Abstract
The cold isostatic pressing behaviour of aluminium and iron powders was analysed, both experimentally using a cold isostatic pressing unit, and numerically using a nonlinear finite element program. The pressing unit, which can withstand up to 650 MPa pressure was designed and constructed in this study. Aluminium and iron powders, having different hardness values and almost the same particle sizes, have been pressed in the pressure unit and the mechanical behaviours of these powders were investigated in the 100−500 MPa pressure range. Attained densities were about 98% for aluminium and 88% for iron powders. Pressing resulted in significant increases in microhardnesses of the aluminium and iron powders. Light and scanning electron microscopy examinations revealed that severe plastic deformation took place in the powders of aluminium and iron. The densification behaviour of aluminium and iron powders under the cold isostatic pressing was also analysed using the finite element method, in which an elastoplastic model was used to represent the powders. The relationship between the relative density of powder sample and applied pressure was predicted from finite element analysis and compared with the experimental data. A very good agreement between finite element results and experimental data was observed during the cold isostatic pressing.
References
[1] A.K.Eksi, R.Varol, S.Saritas: Metall58 (2004) 633–636.Search in Google Scholar
[2] M.Koizumu, M.Nishihara: Isostatic Pressing Technology and Applications, Elsevier Science Publishers Ltd. (1992).Search in Google Scholar
[3] A.Eksi, G.Veltl, F.Petzoldt, G.K.Lipp, C.M.Sonsino: Powder Metallurgy47 (2004) 60–64.10.1179/003258904225015392Search in Google Scholar
[4] P.J.James: Powder Metallurgy20 (1977) 199–203.10.1179/pom.1977.20.4.199Search in Google Scholar
[5] A.Eksi, M.K.Kulekci: Metalurgica43 (2004) 129–134.Search in Google Scholar
[6] R.M.German: Particle packing Characteristics, MPIF, Princeton, NJ, U.S.A. (1989).Search in Google Scholar
[7] M.Koerner: Powder Metallurgy Processing, Academic Press, New York (1978)Search in Google Scholar
[8] H.F.Fischmeister, E.Arzt, L.R.Olsson: Powder Metallurgy21 (1978) 179–187.10.1179/pom.1978.21.4.179Search in Google Scholar
[9] H.C.Jackson: Perspectives In Powder Metallurgy: Fundamentals, Methods and Applications, New York, U.S.A. (1967).Search in Google Scholar
[10] P.J.James: Isostatic Pressing Technology, Applied Science Publishers Ltd. (1983).Search in Google Scholar
[11] T.Sheppard, H.B.Mcshane: Powder Metallurgy23 (1980) 120–124.10.1179/pom.1980.23.3.120Search in Google Scholar
[12] A.Zavaliangos, in: The 2002 Int. Conf. on Process Modelling in Powder Metallurgy and Particulate Materials, MPIF, Princeton, NJ, U.S.A. (2002).Search in Google Scholar
[13] R.W.Lewis, A.G.K.Jinka, D.T.Gethin: Powder Metallurgy International25 (1993) 287–293.Search in Google Scholar
[14] C.Y.Wu, O.M.Ruddy, A.C.Bentham, B.C.Hancock, S.M.Best, J.A.Elliott: Powder Technology152 (2005) 107–117.10.1016/j.powtec.2005.01.010Search in Google Scholar
[15] D.C.Drucker, W.Prager: Quarterly of Applied Mathematics10 (1952) 157–165.10.1090/qam/48291Search in Google Scholar
[16] K.H.Roscoe, J.B.Burland: Engineering Plasticity, Cambridge University Press (1968).Search in Google Scholar
[17] F.L.Dimaggio, I.S.Sandler: Journal of Mechanical Engineering ASCE96 (1971) 935–950.Search in Google Scholar
[18] H.Chtourou, M.Guillot, A.Gakwaya, M.Guillot: Int. J. of Solids and Structures39 (2002) 1059–1075.10.1016/S0020-7683(01)00255-4Search in Google Scholar
[19] X.K.Sun, S.J.Chen, J.Z.Xu, L.D.Zhen, K.T.Kim: Mater. Sci. Eng.267 (1999) 43–49.10.1016/S0921-5093(99)00052-0Search in Google Scholar
[20] J.Crawford, P.Lindskog: Scandinavian Journal of Metallurgy12 (1983) 277–281.Search in Google Scholar
[21] I.S.Sandler, F.L.Dimaggio, G.Y.Baladi: J. of the Engrng. Div.102 (1976) 638–699.Search in Google Scholar
[22] S.C.Lee, K.T.Kim: Int. J. Mech. Sci.44 (2002) 1295–1308.10.1016/S0020-7403(02)00054-1Search in Google Scholar
[23] A.K.Eksi, M.Laman, C.D.Atis, A.Yildiz, A.O.Kurt: Kovové Material-Metallic Materials42 (2004) 339–352.Search in Google Scholar
[24] M.Szanto, W.Bier, N.Frage, S.Hartmann, Z.Yosibash: Int. J. Mech. Sci.50 (2008) 405–421.10.1016/j.ijmecsci.2007.10.004Search in Google Scholar
[25] M.Reiterer, T.Kraft, U.Janosovits, H.Riedel: Ceramics International30 (2004) 177–183.10.1016/S0272-8842(03)00086-5Search in Google Scholar
[26] T.Sinha, J.S.Curtis, B.C.Hancock, C.Wassgren: Powder Technology198 (2010) 315–324.10.1016/j.powtec.2009.10.025Search in Google Scholar
[27] R.B.J.Brinkgreve: PLAXIS, Finite Element Code for Soil and Rock Analyses, 2D-Version 8, Rotterdam (2002).Search in Google Scholar
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