A two-dimensional axisymmetric finite element analysis is applied to the simulation of the solidification of the aluminium casting alloy LM 25. Solute redistribution during primary phase freezing is described using the Schell equation, and the two-phase eutectic is assumed to solidify over a temperature range of 2 K. Excellent agreement is found between the computed and experimental thermal analysis data for a dry sand axisymmetric casting. The model predictions are used to discuss the observed variation of casting density with distance from the feeder in unmodified dry sand castings with and without a chill, and a relationship is obtained for casting density at any location as a function of the computed value of the distance between the 90 and 100% solid isotherms.
MST /942
Get full access to this article
View all access options for this article.
References
1.
LEVIC. G. and MEHRABIANR.: Metall. Trans., 1980, 11B, 21–27.
WEIC., HANSENP. N., and BERRYJ. T.: in ‘Numerical methods in heat transfer’, (ed. LewisR. W.etal.), 461-472; 1983, New York, Wiley.
4.
SAMONDSM., LEWISR. W., MORGANK., and SYMBERLISTR.: in ‘Numerical methods in thermal problems’, (ed. LewisR. W. and MorganK., 64-86; 1985, Swansea, Pineridge Press.
5.
ABISS.: Metall. Trans., 1986, 1713, 209–216.
6.
YOOJ. and RUBINSKYB.: Int. J. Numer. Meth. Eng., 1986, 23, 1785–1805.
7.
BRODYH. D. and STOEHRR. A.: J. Met., Sept. 1980, 32, 21-27.
8.
RIEGGERO. K.: in ‘Modelling of casting and welding processes’, (ed. BrodyH.D. and ApelianD.), 39-72; 1981, New York, Metallurgical Society of AIME.
9.
BERRYJ. T., PEHLKER. D., and DESAIP. V.: in ‘Solidification processing’, 301-303; 1988, London, The Institute of Metals.
10.
CLYNET. W. and KURZW.: Metall. Trans., 1981, 12A, 965–971.
11.
CLYNET. W.: Met. Sci., 1982, 16, 441–450.
12.
GRANTJ. W.: in ‘Modelling of casting and welding processes’, (ed. BrodyH. D. and ApelianD., 19-37; 1981, New York, Metallurgical Society of AIME.
13.
RAPPAZM., Ph. THEVOZ, and W. KURZ: in ‘Numerical methods in thermal problems’, (ed. LewisR. W. and MorganK., 251-261; 1985, Swansea, Pineridge Press.
14.
PhTHEVOZ, MEZOU, and RAPPAZM.: in ‘Solidification process-ing’, 168-171; 1988, London, The Institute of Metals.
15.
McLELLAND. L. and TUTTLEM. M.: AFS Trans., 1983, 91, 243–252.
16.
SURAPPAM. K., BLANKE., and JACQUETJ. C.: Scr. Metall., 1986, 20, 1281–1286.
17.
BLANKE., ICURZW., and RAPPAZM.: Hely. Phys. Acta, 1985,58, 469.
18.
MEYERSC. W., SAIGALA. and BERRYJ. T.: AFS Trans., 1983, 91, 281–288.
19.
SURAPPAM. K., BLANKE. W., and JACQUETJ. C.: in ‘Solidification processing’, 424-427; 1988, London, The Institute of Metals.
20.
HUNTJ. D. and JACKSONK. A.: Trans. AIME, 1966, 236, 843–852.
21.
KIMC. B. and HEINER. W.: J. Inst. Met., 1963/64, 92, 367–376.
22.
DENTONJ. R. and SPITTLEJ. A.: Mater. Sci. Technol., 1985, 1, 305–311.
23.
GRUGELR. and KURZW.: Metall. Trans., 1987, 18A, 1137–1142.
24.
BRACALEG.: AFS Trans., 1962, 70, 228–252.
25.
JOHNSONW. H. and KURAJ. G.: Mod, Cast., 1959, 36, 73–90.
26.
PILLAIR. M., MALLYAV. D., and PANCHANTHANV.: AFS Trans., 1976, 84, 615–620.
27.
BOURNEs. and PrrrLEJ. A.: in ‘Solidification processing’, 291-293; 1988, London, The Institute of Metals.
28.
HAMARR.: Int. J. Numer. Meth. Eng., 1987, 24,219–229.
29.
STASAF. L.: ‘Applied finite element modelling for engineers’; 1985, Tokyo, CBS Publishing.
30.
ZIENKIEWICZO. C.: ‘The finite element method’,3rd edn; 1977, London, McGraw-Hill.
31.
COMINIG., GUIDICES. DEL, LEWISR. W., and ZIENKIEWICZO. C.: Int. J. Numer. Meth, Eng., 1974, 8, 613–624.
32.
MORGANK., LEWISR. W., and ZIENKIEWICZO. C.: Int. J. Numer. Meth. Eng., 1978, 12, 1191–1195.
33.
VOLLERV. R. and CROSSH.: in ‘Numerical methods in thermal problems’, (ed. LewisR. W. et al.), 91–101; 1983, Swansea, Pineridge Press.
34.
MEYERG. H.: in ‘Moving boundary problems’, (ed. WilsonD. G. et al.), 73–89; 1978, New York, Academic Press.
35.
DALHUIJSENA. J. and SEGALA.: Int. J. Numer. Meth. Eng., 1986, 23, 1807–1829.
36.
SCHEILE.: Z. Metallk., 1942, 34, 70–72.
37.
DANTZIGJ. X. and WIESEJ. W.: Metall. Trans., 1985, 1613, 203–209.
