutectic line detaching
- 摘要:
- 中小型船用柴油机机体主滑油预埋钢管在球墨铸铁机体浇铸过程中,钢管受热温度过高,极易溶蚀。通过测定浇铸过程中钢管及近钢管浇铸液温度变化,探讨了钢管在表面无防护状态下溶蚀机理。结果表明,当钢管升温至600℃以上时,碳开始从浇铸液向钢管基体晶界渗透,在晶粒表面形成渗碳体Fe3C。当钢管温度升至共晶线1150℃以上,奥氏体表面渗碳体开始熔解,晶粒开始剥蚀,至1020℃凝固结束,组织停止剥蚀。提出了浇铸过程中通过控制钢管过共晶线以上区域温度及时间可有效减少或避免钢管的溶蚀,并提出相应工艺措施。In the casting process of ductile iron,the heat temperature of the steel tubes embedded in the main lubricating oil of the small and medium-sized marine diesel engine block was too high,which main pipes will be melted easily at a high temperature.The corrosion mechanism of steel tubes without surface protection was discussed by measuring the temperature change of the steel tubes and the casting solution near the steel tubes during the filling process.The results show that when the temperature of the steel tube is above 600℃,carbon begins to permeate from the casting solution to the grain boundary of the steel tube,forming cementation Fe3C on the grain surface.When the temperature of the steel tube rises above 1150℃,the austenite surface cementite begins to melt and the grain begins to denudate,and the microstructure stops denudation when the solidification ends at 1020℃.It is proposed that the temperature and time above the eutectic line can effectively reduce or avoid the corrosion of steel tubes during the casting process,and the corresponding technological measures are put forward.