Analysis of the Applicability of Heat Treatment of EN AC-46000 Alloy Castings Made with Vacuum-Assisted HPDC Technology
DOI:
https://doi.org/10.24425/afe.2025.153775Abstract
The aim of the study was optimization of the technological parameters of the thermal treatment of EN AC-46000 alloy products made in the vacuum aided HPDC technology in the function of simultaneous maximization of the alloy’s mechanical properties with no deformation of the cast’s surface. The produced casts were subjected to thermal treatment T6 according to the elaborated experiment plan. The samples were examined in respect of selected mechanical properties as well as the presence of deformation on the castings surfaces. Also performed was an analysis of the castings microstructure as well as optimization of the technological parameters of the supersaturation and ageing process by means of statistical methods, i.e. the Box-Wilson optimization method (Stage I) and stepwise multiple regression in the Statgraphics software (Stage II). Also, a simulation was carried out, predicting the mechanical properties for the specific supersaturation and ageing parameters, from which optimized values of the setpoints of both processes were obtained. The study presents the results of validation tests of pressure casts subjected to thermal treatment performed according to the previously determined optimal parameters of supersaturation and ageing. These results confirmed the effectiveness of the conducted precipitation hardening treatment.References
[1] Farkoosh, A.R., Chen, X.G. & Pekguleryuz, M. (2015). Dispersoid strengthening of a high temperature Al–Si–Cu–Mg alloy via Mo addition. Materials Science and Engineering: A. 620, 181-189. https://doi.org/10.1016/j.msea.2014.10.004.
[2] Kim, H.Y., Han, S.W. & Lee, H.M. (2006). The influence of Mn and Cr on the tensile properties of A356–0.20Fe alloy. Materials Letters. 60(15), 1880-1883. https://doi.org/ 10.1016/j.matlet.2005.12.042.
[3] Elhadari, H.A., Patel, H.A., Chen, D.L. & Kasprzak, W. (2011). Tensile and fatigue properties of a cast aluminum alloy with Ti, Zr and V additions. Materials Science and Engineering: A. 528(24), 8128-8138. https://doi.org/10.1016/j.msea.2011.07.018.
[4] Li, Y., Yang, Y., Wu, Y., Wei, Z. & Liu, X. (2011). Supportive strengthening role of Cr-rich phase on Al–Si multicomponent piston alloy at elevated temperature. Materials Science and Engineering: A. 528(13-14), 4427-4430. https://doi.org/10.1016/j.msea.2011.02.047.
[5] Sjölander, E. & Seifeddine, S. (2010). The heat treatment of Al–Si–Cu–Mg casting alloys. Journal of Materials Processing Technology. 210(10), 1249-1259. https://doi.org/10.1016/j.jmatprotec.2010.03.020.
[6] Sjölander, E. & Seifeddine, S. (2011). Artificial ageing of Al–Si–Cu–Mg casting alloys. Materials Science and Engineering: A. 528(24), 7402-7409. https://doi.org/10.1016/j.msea.2011.06.036.
[7] Sjölander, E. & Seifeddine, S. (2010). Optimisation of solution treatment of cast Al–Si–Cu alloys. Materials and Design. 31(1), 44-S49. https://doi.org/10.1016/ j.matdes.2009.10.035.
[8] Lumley, R.N., Gunasegaram, D.R., Gershenzon, M. & O’Donnell, R.G. (2010). Effect of alloying elements on heat treatment response of aluminium high pressure die castings. International Heat Treatment and Surface Engineering. 4(1), 25-32. https://doi.org/10.1179/174951409X12542264514004.
[9] Bonollo, F., Urban, J., Bonatto, B., & Botter, M. (2005). Gravity and low pressure die casting of aluminium alloys: A technical and economical benchmark. La Metallurgia Italiana. 6, 23-32.
[10] Szymczak, T., Gumienny, G. & Pacyniak, T. (2014). Selected aspects of nitrogen refinement of Silumin 226. Archives of Foundry Engineering. 14(3), 99-102. https://doi.org/10.2478/afe-2014-0070.
