Journal of Computational Applied Mechanics

Effects of Casting Speed and Runner Angle on Macrosegregation of Aluminium-Copper Alloy.

Document Type : Research Paper

Authors

1 Department of Metallurgical and Materials Engineering, Faculty of Engineering, University of Lagos, Akoka, Yaba, Nigeria.

2 Department of Mechanical Engineering, University of Lagos, Nigeria

Abstract

Abstract
During the solidification of binary metal alloys, chemical heterogeneities at product scale over a long distance range (1cm-1m) develop and this has detrimental effect on the resulting mechanical properties of cast products. Macrosegregation is of great concern to alloy manufacturers and end users as this problem persist. In this study, the use of process parameters namely casting speed and runner angle to reduce macro-segregation in aluminum-copper-zinc binary alloy solidification is reported. The results from optical microscope, scanning electron microscope and energy dispersive spectrometry show that these parameters significantly influenced the development, size and volume of macro-segregation. The combination of parameters namely the pouring height between 96 mm/s, 100mm/s, and runner angles between 1200, 1500 produced less segregations with improved mechanical properties within standard specification. The tensile strength (110 MPa), modulus of elasticity (6800 MPa) and 2.5 % elongation obtained in this study are within standard (88- 124 MPa), 7100 MPa and (1-25 %) respectively for this class of alloy.

Keywords

Main Subjects

[1]     A. Jafaria, S. Seyedeina, M. Aboutalebia, D. Eskinb, L. Katgermanb, Numerical Modeling of Macrosegregation during the Direct-Chill Casting of an Al alloy Billet, Iranian Journal of Materials Science and Engineering, Vol. 7, No. 3, pp. 0-0, 2010.
[2]     Y. Wang, S. Wu, X. Xue, R. Chen, J. Zhang, W. Xiao, Experimental and numerical study on formation mechanism of linear macro-segregation in low-pressure die casting of Al–Cu–Mn–Ti Alloy, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 231, No. 10, pp. 1946-1955, 2017.
[3]     M. Ahmadein, M. Wu, A. Ludwig, Analysis of macrosegregation formation and columnar-to-equiaxed transition during solidification of Al-4 wt.% Cu ingot using a 5-phase model, Journal of crystal growth, Vol. 417, pp. 65-74, 2015.
[4]     K. C. Bala, R. H. Khan, Rate of solidification of aluminium casting in varying wall thickness of cylindrical metallic moulds, Leonardo Journal of Sciences, Vol. 13, No. 25, pp. 19-30, 2014.
[5]     K. Fezi, A. Plotkowski, M. J. M. Krane, Macrosegregation modeling during direct-chill casting of aluminum alloy 7050, Numerical Heat Transfer, Part A: Applications, Vol. 70, No. 9, pp. 939-963, 2016.
[6]     B. S. Kamble, S. M. Kadane, Design of Gating System, Metal Flow and Solidification for a Die Casting Component Using Virtual Simulation Technique, International Research Journal of Engineering and Technology [IRJET], Vol. 3, No. 6, pp. 1690-1695, 2016.
[7]     Y. Yin, J. Zhou, Z. Guo, H. Wang, D. Liao, T. Chen, The Through Process Simulation of Mold filling, Solidification, and Heat Treatment of the Al Alloy Bending Beam Low-pressure Casting, in Proceeding of, IOP Publishing, pp. 012043.
[8]     M. O. El-Bealy, Macrosegregation quality criteria and mechanical soft reduction for central quality problems in continuous casting of steel, Materials Sciences and Applications, Vol. 5, No. 10, pp. 724, 2014.
[9]     Z. Duan, X. Du, H. Shen, B. Liu, Numerical study of macrosegregation in a large steel ingot with multiple pouring process, in Proceeding of, IOP Publishing, pp. 012048.
[10]   N. Jamaly, N. Haghdadi, A. Phillion, Microstructure, macrosegregation, and thermal analysis of direct chill cast aa5182 aluminum alloy, Journal of Materials Engineering and Performance, Vol. 24, No. 5, pp. 2067-2073, 2015.
[11]   D. G. Eskin, V. I. Savran, L. Katgerman, Effects of melt temperature and casting speed on the structure and defect formation during direct-chill casting of an Al-Cu alloy, Metallurgical and Materials Transactions A, Vol. 36, No. 7, pp. 1965-1976, 2005.
[12]   M. Blair, R. Monroe, C. Beckermann, The Effect of Pour Time and Head Height on Air Entrainment, in Proceeding of.
[13]   J. Zeng, W. Chen, Effect of secondary cooling conditions on solidification structure and central macrosegregation in continuously cast high-carbon rectangular billet, High Temperature Materials and Processes, Vol. 34, No. 6, pp. 577-583, 2015.
[14]   V. L. H. N. T. POLJE, K. U. G. I. JEKLA, Impact of casting speed on the temperature field of continuously cast steel billets, Materiali in tehnologije, Vol. 47, No. 4, pp. 507-513, 2013.
[15]   D. G. Eskin, 2008, Physical metallurgy of direct chill casting of aluminum alloys, CRC press,
[16]   P. Serrao, B. Chiranth, N. Vaz, A. Fernandis, P. Rao, Effect of Equal Chanel Angular Pressing and Age Hardening on the Hardness of Al-Mg-Si Alloy, American Journal of Materials Science, Vol. 7, No. 5, pp. 150-155, 2017.
[17]   S. Manasijevic, R. Radisa, S. Markovic, Z. Acimovic-Pavlovic, K. Raic, Thermal analysis and microscopic characterization of the piston alloy AlSi13Cu4Ni2Mg, Intermetallics, Vol. 19, No. 4, pp. 486-492, 2011.
[18]   Y. Cho, H.-C. Lee, K. Oh, A. Dahle, Effect of strontium and phosphorus on eutectic Al-Si nucleation and formation of β-Al 5 FeSi in hypoeutectic Al-Si foundry alloys, Metallurgical and Materials Transactions A, Vol. 39, No. 10, pp. 2435-2448, 2008.
[19]   S. Steinbach, L. Ratke, G. Zimmermann, O. Budenkova, Formation of intermetallic phases in AlSi7Fe1 alloy processed under microgravity and forced fluid flow conditions and their influence on the permeability, in Proceeding of, IOP Publishing, pp. 012019.
[20]   D. V. Malakhov, D. Panahi, M. Gallerneault, On the formation of intermetallics in rapidly solidifying Al–Fe–Si alloys, Calphad, Vol. 34, No. 2, pp. 159-166, 2010.
[21]   G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Intermetallic phase particles in 6082 aluminium alloy, Archives of Materials Science and Engineering, Vol. 28, No. 2, pp. 69-76, 2007.
[22]   C. Charitidis, E. Koumoulos, V. Nikolakis, D. Dragatogiannis, Structural and nanomechanical properties of a zeolite membrane measured using nanoindentation, Thin Solid Films, Vol. 526, pp. 168-175, 2012.
Journal of Computational Applied Mechanics
Volume 49, Issue 2
December 2018
Pages 373-379
  • Receive Date: 27 April 2018
  • Revise Date: 08 May 2018
  • Accept Date: 22 May 2018