Abstract
An increase in the sum of alloying elements in industrial silumins causes the formation of excess intermetallic phases in their structure. When introducing modifiers in such alloys above a certain amount, structural components are coarsened because of overmodification, which can cause a decrease in the mechanical properties of cast alloys. The optimal consumption of the modifying microcrystalline remelt decreases from 0.6 to 0.3 wt % with an increase in the sum of alloying elements in alloys from 7.35% (AK7ch) to 14.3% (AK10M2N). When using the AlTi5 master alloy, the optimal amount of introduced titanium decreases from 0.05 to 0.01% and, in the case of the AlTi5B1 master alloy, from 0.02 to 0.01%. The modifying effect of the AlSr10 master alloy enhances with an increase in the silicon content with smaller amounts of strontium introduced into alloys. It is shown that the consumption of the metallic modifier depends on its modifying ability, as well as the sum of alloying elements in the modified silumin.
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References
Mishra, R.K. and Venkatesh, R., Theoretical evaluation of structural and various associated properties of Al–Si melts, Chem. Phys., 2008, vol. 354, nos. 1–3, pp. 112–117.
Piątkowski, The effect of Al–17 wt % Si alloy melt overheating on solidification process and microstructure evolution, Solid State Phenom., 2011, vol. 176, pp. 29–34.
Shittu, M.D., Ibitoye, S.A., Olawale, J.O., and Popoola, A.P.I., Superheat influence on mechanical properties of cast hypoeutectic aluminium–silicon alloy, Int. J. Cast Met. Res., 2012, vol. 25, no. 3, pp. 170–175.
Piatkowski, J., Gajdzik, B., and Matula, T., Crystallization and structure of cast A390.0 alloy with melt overheating temperature, Metalurgija, 2012, vol. 51, no. 3, pp. 321–324.
Calvo-Dahlborg, M., Popel, P.S., Kramer, M.J., Besser, M., Morris, J.R., and Dahlborg, U., Superheatdependent microstructure of molten Al–Si alloys of different compositions studied by small angle neutron scattering, J. Alloys Compd., 2013, vol. 550, pp. 9–22.
Barekar, N.S., Babu, N.H., Fan, Z., and Dhindaw, B.K., Effect of intensive shearing on morphology of primary silicon and properties of hypereutectic Al–Si alloy, Mater. Sci. Technol., 2010, vol. 26, no. 8, pp. 975–980.
Liu, Z. and Xie, M., Hypereutectic Al–Si–Mg in situ composite prepared by melt superheating, Adv. Mater. Res., 2011, vol. 194–196, pp. 113–116.
Sun, Y., Wang, Q., and Geng, H., Effects of complex modificating technique on microstructure and mechanical properties of hypereutectic Al–Si alloys, J. Mater. Sci., 2012, vol. 47, no. 5, pp. 2104–2109.
Al Kahtani, S.A., Effect of melt thermal treatment on eutectic silicon particles characteristics in cast Al–Si–Mg alloys, Adv. Mater. Sci. Appl., 2013, vol. 2, no. 4, pp. 144–153.
Nagendra Prasad, K. and Kumar, R., Investigations on effects of grain refinement on aluminum alloy casting, Int. J. Emerg. Trends Eng. Develop., 2015, vol. 4, no. 5, pp. 490–501.
Rathod, N.R. and Manghani, J.V., Effect of modifier and grain refiner on cast Al–7Si alloy: A review, Int. J. Emerg. Trends Eng. Develop., 2012, no. 2, vol. 5, pp. 574–581.
Lakhwinder, S., Geetesh, G., and Rupinderpreet, S., Review of the latest developments in grain refinement, Int. J. Modern Eng. Res., 2012, vol. 2, no. 4, pp. 2724–2727.
Nikitin, V.I. and Nikitin, K.V., Scientific principles of the development of a new class of fine-crystalline modifiers for metal melts, in: Teoriya i praktika tekhnologii proizvodstva izdelii iz kompozitsionnykh materialov i novykh metallicheskikh splavov: Materialy IV mezhduynarodnoi konferentsii (Theory and Practice of Manufacturing Technology of Products from Composite Materials and New Metal Alloys: Mater. IV Int. Conf.), Moscow: Znanie, 2005, pp. 297–307.
Nikitin, V.I. and Nikitin, K.V., Nasledstvennost’ v litykh splavakh (Heredity in Cast Alloys), Moscow: Mashinostroenie-1, 2005.
Nikitin, K.V., Nikitin, V.I., and Timoshkin, I.Yu., Upravlenie kachestvom litykh izdelii iz alyuminievykh splavov na osnove yavleniya strukturnoi nasledstvennosti (Quality Control of Cast Products from Aluminum Alloys Based on the Structural Heredity Phenomenon), Moscow: Radunitsa, 2015.
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Original Russian Text © K.V. Nikitin, V.I. Nikitin, I.Yu. Timoshkin, 2017, published in Izvestiya Vysshikh Uchebnykh Zavedenii, Tsvetnaya Metallurgiya, 2017, No. 3, pp. 72–75.
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Nikitin, K.V., Nikitin, V.I. & Timoshkin, I.Y. Influence of modifiers on the change of mechanical properties of silumins. Russ. J. Non-ferrous Metals 58, 378–382 (2017). https://doi.org/10.3103/S1067821217040125
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DOI: https://doi.org/10.3103/S1067821217040125