Effect of Overheating on the Mechanical and Plastic Properties of A390.0 Cast Alloy

Abstract:

The paper presents the results of studies on the effect of the A390.0 (AlSi17Cu5) alloy overheating to a temperature of 920°C and modification with phosphorus (CuP10) on the resulting mechanical (HB, R_m, R_0.2) and plastic (A₅ and Z) properties. It has been shown that, so-called, "time-thermal treatment" (TTT) of an alloy in the liquid state, consisting in overheating the metal to about 250÷300°C above T_liq, holding at this temperature and rapid cooling, refines the structure and improves the mechanical properties. It has also been found that strong overheating of alloy above T_liq "enhances" the process of modification, resulting in the formation of fine-grain structure. The primary silicon crystals uniformly distributed in the eutectic and characteristics of the α (Al) solution supersaturated with alloying elements present in the starting alloy composition (Cu, Fe) provide not only an increase of strength at ambient temperature but also at elevated temperature (250°C), which is of particular importance for the automotive applications, especially as regards cast pistons operating in IC.

• Periodical: Solid State Phenomena (Volume 211)
• Pages: 9-14
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.211.9
• Online since: November 2013
• Authors: Jaroslaw Piątkowski
• Keywords: Hypereutectic Al-Si Alloy, Mechanical Property, Overheating Degree, Plastic Properties

References

[1] C.L. Xu, H.Y. Wang, Y.F. Yang, Q.C. Jiang, Mat. Sci. and Eng. A452-453 (2007), p.341.

[2] N. Natahalla, M. Hafiz, M. Abdulkhalek, J. of Mat. Sci. 34 (1999), p.3555.

[3] S.P. Nikanorov, M.P. Volkov, V.N. Gurin, Y.A. Burenkov, L.I. Derkachenko, B.K. Kardashev, L.L. Regel, W.R. Wilcox, Mat. Sci. and Eng. A390 (2005), p.63.

DOI: 10.1016/j.msea.2004.07.037

[4] V. Flores, J. Lopez, J.C. Escobedo, A.H. Castillejos, F.A. Acosta, Metall. Quarterly 33 (1994), p.133.

[5] C.L. Xu, H.Y. Wang, C. Liu, Q.C. Jiang, Crystal Growth 291 (2006), p.540.

[6] Min Zuo, Xiangfa Liu, Qianqian Sun, J. of Mater. Sci. 44, issue 8, 2009, p. (1952).

[7] Q.C. Jiang, C.L. Xu, M. Lu, H.Y. Wang, Materials Letters 59, 2005, p.624.

[8] Y.T. Pei, J. Th. M. De Hosson, Acta Mater. 49 (2001), p.561.

[9] D.H. Lu, et al., J. Mater. Process. Technol. 189 (2007), p.13.

[10] O. Lashkari, F. Ajersch, Mat. Sci. and Eng. 428, (2008), p.377.

[11] C.L. Xu, H.Y. Wang, F. Qiu, Y.F. Yang, Q.C. Jiang, Mat. Sci. Eng. A 417 (2006), p.275.

[12] J. Piątkowski, Solid St. Phen. 176 (2011), p.29.

[13] J. Piątkowski, Arch. of Foundry Eng. 10, No 2 (2010), p.103.

[14] J. Piątkowski, B. Gajdzik, T. Matuła, Metalurgija 51, No 3 (2012), p.321.

[15] J. Piątkowski, Solid St. Phen. 191 (2012), p.23.

[16] W. Kurz, D.J. Fisher, Fundamentals of Solidification, Trans. Tech. Publ. (1986).