oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
MODIFIED SHOT PEENING PROCESSES – A REVIEW  [PDF]
Harish Kumar,Pardeep Kumar,Sehijpal Singh
International Journal of Engineering Sciences and Emerging Technologies , 2013,
Abstract: Shot peening is widely used surface modification process to improve the surface characteristics such as hardness, fatigue strength etc. of metal components. But the basic shot peening process cannot be efficiently used for all the materials used for industrial applications. So, modifications in shot peening process are also going on, which can be applied for different material surfaces to improve the surface characteristics. Modified shot peening processes such as microshot peening, water jet peening, oil jet peening, cavitation shotless peening and ultrasonic peening have been successfully used for surface modifications. This paper elaborates the use of these different modified shot peening processes and demonstrates the results obtained by different research scholars on different materials.
Influence of Surface Properties Modified with Fine Shot Peening on Scuffing  [PDF]
Yuya Omiya, Masahiro Fujii, Ryo Ochiai, Koshi Ishimoto, Akihiro Ueda
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2018, DOI: 10.4236/jsemat.2018.83006
Abstract: Recently, gears of high strength, reliability, and surface-damage-resistant under severe service conditions are required to achieve the weight saving and downsizing of a product. For the high-speed condition in particular, it is important to understand the influence of the surface properties on the scuffing resistance. If the effective surface profile to improve the lubrication property was found, the metal surfaces could be obtained with both surface strength and surface lubricity. Herein, the influence of surface properties modified with fine shot peening, which can form the arbitrary surface profile, on the scuffing resistance in the rolling-sliding contact machine element, was investigated. The scuffing test was performed using a two-cylinder rolling contact test machine. In a specific sliding, a faster roller of 60% and a sliding velocity of 1.75 m/s were utilized. The scuffing test results with shot-peened test rollers and those with non-shot-peened test roller were compared. The influence of the surface roughness of the shot-peened test roller was also discussed. We found that the shot-peened roller had a better scuffing resistance compared with the roller without the shot-peening process.
Sliding Wear Behavior of Plasma Sprayed Zirconia Coating on Cast Aluminum against Silicon Carbide Ceramic
Thuong-Hien LE,Young-Hun,Seock-Sam KIM,
Thuong-Hien LE
,Young-Hun CHAE,Seock-Sam KIM

材料科学技术学报 , 2005,
Abstract: The sliding wear behaviors of ZrO2-22 wt pct MgO (MZ) and ZrO2-8 wt pct Y2O3 (YZ) coatings deposited on a cast aluminum alloy with bond layer (NiCrCoAlY) by plasma spray were investigated under dry test conditions at room temperature. Under all load conditions, the wear mechanisms of the MZ and YZ coatings were almost the same.The material transfer and pullout were involved in the wear process of the studied coatings under the test conditions.The wear rate of the MZ coating was less than that of the YZ coating. While increasing the normal load, the wear rates of the MZ and YZ coatings increased. SEM was used to examine the worn surfaces and to elucidate likely wear mechanisms. Energy dispersive X-ray spectroscopy (EDX) analysis of the worn surfaces indicated that material transfer occurred in the direction from the SiC ball to the disk. Fracture toughness had a significant influence on the wear performance of the coatings. It was suggested that the material transfer played an important role in the wear behavior.
EFFECT OF SHOT PEENING ON FATIGUE PROPERTIES OF STEEL IN DIFFERENT STRUCTURAL STATES
Gejza Rosenberg
Materials Engineering , 2011,
Abstract: The aim of this paper is to evaluate the effect of shot peening on fatigue properties of dual-phase steels DP 600 in received condition, as well as in condition after different regimes of heat treatment. In the work, there are presented results of tests on smooth samples as well as on samples with stress concentrator (a drilling hole, size d = 4mm). The expectations, that shot peening of flat steel samples improves resistance to fatigue failure, were approved by all tested structural states. The tests on samples with the drilled hole showed, that effect of shot peening on fatigue properties may be negative, if the hole was drilled after shot peening of surface of samples.
Effect of shot peening process on fatigue behavior of an alloyed austempered ductile iron  [PDF]
Amir Sadighzadeh Benam,Sasan Yazdani,Behzad Avishan
China Foundry , 2011,
Abstract: Shot peening is one of the most common surface treatments to improve the fatigue behavior of metallic parts. In this study the effect of shot peening process on the fatigue behavior of an alloyed austempered ductile iron (ADI) has been studied. Austempering heat treatment consisted of austenitizing at 875℃ for 90 min followed by austempering at three different temperatures of 320, 365 and 400℃. Rotating-bending fatigue test was carried out on samples after shot peening by 0.4 – 0.6 mm shots. XRD and SEM analysis, micro hardness and roughness tests were carried out to study the fatigue behavior of the samples. Results indicate that the fatigue strengths of samples austempered at 320, 365 and 400℃ are increased by 27.3%, 33.3% and 48.4%, respectively, after shot peening process.
