Topic
Peening
About: Peening is a research topic. Over the lifetime, 5538 publications have been published within this topic receiving 73073 citations.
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15 Apr 2011-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the distribution of residual stresses and microstructure after shot peening was investigated and the domain sizes and the microstrain of surface deformation layers were calculated from the full width at half maximum of Ti peak.
Abstract: Titanium matrix composites reinforced with TiB and TiC are fabricated by in situ technology. The distribution of residual stresses and microstructure are investigated after shot peening. The domain sizes and the microstrain of surface deformation layers are calculated from the full width at half maximum of Ti (2 1 3) peak. The results reveal that both compressive residual stresses and microhardness increase with the improvement of shot peening intensity in the surface deformation layers. And the domain sizes are refined and the microstrain become severely in surface layers after shot peening. In the progress of investigation, it is found that these variations are influenced by both the volume percentages of reinforcements and shot peening intensities. Comparing to the reinforcements, the effects of SP intensities were distinct and dominate.
44 citations
TL;DR: In this article, a plate of bulk metallic glass Zr55Ti5Al10Cu20Ni10, shot-peened on both faces, has been studied by synchrotron X-ray diffraction in transmission and the elastic strain in the plate interior is measured and the compressive stress profile in the peened surfaces is estimated.
Abstract: A plate of bulk metallic glass Zr55Ti5Al10Cu20Ni10, shot-peened on both faces, has been studied by synchrotron X-ray diffraction in transmission. The ellipticity in the first diffraction halo changes throughout the plate thickness. The elastic strain in the plate interior is measured and the compressive stress profile in the peened surfaces is estimated. Structural anisotropy and dilatation induced by plastic deformation preclude direct measurement of the elastic strain in the peened layers. Plastic deformation induces softening, but changes in the elastic properties remain undetermined.
43 citations
TL;DR: In this paper, the effects of shot peening on microstructure, mechanical properties, fatigue behavior, and residual stress relaxation of AISI 1060 steel were investigated by means of XRD measurements.
Abstract: This study investigates and compares the effects of different shot peening treatments including conventional and severe shot peening on microstructure, mechanical properties, fatigue behavior, and residual stress relaxation of AISI 1060 steel. Shot peening treatments were applied with two Almen intensities of 17 and 21 A and a wide ranges of coverage (100%–1500%). Various microstructural observations were carried out to analyze the evolution of microstructure. Microhardness, residual stress and surface roughness measurements and also axial fatigue test were performed. Moreover, the extent of the residual stress relaxation during cyclic loading was investigated by means of XRD measurements. Furthermore, numerical simulation of residual stress relaxation due to fatigue loading was carried out and validated against experimental investigations. The comparison indicated a good agreement for the surface residual stress relaxation up to 100 cycles. The experimental results indicated the efficiency of severe shot peening processes in obtaining nanostructured surface layer and achieving superior mechanical properties and fatigue behavior. Also, residual stress measurements revealed that stress relaxation started with a high rate at the initial stages of loading and gradually increased at higher number of cycles which was lower in the case of severely shot peened samples compared to the conventionally treated ones.
43 citations
TL;DR: A three step numerical model that can simulate stress peening forming and shows that the prebending moments have an influence not only on the residual stress profiles but also on the curvatures of the deformed component in chordwise and spanwise directions is developed.
43 citations
TL;DR: In this paper, a 3D multi-impact finite element (FE) model for evaluation of peening residual stress is presented, where combined peening factors by Kim et al. are applied to the 3D symmetry-cell originally contrived by Meguid et al., and the authors successfully extracted the equi-biaxial stress from the simulations of diverse single-cycle and multi-cycle impacts.
Abstract: A 3D multi-impact finite element (FE) model for evaluation of peening residual stress is presented. Combined peening factors by Kim et al. are applied to the 3D symmetry-cell originally contrived by Meguid et al. To describe the feature of multi-impacts, concepts such as FE peening coverage, impact sequence and cycle-repetition are introduced. We successfully extracted the equi-biaxial stress from the simulations of diverse single-cycle and multi-cycle impacts. At four impact locations of FE symmetry-cell, surface and maximum residual stresses converge to equi-biaxial stress, and convergence improves with the number of repetitions of cycle. Impact velocity needed for comparing the FE solution with the XRD result is determined from the Almen arc height and coverage. It is further found that the simulation set with plastic shot produces residual stress consistent with the experimental XRD result.
43 citations