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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TL;DR: In this article, shot peening and surface mechanical attrition treatment (SMAT) are compared experimentally, for the first time, using depth profile X-ray diffractometry, and the results can have important implications for improving the fatigue life and wear resistance of metals in the future.
62 citations
25 May 2003-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the authors measured the residual stress with depth from the surface in laser peened coupons made of a high-strength aluminum alloy and found that the residual stresses adjacent to the peened area were compressive.
Abstract: This paper reports measurements of the distribution of residual stress with depth from the surface in laser peened coupons made of a high-strength aluminum alloy. Residual stresses were measured using slitting (also known as the crack compliance method). Measurements were made on several coupons to: compare laser peening (LP) and shot peening (SP) residual stresses; ascertain the influence of LP parameters on residual stress; determine whether tensile residual stress existed outside the peened area; assess the variation of residual stress with in-plane position relative to the layout of the laser spots used for peening; and, determine the importance of a uniform spatial distribution of laser energy within the spot. Residual stress 0.1 mm from the surface due to LP and SP were comparable and the depth of the compressive stress for LP was far greater than for SP. Variations of most LP parameters did not significantly alter residual stress at shallow depths, but greater laser energy and larger layer overlap increased residual stress at depths between 0.2 and 0.6 mm from the surface. Residual stresses adjacent to the peened area were found to be compressive. Decreased levels of surface residual stress were found when laser spots had a non-uniform distribution of laser intensity.
62 citations
TL;DR: In this article, contact fatigue resistance has been tested in a roller to roller rig with finite slip and impurities in the lubricant, and two case hardened alloys were included in the study, different sequences of carburising and grinding and finally additional shot peening.
62 citations
TL;DR: AWJ peening may serve as a new method of surface treatment for metal orthopedic implants, which supports the development of stable primary fixation and simultaneously enhances the component fatigue strength.
Abstract: Abrasive waterjet (AWJ) peening is a new mechanical surface treatment process envisioned for use on metal orthopedic implants. The process utilizes an abrasive waterjet to simultaneously texture and work harden the surface of a metal substrate through controlled hydrodynamic erosion. In this study, a titanium alloy (Ti6Al4V) was subjected to AWJ peening over a range of parametric conditions. The textured surfaces were quantified in terms of the apparent interdigitation volume (Vi), the effective stress concentration factor ( Kt) posed by the surface topography, and the magnitude of residual stress (sr). Topographical features of the prepared surfaces were determined using contact profilometry, and X-ray diffraction was used in evaluating the in-plane residual stress. It was found that a large range in Vi (9.4 - 43.8 mm 3 /mm 2 ) and Kt (1.3-2.7) are available through selection of the AWJ peening process parameters. Furthermore, a compressive residual stress (2409 6 sr 62 33) was found to result within the surface of the Ti6Al4V substrates regardless of treatment condi- tions. When compared to a titanium plasma spray coating used for cementless fixation, the AWJ peened Ti6Al4V exhibited a surface topography with significantly lower effective stress concentration and higher compressive residual stress. Based on results from this study, AWJ peening may serve as a new method of surface treatment for metal orthopedic implants, which supports the development of stable primary fixation and simultaneously enhances the com- ponent fatigue strength. © 2000 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 53: 536 -546, 2000
62 citations
18 Jun 2015-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the weld joint of 304 stainless steel is treated with high energy shot peening (HESP) with various shot-peening pressures, and the grain size and metallographic microstructure of the specimen surface layer are analyzed using the X-ray diffraction method, and surface hardness is measured.
Abstract: The weld joint of 304 stainless steel is treated using high energy shot peening(HESP) with various shot peening pressures. The grain size and metallographic microstructure of the specimen surface layer are analyzed using the X-ray diffraction method, and the surface hardness is measured. Slow strain rate tension tests are then performed to investigate the effect of shot peening pressure on the stress corrosion sensitivity. The results show that in the surface layer of the specimen, the grain refinement, hardness and the strain-induced plastic deformation all increase with the increasing shot peening pressure. Martensitic transformation is observed in the surface layer after being treated with HESP. The martensite phase ratio is found to increase with increasing shot peening pressure. The result also shows that the effects of the shot peening treatment on the stress corrosion sensitivity index depend on the shot peening pressure. When the shot peening pressure is less than 0.4 MPa, the grain refinement effect plays the main role, and the stress corrosion sensitivity index decreases with the increasing shot peening pressure. In contrast, when the shot peening pressure is higher than 0.4 MPa, the martensite transformation effect plays the main role, the stress corrosion sensitivity index increases with increasing shot peening pressure.
62 citations