SHOT-PEENING STRENGTHENED LAYER AND ITS EFFECT ON FATIGUE STRENGTH OF α-BRASS
TAN Yuxu REN Liping LI Gang Xi''''an Jiaotong University,Xi''''an,China Institute of Metallic and Strength,Xi''''an Jiaotong University,Xi''''an,China
金属学报(英文版) , 1989,
Abstract: In shot peened α-brass surface layer{111} type planar defects and deformation microtwinshave been observed by means of TEM analysis.The density of microtwins deereases with theincrease of layer depth.The enhancement of fatigue strength and the unrelaxation of residualstress after shot peening are concerned in the substructures of strengthened layer.
Influence of Shot Peening on DIN 1.2714 Hot Work Tool Steel  [PDF]
Valmik Bhavar, Sachin V. Patil, Prakash Kattire, P. P. Date, R. K. P. Singh
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.51012
Abstract:
Shot peening is one of the most popular surface enhancement technique used to improve fatigue performance of different materials. This paper focuses on to study the effect of different shot peening parameters on micro-structural and mechanical properties of DIN 1.2714 tool steel specimens. Shot peening treatments were carried out by varying shot size and peening intensity. X-ray stress analysis, micro-hardness testing and micro-structural analysis were performed to characterize these specimens. In addition, pin on disk wear testing was executed to recognize wear behavior of this shot peened tool steels. It was observed that along with compressive residual stress generation, shot peening also induces work hardening effect and modifies surface structure which are responsible for significant improvement in this tool steel.
Effect of shot peening on hardening and surface roughness of nitrogen austenitic stainless steel  [PDF]
LAKHWINDER SINGH,R.A. KHAN,M.L. AGGARWAL
International Journal of Engineering Science and Technology , 2010,
Abstract: Austenitic stainless steel cannot be hardened by heat treatment. It is usually annealed, followed by cold working for improving hardness. Nitrogen is a strong austenitic forming and stabilizing element and is a strong solid solution strengthener. The amount of nitrogen contained in an austenitic stainless steel affects its properties significantly. The fatigue strength and corrosion resistance are improved by inducing nitrogen in the austenitic stainless steel. In this paper, shot peening of nitrogen austenitic stainless steel (RS561) has been done to study its effects on hardness, fatigue strength, compressive residual stress and surface roughness. The emphasis in this paper is focused on the change in hardness, fatigue strength and surface roughness of nitrogen austenitic stainless steel by primary shot peening and double shot peening.
Ensuring uniformity of strengthening for machine parts surfaces by shot-peening  [PDF]
Z.A. Stotsko,T.O. Stefanovych
Journal of Achievements in Materials and Manufacturing Engineering , 2010,
Abstract: Purpose: of this paper is developing the mathematical models of shot-peening, in which is reflected moving shot-peening head or machine parts surfaces during treating that will achieve uniformity of treatment machine parts.Design/methodology/approach: The main methods used for the theoretical research are mathematical modelling, integral calculus, fundamentals of analytic geometry, probability theory. It is used approved enough and well known numerical methods for calculations after mathematical models.Findings: Method of mathematical modeling for shot-peening is developed based on the energy conception. Mathematical model in which is reflected moving shot-peened head or machine parts surfaces during treating is created. It allows forecasting the characteristics of surface quality depending on the technological modes of treatment.Research limitations/implications: It is planned developing and improving the methods of shot-peening mathematical modeling in future research by extending theirs for the curvilinear treated surfaces, which has movement relative to the nozzle of shot-peening head after the different laws of motion, and for different kinds of materials, especially for metal joint endoprosthesis biomaterials.Practical implications: has the applied software, elaborated on the basis of the models, that allows providing for automation of calculations of the characteristics of surface quality depending on the technological modes of treatment.Originality/value: It is pioneered receiving functional dependences in which is reflected moving shot-peened head or machine parts surfaces during treating. Created functional dependences takes into account the distribution of characteristics of working medium (mass and velocity) all along the cross-sections of shot blast.
Granular gases in mechanical engineering: on the origin of heterogeneous ultrasonic shot peening  [PDF]
M. Micoulaut,S. Mechkov,D. Retraint,P. Viot,M. Francois
Physics , 2005,
Abstract: The behavior of an ultrasonic shot peening process is observed and analyzed by using a model of inelastic hard spheres in a gravitational field that are fluidized by a vibrating bottom wall (sonotrode) in a cylindrical chamber. A marked heterogeneous distribution of impacts appears when the collision between the shot and the side wall becomes inelastic with constant dissipation. This effect is one order of magnitude larger than the simple heterogeneity arising from boundary collision on the cylinder. Variable restitution coefficients bring the simulation closer to the general observation and allows the investigation of peening regimes with changing shot density. We compute within this model other physical quantities (impact velocities, impact angle, temperature and density profile) that are influenced by the number $N$ of spheres.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.