Investigation of through thickness residual stress distribution in equal channel angular rolled Al 5083 alloy by layer removal technique and X-ray diffraction

Abstract

The layer removal technique and the x-ray diffraction method have been employed to evaluate the residual stresses through the thickness of aluminium alloy 5083 processed by equal channel angular rolling (ECAR). ECAR is a severe plastic deformation process that introduces shear deformation to sheet metals. The process has been completed on 2 mm thick strips passed three times through die channels in a continuous manner. In this work, the profile of residual stresses was quantitatively determined. It was observed that after ECAR process, the residual stress magnitudes were changed from approximately zero in annealed condition up to half of the yield strength value of ECARed samples. The distribution of the residual stresses was found to be non-uniform through the thickness and the ECARed sample was compressive at the top surface while it was tensile at the bottom surface.2 Keywords: Non-ferros metals and alloys (A), X-ray analysis (G), Elastic behaviour (F).

Quantification of residual stresses in multi-pass welds using neutron diffraction

“…A range of experimental techniques were developed for the measurement of residual stresses and used by different investigators (Javadi andNajafabadi, 2013), ultrasonic, (Sattari-Far andFarahani, 2009), hole drilling, (Mahmoodi et al, 2012), layer removal techniques, (Withers and Bhadeshia, 2001), X-ray and (Pardowska et al, 2008), neutron diffractions. However, as pointed out by Paradowska et al (2006) the latter technique (neutron diffraction) allows the measurement of residual stresses for most metals and alloys with an effective depth of measurements up to several centimetres, which covers many practical applications including multi-pass welding as the theme of the current report.…”

Microstructural and Mechanical Study of the Al–20Sn (mass%) Alloy Processed by Equal-Channel Angular Pressing by Route C

“…25) Remarkably low levels of residual stress and microstrain, despite the 5 ECAP passes were observed when compared to other SPD studies on Al based alloys. 26,27) This suggests an important role of Sn to limit the elastic energy stored after each ECAP pass. From previous studies, with lower content of Sn, and the results presented in this work, it is thought that additions above 20 mass% of this element would be detrimental to the refinement effect produced by the ECAP, since the energy generated during the process will not generate the formation of subgrains, as this energy will be partly or mostly absorbed and dissipated by Sn.…”

Deformation Heterogeneity Study of a 6061-T6 Aluminum Alloy Processed by Equal Channel Angular Pressing

“…The results of such analysis can determine the geometry that could provide the lowest inhomogeneity coefficient, preserving a good relationship with a high shear deformation [8,9]. Besides, the determination of the residual stress state, in the vicinity of the die walls and the core of the sample, is highly pertinent [10][11][12], as the friction effects significantly change the microdeformations.…”