INFLUENCE OF THE CHARACTER AND DEGREE OF ALLOYING ON THE TENDENCY TO SEGREGATION IN CAST BILLETS OF DEFORMABLE ALUMINUM ALLOYS
DOI:
https://doi.org/10.14529/met180408Keywords:
aluminum alloys, Al–Mn, Al–Mg, duralumin, segregation, degree of homogeneityAbstract
Production of high-quality semi-finished product from aluminum wrought alloys for subsequent deformation (rolling, stamping or pressing) is provides by obtaining the initial defect-free cast billet.
The level of mechanical properties of alloys in the cast and heat-treated state is determined mainly by the internal structure of the grains, therefore one of the main parameters affecting the quality of the cast billet for subsequent plastic deformation is the manifestation of chemical heterogeneity of grains in the content of alloying elements or segregation.
In this work, the alloys Al–Mn, Al–Mg and duralumin are investigated according to the method previously proposed by the same authors. These alloys can be conventionally chosen as model ones, to study the influence of the alloying character on the tendency of wrought aluminum alloys to manifest segregation effects in the cast state.
Comparing the local content of alloying elements on the axes of dendrites with the brand composition of the alloys, a significant discrepancy was noted. This discrepancy is a measure of the inhomogeneity of the alloy.
Taking the degree of deviation of the local composition from the brand as the value characterizing the degree of inhomogeneity of cast alloys Al–Mn, Al–Mg and duralumin, the values of the average homogeneity coefficient of these alloys are calculated.
The homogeneity criterion, determined for the aluminum base of alloys, shows the dependence of the degree of homogeneity on the change in the nature of alloying and the content of alloying elements. Significant differences between the local content of alloying elements in the axes of the dendrites and the grade composition of the alloys were revealed.
References
Kaufman J.G., Rooy E.L. Aluminum Alloy Castings: Properties, Processes, and Applications. 1st printing. ASM International, 2004. 340 p.
Belousov N.N. Plavka i razlivka splavov tsvetnykh metallov [Melting and Casting of Non-Ferrous Metal Alloys]. Under the General Editorship of A.M. Lipnitsky. Moscow, Mashgiz, 1961. 80 p.
Kolachev BA, Elagin V.I., Livanov B.A. Metallovedeniye i termicheskaya obrabotka tsvetnykh metallov i splavov [Metallovedenie and Heat Treatment of Non-Ferrous Metals and Alloys]. Moscow, MISIS Publ., 1999. 416 p.
Altman M.B., Andreev A.D., Balakhontsev G.A. et. al. Plavka i lit’ye alyuminiyevykh splavov [Melting and Casting of Aluminum Alloys: Ref. ed.]. Moscow, Metallurgy Publ., 1983. 352 p.
Zolotorevsky V.S. Struktura i prochnost’ litykh alyuminiyevykh splavov [Structure and Strength of Cast Aluminum Alloys]. Moscow, Metallurgy Publ., 1981. 192 p.
Belyaev A.P., Gokhstein M.B., Marayev S.E. Rafinirovaniye i lit’ye pervichnogo alyuminiya [Refining and Casting of Primary Aluminum]. Moskow, Metallurgy Publ., 1966. 76 p.
Kuzmin, B.A. Tekhnologiya konstruktsionnykh materialov [Metal Technology and Structural Materials]. Moskow, Mashinostroenie Publ., 1981. 351 p.
Dalsky, A.M. Tekhnologiya konstruktsionnykh materialov [Technology of Construction Materials]. Moskow, Mashinostroenie Publ, 1985. 448 p.
Lakhtin Yu.M., Leontyeva V.P. Materialovedeniye [Materials Science]. Moskow, Mashinostreniе Publ., 1990. 528 p.
Kurdyumov A.V., Pikunov M.V. Proizvodstvo otlivok iz splavov tsvetnykh metallov [The Production of Castings from Alloys of Non-Ferrous Metals]. 2nd ed. Moscow, MISIS Publ., 1996. 504 p.
Novikov I.I., Zolotorevsky B.C. Dendritnaya likvatsiya v splavakh [Dendritic Liquation in Alloys]. Moscow, Nauka Publ., 1966. 155 p.
Mondolfo L.F. Struktura i svoystva alyuminiyevykh splavov [Structure and Properties of Aluminum Alloys]. Moscow, Metallurgy Publ., 1979. 640 p.
Mysik R.K., Loginov Yu.N., Sulitsin A.V., Brusnitsyn S.V. Proizvodstvo litykh zagotovok iz deformiruyemykh alyuminiyevykh i mednykh splavov [Production of Cast Billets from Wrought Aluminum and Copper Alloys]. Ekaterinburg, Ural Federal University Publ., 2011. 414 p.
Maslenkov S.B., Golikov I.N., Dendritnaya likvatsiya v stalyakh i splavakh [Dendritic Segregation in Steels and Alloys]. Moscow, Metallurgy Publ., 1977. 224 p.
Kuzmin M.P., Kuzmina M.Yu. [The Elimination and Quality Improvement of Samples of Cast Aluminum Alloys]. Bultin of ISTU, 2013, no. 12 (83), pp. 210–213. (in Russ.)
Brodova I.G., Polents I.V., Esin V.O. [Regularities in the Formation of a Molded Structure of Supercooled Al-Ti. Physics of metals and metal science, 1992, no. 1, рp. 84–89. (in Russ.)
Gulyaev A.P. Metallovedeniye [Metal Science]. Moscow, Metallurgy Publ., 1986. 544 p.
Ilin S.I., Koryagin Yu.D., Shaburova N.A., Sudarikov M.V., Vorobyov O.V. Analytical Possibilities of Estimation of the Degree of Homogeneity of the Cast Aluminum Alloys. Bulletin of the South Ural State University. Ser. Metallurgy, 2018, vol. 18, no. 2, pp. 64–71. (in Russ.) DOI: 10.14529/met180208
