The influence of graphite particles on solidification of composite suspension during flow

• Autorzy: Konopka Z. , Łągiewka M. , Zyska A.
• Języki publikacji: EN

Abstrakty

EN

The measurements concerning the temperature field of the composite suspension with AlMg10 alloy matrix reinforced with graphite particles during its flow in a runner-like mould cavity have been performed for the purpose of investigating the influence of the graphite particles on the solidification kinetics. Applying the derivative differential thermal analysis method, the kinetics of solidification heat release has been calculated for examined composites. The time-dependent quantity of solid phase crystallized over the period of flow has been determined on this basis. The dependence of the solid phase quantity upon the momentary length of the experimental casting has apportioned the length of the solidification zone in the casting and the critical fraction of solid phase at which the flow stops. The solidification zone is longer and the critical fraction of solid phase at the stream front is lower for composite containing 10% of graphite particles than for the one with 20% of graphite. The composite reinforced with 20% of graphite particles flows at a significantly lower rate and exhibits reduced castability as compared with the composite with 10% of graphite. It is caused by the higher solidification rate in the initial stage of the process. The obtained results allow for supposing that graphite particles intensify composite solidification by changing the kinetics of the process.

Słowa kluczowe

EN

casting composites; suspension flow; solidification of composites; solid phase fraction; graphite particles

PL

kompozyty; przepływ; krzepnięcie kompozytu

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2007
• Tom: Vol. 7, iss. 2
• Strony: 135--138
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Konopka Z.

autor

Łągiewka M.

autor

Zyska A.

• Katedra Odlewnictwa, Politechnika Częstochowska, Al. Armii Krajowej 19, 42-200 Częstochowa,

Bibliografia

• [1] Szweycer M.: Interfacial transition of a foreign phase, Surface phenomena in casting processes, Kraków 1996, p. 83-102, (in Polish).
• [2] Z. Konopka, M. Łągiewka, Solidification of AlMg10 alloy during flow in casting mould, Hutnik, No 6, 2006, p. 285-289, (in Polish), (in Polish).
• [3] Z. Konopka, M. Łągiewka, A. Zyska, S. Nocuń, A. Bober, Effect of AlMg10 alloy supercooling on solidification during flowing, Archives of Foundry, 2006, p. 272-277, (in Polish).
• [4] Flemings M.C., Solidification processing, New York Mc-Grow-Hill 1974.
• [5] Arsov. B., Steel castings, Moskwa 1970, (in Russian).
• [6] Dhalt G., Gao D.M., Finite element simulation of metal flow in moulds, Int. J. For Num. Meth. In Eng., 1990, vol. 30, p. 821-831.
• [7] M. Dudyk, Crystallization and thermal expansion of alloys and silumine composites, Archives of Foundry, 2006, p. 164-169, (in Polish).
• [8] Konopka Z., Cisowska M., Zyska A., Relation between surface tension and fluidity in AlMg10-graphite particles composite, Archives of Mechanical Technology and Automation, vol.21, nr spec.2001, (in Polish).
• [9] Bokota A., Sowa L., Applying of finite element method to the castability test modelling, Archives of Foundry, vol. 1, No 1, 2001, 42-47, (in Polish).
• [10] Qudong W., Yizhen L., Xiaoqin Z., Wenjiang D., Yanping Z., Qinghua L., Jie L., Study on the fluidity of AZ91+xRE magnesium alloy, Materials Science and Engineering A271, 1999, p.109-115.
• [11] Zhang B., Zhao Y., Numerical method for simulation of forced convection In composite porous/fluid system, Heat and Fluid Flow, 21, 2000, s. 432-441.
• [12] Poitou A., Chinesta F., Torres R., Numerical simulation of the steady recirculating flows of fiber suspensions, Journal of Non-Newtonian Fluid Mechanics, 90, 2000, s. 65-80.
• [13] Baloch A., Webster M.F., A computer simulation of complex flows of fibre suspension, Computers and Fluids, vol. 24, nr 2, 1995, s. 135-151.