Strain Hardening Behaviour of Hipped and Non-Hipped Castings of Aluminium Alloy 354 Subjected to Two-Step Ageing Treatments

Abstract:

Cast aluminium alloys are being employed increasingly in the automotive sector due to their light weight and excellent castability. This paper focuses on the strain hardening behaviour of Hipped and non-Hipped components of cast aluminium alloy 354 subjected to two-step ageing, as opposed to the routinely carried out single-step ageing. First step ageing (at 100°C) was carried out for 2 h and 5 h; ageing time at second step (at 170°C) was 1, 2 and 5 h. Mechanical properties and strain hardening behaviour were evaluated for different variants of two-step ageing treatment. Analysis of the results shows that the Hipped components have higher hardening capacity and generally higher strain hardening rate compared to the non-Hipped ones. Some of the two-step ageing treatments give mechanical properties comparable to the conventional T61 treatment, but with significantly higher strain hardening rate.

• Periodical: Advanced Materials Research (Volume 906)
• Pages: 249-253
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.906.249
• Online since: April 2014
• Authors: Arnav Gupta*, Aditya Eswar, G. Dinesh Babu, Nageswara Rao Muktinutalapati
• Keywords: Cast Aluminium Alloy 354, Hardening Capacity, HIPping, Strain Hardening Rate, Two-Step Ageing

References

[1] F.J. Tavitas-Medrano, A.M.A. Mohamed, J.E. Gruzleski, F.H. Samuel, H.W. Doty: Precipitation-Hardening in cast Al-Si-Cu-Mg alloys, Journal of Materials Science, Vol. 45 (2010), pp.641-651.

DOI: 10.1007/s10853-009-3978-6

[2] H.R. Ammar, A.M. Samuel, F.H. Samuel, E. Simielli, G.K. Sigworth, and J.C. Lin: Influence of Aging Parameters on the Tensile Properties and Quality Index of Al-9 Pct Si-1. 8 Pct Cu-0. 5 Pct Mg 354-Type Casting Alloys, Metallurgical and Materials Transactions A, ASM International (2011).

DOI: 10.1007/s11661-011-0808-7

[3] K.T. Kashyap, C. Ramachandra, B. Chatterji, S. Lele: A model for two-step ageing, Bulletin of Material Science, Vol. 23, No. 5, October 2000, pp.405-411.

DOI: 10.1007/bf02708391

[4] F.H. Samuel, A.M. Samuel, H. Liu: Effect of magnesium content on the ageing behaviour of water-chilled Al-Si-Cu-Mg-Fe-Mn (380) alloy castings, Journal of Materials Science, 15 May 1995, Volume 39, Issue 10, pp.2531-2540.

DOI: 10.1007/bf00362130

[5] E. Sjölander, S. Seifenddine: The heat treatment of Al-Si-Cu-Mg casting alloys, Journal of Materials Processing Technology, Vol. 210 (2010), pp.1249-1259.

DOI: 10.1016/j.jmatprotec.2010.03.020

[6] G. Dinesh Babu, M. Nageswara Rao: Effect of non- conventional ageing treatments on the tensile properties of cast aluminium alloy 354, in press.

[7] G. Ran, J. Zhou, Q.G. Wang: The effect of hot isostatic pressing on the microstructure and tensile properties of an unmodified A356-T6 cast aluminium alloy, Journal of Alloys and Compounds 421 (2006), pp.80-86.

DOI: 10.1016/j.jallcom.2005.11.019

[8] A. Eswar, A. Gupta, G. Dinesh Babu, M. Nageswara Rao: Analysis of strain hardening behaviour of cast aluminium alloy 354 subjected to artificial ageing at various temperatures, Advanced Materials Research Journal, Vol. 856 (2014), pp.231-235.

DOI: 10.4028/www.scientific.net/amr.856.231

[9] P.A. Rometsch, G.B. Schaffer: An age hardening model for Al-7Si-Mg Casting Alloys, Material Science and Engineering A325 (2002), pp.424-434.

DOI: 10.1016/s0921-5093(01)01479-4

[10] G. Dinesh Babu, M. Nageswara Rao: Effect of non-conventional ageing treatments on the tensile properties of cast aluminium alloy 354, GSTF Journal of Engineering Technology, JET Vol. 2 No. 1 (2013).

DOI: 10.5176/2251-3701_2.1.62

[11] N. Afrin, D.L. Chen, X. Cao, M. Jahazi: Strain hardening behaviour of a friction stir welded magnesium alloy, Scripta Materialia 57 (2007), pp.1004-1007.

DOI: 10.1016/j.scriptamat.2007.08.001

[12] M. Tiryakioglu, J. Campbell, J.T. Staley: The influence of structural integrity on the tensile deformation of cast Al-7wt. %Si-0. 6wt. %Mg alloys, Scripta Materialia, 49 (2003), pp.873-878.

DOI: 10.1016/s1359-6462(03)00439-1

[13] L.M. Cheng, W.J. Poole, J.D. Embury and D.J. Lloyd: The influence of Precipitation on the Work-Hardening Behaviour of the Aluminium Alloys AA6111 and AA7030, Metallurgical and Material Transactions A, Vol. 34A (Nov 2003), pp.2473-2481.

DOI: 10.1007/s11661-003-0007-2

[14] A. Bahrami, A. Miroux and J. Sietsma: Modeling of Strain Hardening in the Aluminium Alloy AA6061, Metallurgical and Material Transactions A, Vol. 44A (May 2013), pp.2409-1417.

DOI: 10.1007/s11661-012-1594-6