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The Search for Reliable Inputs in Modelling Hot Working Operations: A Model Describing the Flow Behavior of Metals at High Temperature Applied to CW602N Brass

100%

El Mehtedi M., Spigarelli S.

Acta Physica Polonica A

2015

vol. 128

issue 4

722-725

Finite element modeling allows the optimization of metalworking processes and enhances the quality of the product, in terms of properties and microstructure, as attested by the success of recent finite element modeling codes in simulating the microstructural evolution during hot deformation. Hot working of metals involves several concurring phenomena; in particular, dynamic and static recrystallizations depend on the energy stored in the grains during and after deformation, i.e. on the strain accumulated in the material. As a result, the correct estimation of the accumulated strain plays a crucial role in modelling the final microstructure. A new constitutive model based on the combination of the Garofalo and Hensel-Spittel equations has been thus recently proposed to describe the plastic flow behavior of an aluminum alloys. The new equation was used in the present paper to model the equivalent stress vs. equivalent strain curved obtained by testing in torsion between 550 and 700°C a CW602N (Cu-36%Zn-2%Pb-As) brass. Interpolation of the experimental data using the constitutive model resulted in an excellent description of the flow curves, thus demonstrating that the combined use of the new equation and of torsion testing can be safely adopted in a computer code to simulate forging or extrusion.

Characterization of Hot Deformation of CW602N Brass

81%

Spigarelli S., El Mehtedi M., Cabibbo M.

Acta Physica Polonica A

2015

vol. 128

issue 4

726-729

Alpha brasses (in principle single-phase solid solution alloys containing less than 35% Zn) are usually processed by extrusion, forging or rolling. Although these materials are of widespread use, few detailed studies of the flow behavior of brass at high temperature are available. The hot workability of a CW602N brass (Cu-36.5%Zn-2%Pb) was thus investigated by torsion testing in the temperature range between 550 and 800°C, under equivalent strain rates ranging from 0.01 to 10 s^{-1}. The peak flow stress dependence on temperature and strain rate was described by the well-known Garofalo equation, with a stress exponent close to 4 and Q=220 kJ mol^{-1}. A considerably larger scatter of the experimental data was observed in the high temperature range. The detailed microstructural analysis of the deformed samples by scanning electron microscopy revealed substantial differences among the samples deformed in the low temperature regime and those torsioned at 750 and 800°C. These differences were analyzed and discussed to rationalize the different mechanical responses observed in the two hot-deformation regimes.

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2 Acta Physica Polonica A

2 2015

2 El Mehtedi M.

2 Spigarelli S.

1 Cabibbo M.

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The Search for Reliable Inputs in Modelling Hot Working Operations: A Model Describing the Flow Behavior of Metals at High Temperature Applied to CW602N Brass

Characterization of Hot Deformation of CW602N Brass