Abstract
Over these last few years, there has been a growing interest in developing mechanical components from submicrometric materials due to the significant improvement that these materials present compared to their original state. This present research work deals with the study of the mechanical properties of a connecting rod isothermally forged from different starting materials. These materials are as follows: annealed aluminum alloy (AA) 5754, the same alloy previously deformed through equal channel angular pressing (ECAP) and a third case where the previously ECAP-processed material is subjected to a recovery heat treatment. A comparison is made between finite volume (FV) simulations and experimental tests with respect to hardness, plastic strain and forging force. Furthermore, the improvement in the mechanical properties of the connecting rod forged from predeformed material is evaluated in comparison to the connecting rod forged with annealed material. The microstructure of both cases is also compared at the end of the manufacturing process.
Highlights
Over these last few years, there has been a large amount of research work on the application of severe plastic deformation (SPD) processes in order to improve the mechanical properties of materials and to reduce their grain size [1]
Microhardness values obtained in the previous section are plotted using MATLAB® (R2013b, MathWorks, Natick, United States, 1984) in order to be able to compare the pattern attained to the plastic strain calculated from the finite volume simulations [27,28]
Taking into account the mean value of the microhardness measurements for each connecting rod, a value of Hv 89.1 is obtained for the connecting rod forged from the N0 state material and Hv 100.0 in the case of the N2 state with flash treatment
Summary
Over these last few years, there has been a large amount of research work on the application of severe plastic deformation (SPD) processes in order to improve the mechanical properties of materials and to reduce their grain size [1]. The processes that are included in the SPD processes are those thermo-mechanical ones that are able to introduce high plastic strain values (ε >> 1) in the material. Due to this plastic strain introduced in the presence of a high hydrostatic pressure, materials with a submicrometric structure may be obtained in the case of metallic alloys [2]. Other material properties affected by the use of SPD processes are corrosion [5]
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