Abstract
High temperature deformation behavior of a Ni30Co17Fe53 alloy has been investigated by carrying out hot compression tests at temperatures ranging from 600°C to 1150°C under strain rates between 10−5 and 1 s−1. Both the temperature and strain-rate dependence of the flow stress were found to be described by a hyperbolic sine function. Hot formability of this alloy was also estimated by constructing an empirical processing map based on a dynamic materials model, from which the region with high power dissipation efficiency was exhibited as a feasible combination of processing condition at around 1150°C and 10−2 s−1. Three different thermo-mechanical treatment processes were adopted for hot-forging to investigate its influence on microstructure and subsequent thermal expansion and thermal conductivity.
References
[1] G.W.Liu, F.Valenza, M.L.Muolo, A.Passerone: J. Mater. Sci.45 (2010) 4299. 10.1007/s10853-010-4337-3Search in Google Scholar
[2] A.I.Uvalov, V.A.Kazantsev, N.F.Vil'danova, E.I.Anufrieva: Russ. Metall.3 (2010) 223.Search in Google Scholar
[3] J.T.Yeom, E.J.Jung, J.H.Kim, J.K.Hong, N.K.Park, S.S.Choi, C.S.Lee: Key Eng. Mater.385–387 (2008) 501. 10.4028/www.scientific.net/KEM.385-387.501Search in Google Scholar
[4] K.A.Lee, J.H.Park, B.H.Cho, J.Namgung: J. Korean Inst. Met. & Mater.41 (2003) 539.Search in Google Scholar
[5] T.Sakai: J. Mater. Proc. Technol.53 (1995) 349. 10.1016/0924-0136(95)01992-NSearch in Google Scholar
[6] C.M.Sellars, W.J.McG. Tegart: Mém. Scient. Revue Métall.63 (1966) 731.Search in Google Scholar
[7] Y.V.R.K.Prasad, H.L.Gegel, S.M.Doraivelu, J.C.Malas, J.T.Morgan, L.A.Lark, D.R.Barker: Metal. Trans. A15 (1984) 1883.Search in Google Scholar
[8] www.specialmetals.com.Search in Google Scholar
[9] G.Xu, Y.W.Zhang, C.S.Liao, C.H.Yan: Solid State Ionics166 (2004) 391. 10.1016/j.ssi.2003.11.014Search in Google Scholar
[10] M.Mikami, A.Matsumoto, K.Kobayashi: J. Alloys Compd.461 (2008) 423. 10.1016/j.jallcom.2007.07.004Search in Google Scholar
[11] Y.Liu, Z.Wu, J.Li, B.Shen, W.Hu: Scripta Mater.63 (2010) 359. 10.1016/j.scriptamat.2010.04.006Search in Google Scholar
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