Effect of Minor Elements on the Fluidity of Secondary LM25 and LM27-Type Cast Alloys
Date
2009Author
Mose, B.R
Maranga, S.M
Mbuya, T.O
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
In this study, the effect of individual and combined additions of Fe, Mn, Cr, Sr and Al-5Ti-1B grain refiner on the fluidity of secondary LM25 and LM27-type cast alloys was investigated. No change in fluidity was observed when the Fe level was increased from 0.14 to 0.4% in LM25, but it increased by 21% when Fe was raised to the critical content of 0.48%. Furthermore, a decrease of 32% resulted when the Fe level was increased to 0.6%. A combination of 0.3%Mn or 0.6%Cr with 0.6%Fe in LM25, resulted in a fluidity increase of 13 and 8%, respectively compared to the base alloy, but a combination of 0.6%Fe, 0.3%Mn and 0.2%Cr decreased the fluidity by 9%. A 34% increase in fluidity was observed when the Fe content in LM27 was raised from 0.41% to the critical level of 0.6%Fe with further increase when Mn was raised to 0.3%Mn. Increasing the Fe content to 1% in LM27 led to a drop in fluidity of 9%. Addition of 0.015%Sr and 0.02%Sr increased the fluidity of LM25 and LM27 by 9% and 21% respectively. Furthermore, a 0.28% Al-5Ti-1B grain refiner addition decreased the fluidity of LM 25 and LM27 by 2% and 19% respectively while a combined addition of 0.02%Sr and 0.28%Al-5Ti-1B decreased the fluidity of LM27 by 8%. Possible reasons for these observations are discussed.
URI
https://www.researchgate.net/profile/Thomas_Mbuya/publication/264155577http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/55582