[11] Ozhoga-Maslovskaja, O., Gariboldi, E. & Lemke, J. N. (2016). Conditions for blister formation during thermal cycles of Al–Si–Cu–Fe alloys for high pressure die-casting. Materials and Design. 92, 151-159. https://doi.org/10.1016/j.matdes.2015.12.003.
[12] Lumley, R.N., O’Donnell, R.G., Gunasegaram, D.R. & Givord, M. (2007). Heat treatment of high-pressure die castings. Metallurgical and Materials Transactions A. 38(12), 2564-2574. https://doi.org/10.1007/s11661-007-9285-4.
[13] Lumley, R.N., Deeva, N. & Gershenzon, M. (2010). The optimization of strength and ductility in heat treated ADC12 alloys. In 12th International Conference on Aluminium Alloys, 5-9 September 2010 (pp. 2197-2202). The Japan Institute of Light Metals.
[14] Yang, H., Ji, S. & Fan, Z. (2015). Effect of heat treatment and Fe content on the microstructure and mechanical properties of die-cast Al–Si–Cu alloys. Materials and Design. 85, 823-832. https://doi.org/10.1016/j.matdes.2015.07.074.
[15] PN-EN 1706:2020-10 Aluminium and Aluminium Alloys - Castings - Chemical Composition and Mechanical Properties.
[16] PN-EN ISO 6892-1:2020-05 Metals − Tensile Test − Part 1: Room Temperature Test Method. (in Polish).
[17] PN-EN ISO 6506-1:2014-12 Metallic Materials − Brinell Hardness Test − Part 1: Test Method. (in Polish).
[18] Belov, N.A., Eskin, D.G. & Aksenov, A. (2005) Multicomponent Phase Diagrams. Applications for commercial aluminum alloy. Oxford: Elsevier.
[19] Glazoff, M., V., Khvan, A. & Zolotorevsky, V.S. (2018). Casting Aluminum Alloys. Their physical and mechanical metallurgy. Butterworth-Heinemann.
[20] Belov, N., Aksenov, A.A. & Eskin, D.G. (2002). Iron in Aluminum Alloys: Impurity and alloying elements. London: CRC Press.
[21] Szymczak, T. (2019). The Influence of Cr, Mo, V, and W on the Crystallization Process and Mechanical Properties of Hypoeutectic Silumins. Łódź: Lodz University of Technology Publishing House. (in Polish).
[22] Callegari, B., Lima, T.N. & Coelho, R.S. (2023). The influence of alloying elements on the microstructure and properties of Al-Si-based casting alloys: A review. Metals. 13(7), 1174, 1-36. https://doi.org/10.3390/met13071174.
[23] Kowalczyk, W., Dańko, R., Górny, M., Kawalec, M. & Burbelko, A. (2022). Influence of high-pressure die casting parameters on the cooling rate and the structure of EN-AC 46000 alloy. Materials. 15(16), 5702, 1-16. https://doi.org/10.3390/ma15165702.
[24] Bolibruchová, D., Matejka, M., Michalcová, A., & Kasińska, J. (2020). Study of natural and artificial aging on AlSi9Cu3 alloy at different ratios of returnable material in the batch. Materials. 13(20), 4538, 1-16. https://doi.org/10.3390/ma13204538.
[25] Ruyao Wang, Weihua Lu. (2016). Hypereutectic Al-Si alloy with completely nodular eutectic silicon: microstructure and process. International Journal of Materials Science and Applications. 5(6), 277-283. https://doi.org/10.11648/j.ijmsa.20160506.17.
[26] Jarco, A.; Pezda, J. (2021). Effect of heat treatment process and optimization of its parameters on mechanical properties and microstructure of the AlSi11(Fe) Alloy. Materials. 14(9), 2391, 1-20. https://doi.org/10.3390/ma14092391.
[27] Pietrowski, S. (2001). Al-Si alloys. Łódź: Lodz University of Technology Publishing House. (in Polish).
