摘要
采用A l-5Ti-1B中间合金作为细化剂细化A357合金,考察细化剂加入量、保温温度及熔体在不同温度下保温时间对晶粒尺寸的影响,研究了A l-5Ti-1B中间合金对A357合金晶粒细化效果.研究表明:A l-5Ti-1B可明显减小A357合金的晶粒尺寸,并且在较长的时间内保持良好的细化效果;熔体长时间静置后易出现(钛)偏析,底部Ti含量比顶部要高,致使铸件整体细化效果大大降低;定期对熔体进行搅拌可有效消除偏析.
When insulated in a maintaining furnace for a relatively long period of time, the performance of liquid alloy treated by Al -5Ti - 1B deteriorated because of inoculation fade and segregation. This paper discusses how A357 alloy was refined by using Al -5Ti - 1B matter alloy as a refining agent. The effects of the amount of refining agent, holding temperature and holding time were investigated. The effects of Al -5Ti - 1B on grain refinement were also studied. The results indicated that Al - 5Ti - 1B can significantly decrease the grain size of A357 alloy and the refine function can be retained for a long time. However, segregation of Ti can occur after the alloy is steady for a long time. The Ti content at the bottom is higher than that at the top of the furnace. Ti segregation can be avoided by stirring the molten alloy periodically.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2006年第2期171-173,177,共4页
Materials Science and Technology
