Abstract
An ultrasonic device was designed to fabricate relatively small (about 0.7 kg) vacuum chill castings of FeAl-based alloys with improved microstructure. The influence of ultrasound on the solidification microstructure of the Fe-40 at.% Al based castings was investigated. The subsequent hot-rolling of such an as-cast alloy was made using a special stainless steel bandage of the casting. This effectively prevents fraying and cracking caused by the thermal shock arising at the surface of the hot casting, when it comes in contact with a cold roller. The efficiency of ultrasonic vacuum casting, based on the influence of the acoustic cavitation on the solidification of the melt, is manifested by a refined microstructure of the prepared iron aluminides Fe-40 at.% Al with addition of C or Zr and B. First results of improved mechanical properties of these alloys are presented and discussed.
References
[1] S.C.Deevi, V.K.Sikka: Intermetallics4 (1996) 357.Search in Google Scholar
[2] C.G.McKamey, in: N.S.Stoloff, V.K.Sikka, (Eds.), Physical Metallurgy and Processing of Intermetallic Compounds, Chapman and Hall, New York (1996) 351.10.1007/978-1-4613-1215-4_9Search in Google Scholar
[3] P.Lejček, A.Fraczkiewicz: Intermetallics11 (2003) 1053.Search in Google Scholar
[4] H.Skoglund, M.Knutson, B.Karlsson: Intermetallics12 (2004) 977.Search in Google Scholar
[5] W.J.Zhang, R.S.Sundar, S.C.Deevi: Intermetallics12 (2004) 893.Search in Google Scholar
[6] E.Arzt, R.Behr, E.Göhring, P.Grahle, R.P.Mason: Mater. Sci. Eng. A234 (1997) 22.Search in Google Scholar
[7] W.J.Zhang, R.S.Sundar, S.C.Deevi: Intermetallics12 (2004) 893.Search in Google Scholar
[8] C.Garcia Oca, M.A.Muñoz-Morris, D.G.Morris: Intermetallics11 (2003) 425.Search in Google Scholar
[9] D.G.Morris, J.Chao, C.G.Oca, M.A.Muñoz-Morris: Mater. Sci. Eng. A339 (2003) 232.Search in Google Scholar
[10] G.Ji, T.Grosdidier, N.Bozzolo, S.Launois: Intermetallics15 (2007) 108.Search in Google Scholar
[11] R.Baccino, D.San Filippo, F.Moret, A.Lefort, G.Webb, in: Proceedings of the PM'94, Powder Metallurgy World Congress, Paris, June 1994, Vol. II, Editions de Physique, Les Ulis, France (1994) 1239.Search in Google Scholar
[12] P.Kratochvíl, P.Málek, M.Cieslar, P.Hanus, J.Hakl, T.Vlasák: Intermetallics15 (2007) 333.Search in Google Scholar
[13] G.F.Balandin: Formation of Crystalline Structure of Ingots, Moscow: Maschinostroenie (1973).Search in Google Scholar
[14] G.I.Eskin: Ultrasonic Treatment of Light Alloy Melts, Gordon and Breach Science Publishers (1998).10.1201/9781498701792Search in Google Scholar
© 2009, Carl Hanser Verlag, München