Experimental study of the effects of constrained groove pressing process on AA6061 sheet

Articles in Press

Document Type : Original Article

Authors

1 Mechanical Engineering Department, University of Birjand, Birjand, Iran, Iran. * P.O.B. 97175/615, Birjand, Iran

2 Mechanical Engineering Department/ Birjand University of Technology

3 Birjand University of Technology

10.22034/ijme.2024.433980.1895

Abstract

In line with the need of various industries for materials with a high strength-to-weight ratio, the use of severe plastic deformation (SPD) methods has become particularly important. The constrained groove pressing (CGP) process is one of the most effective methods of SPD to produce metal sheets with a very fine grain structure. In this research, the effect of CGP process on aluminum alloy 6061 sheet has been studied experimentally. Therefore, in this direction, the CGP process was carried out experimentally up to two complete passes. After the process, in order to evaluate the mechanical properties of the deformed sheets, tensile and microhardness tests were performed, and the microstructure of the sheets was studied using optical microscope images. The results showed that the average hardness in the first pass has increased by 41.7% and 48.9% in the direction of length and thickness, respectively. Similarly, in the second pass, the average hardness in the direction of length and thickness has increased by 52.7 and 58.9 percent compared to the initial sheet. Also, the tensile test results showed that the CGP process increased the yield strength by 150% in the second pass. The results of microstructural studies showed that the grain size in the CGP process decreases during two passes. Of course, the amount of grain size reduction in the second pass is less than the first pass. In addition, it was observed that the decrease in the average grain size in the thickness direction is greater than in the longitudinal direction.

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Iranian Journal of Manufacturing Engineering

Articles in Press, Accepted Manuscript
Available Online from 13 February 2024

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