Hot Forming Optimization of ZK30 Magnesium Alloy

Abstract:

The modeling of the forming of materials at high homologous temperatures allows obtaining optimum forming parameters, reduced costs and improving final properties of the finished product. In this work, the behavior of the ZK30 Magnesium alloy was characterized by means of compression tests at temperatures 300 to 450oC and strain rates between 0.1 and 8.7 s^-1. Using data from these tests, the parameters of the Garofalo equation are calculated. In addition, by means of the second Lyapunov stability criterion, the optimum temperature at a given temperature is determined which should minimize the appearance of deformation bands and cracks during hot working. This temperature was found to be 641 K (368oC) at 8.7 s^-1.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 2325-2330
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.2325
• Online since: December 2018
• Authors: Manuel Carsí*, Fernando Carreno, Oscar Ruano
• Keywords: Garofalo Equation, Hot Working, Lyapunov Criteria, Magnesium Alloy

References

[1] G. Mima, Y. Tanaka, Aging characteristics of magnesium-4 wt. percent zinc alloy, Trans. JIM 12 (1971) 71-75.

DOI: 10.2320/matertrans1960.12.71

[2] C. García, M. Carsí, F. Peñalba, M.P. de Andrés, Structure-thermomechanical parameters relationship and Zener-Hollomon equation for two vanadium microalloyed steels, J. Mater. Sci. 27 (1992) 4567-4576.

DOI: 10.1007/bf01165989

[3] M. Carsí, F. Peñalba, I. Rieiro, F. Zapirain, O.A. Ruano, Hot forging of a Cu-Al-Ni-Fe-Mn alloy and its simulation by torsion testing, Z. Metalkd. 91(2000) 1057-1062.

[4] I. Rieiro, O.A. Ruano, M. Eddahbi, M. Carsí, Integral method from initial values to obtain the best fit of the Garofalo´s creep equation, J. Mater. Process. Tech. 78 (1998) 177-183.

DOI: 10.1016/s0924-0136(97)00481-0

[5] M. Carsí, F. Peñalba, I. Rieiro, O.A. Ruano, High temperature workability behaviour of a modified P92 steel, Int. J. Mater. Res. 102 (2011) 1378-1383.

DOI: 10.3139/146.110603

[6] F. Garofalo, An empirical relation defining the stress dependence of minimum creep rate in metals, Trans AIME 227 (1963) 1474-1477.

[7] H.J. McQueen, N.D. Ryan, Constitutive analysis in hot working, Mater. Sci. Eng. A 322 (2002) 43-63.

[8] M. Carsí, F. Peñalba, J. Ibáñez, G. González-Doncel, Prediction of superplastic behavior from high strain rate tests, Mater. Lett. 20 (1994) 119-123.

DOI: 10.1016/0167-577x(94)90072-8

[9] M. Carsí, R. Allende, F. Peñalba, J.A. Jiménez, O.A. Ruano, Simulation of the forming behavior of a boron modified P91 ferritic steel, Steel Res. Int. 75 (2004) 26-32.

DOI: 10.1002/srin.200405922

[10] I. Rieiro, M. Carsı, O.A. Ruano, New numerical method for fit of Garofalo equation and its application for predicting hot workability of (V–N) microalloyed steel, Mater. Sci. Tech. 25 (2009) 995-1002.

DOI: 10.1179/174328408x369429

[11] I. Rieiro, V. Gutiérrez, J. Castellanos, M. Carsí, M. T. Larrea, O.A. Ruano, A new constitutive strain dependent Garofalo equation to describe the high-temperature processing of materials. Application to the AZ31 magnesium alloy, Metall. Mater. Trans. A 41 (2010) 2396- 2407.

DOI: 10.1007/s11661-010-0259-6

[12] I. Rieiro, M. Carsí, O.A. Ruano, A new stability criterion for the hot deformation behavior of materials. Application to the AZ31 magnesium alloy, Metall. Mater. Trans. A 48 (2017) 3445-3460.

DOI: 10.1007/s11661-017-4102-1

[13] I. Rieiro, Estudio y resolución de la ecuación fenomenológica de Garofalo para la fluencia plástica en estado estacionario de materiales metálicos policristalinos. Determinación de su capacidad de aplicación y base física, PhD thesis, Universidad Complutense de Madrid, (1997).

DOI: 10.3989/revmetalm.1998.v34.iextra.771