Abstract
To lessen quenching residual stresses in aluminum alloy components, theory analysis, quenching experiments, and numerical simulation were applied to investigate the influence of temperature-dependent material properties on the evolution of plastic strain and stress in the forged 2A14 aluminum alloy components during quenching process. The results show that the thermal expansion coefficients, yield strengths, and elastic moduli played key roles in determining the magnitude of plastic strains. To produce a certain plastic strain, the temperature difference increased with decreasing temperature. It means that the cooling rates at high temperatures play an important role in determining residual stresses. Only reducing the cooling rate at low temperatures does not reduce residual stresses. An optimized quenching process can minimize the residual stresses and guarantee superior mechanical properties. In the quenching process, the cooling rates were low at temperatures above 450 °C and were high at temperatures below 400 °C.
Highlights
Heat-treatable aluminum alloys are widely used to fabricate forged components used in aerospace and aircraft industry for weight reduction
This section will investigate the evolution of plastic strain at Material properties change with temperatures
According to the results to the results and analysis presented in Section 3.1, to produce a certain plastic strain, the temperature and analysis presented in Section 3.1, to produce a certain plastic strain, the temperature difference difference should be increased with decreasing temperatures
Summary
Heat-treatable aluminum alloys are widely used to fabricate forged components used in aerospace and aircraft industry for weight reduction. Solution quenching and aging treatments are applied to the aluminum alloy components to obtain high mechanical properties [1]. For this purpose, fast cooling rates are required to avoid or limit precipitation during the quenching process [2]. Koç et al [9] found that compression and stretching processes could reduce the residual stress of 7050 forged blocks by more than 90%. This technique cannot be used for complicated cross-section components [10]
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