Mechanical surface modification such as shot peening offer powerful enhancement of fatigue properties metals and other materials. Cavitation usually causes damage in hydraulic machineries. However, careful selection process parameters allowed developing an approach known “cavitation peening.” Its advantage is roughness increase lower than conventional there are no solid collisions involved. As ...

Peening intensity and coverage are vital measurement outputs to quantify the quality of a peening process in surface enhancement operation metal parts. In practice, these parameters can only be measured offline upon completion, which is not suitable for online tracking operation. Instead, shot stream velocity used as real-time monitoring parameter bridge operational inputs outputs. As such, rob...

Plain bend bars made from FV566 martensitic stainless steel were extracted the root of ex-service power plant turbine blades and several industry-relevant notch geometries introduced. Some samples shot peened. The notched loaded plastically in low-cycle fatigue regime finite element (FE) modeling carried out to investigate effects changing geometry, combined with peening, on behaviors such as c...

Remanufacturing has become popular as a system for reducing CO2 emissions caused by the life cycle of products. Therefore, producing more components via remanufacturing is important. Shot peening can be used to render surface defects harmless owing compressive residual stress effects. This study investigated effects shot means gears. In this study, carburized steel specimens containing artifici...

One factor that plays an important role in the aerodynamic performance of aeroengines is shape blades, which vulnerable to change resulting from plastic deformation and residual stresses induced by complex manufacturing processes, especially shot peening. However, few studies were focused on detailed strategies peening profile superposition effects during entire processes. In this paper, based ...

Photon Induced Positron Annihilation (PIPA) and related portable technologies’ have demonstrated their ability to nondestructively quantify shot peening/surface treatments and relaxation effects in single crystal superalloys and steels with a single measurement as part of a National Science Foundation SBIR program. PIPA measurement of surface treatment effects provides a demonstrated ability to...

One of the traditional methods used to improve fatigue properties metallic materials is shot peening. More recently, cavitation peening, in which surface treated using impact, has been developed, and improvements this makes life strength have reported. In order clarify difference between these two methods, stainless steel SUS316 L samples were by peening evaluated utilizing a displacement contr...

Purpose This study aims to investigate the effect of mechanical peening on cooling rate a subsequently deposited layer in hybrid additive manufacturing (AM) process. Design/methodology/approach In this experimental study, 20 layers 316 L stainless steel are built via directed energy deposition, with tenth being subject various processes (shot peening, hammer and laser shock peening). The micros...

Shot-peening treatment was applied to a quenched and tempered DIN 34CrNiMo6 steel improve its high-cycle R: −1 axial fatigue strength. Compared with the machined condition, increase in limit 21.8%. S-N curves for shot-peened as condition were presented compared those obtained previous research rotating bending fatigue, including mirror-polished specimens. The shot-peening this work (Isp: 8A 200...

A COUPLED CREEP-PLASTICITY MODEL FOR RESIDUAL STRESS RELAXATION OF A SHOT-PEENED NICKEL-BASE SUPERALLOY Name: Dennis Justin Buchanan University of Dayton, 2007 Advisor: Dr. R. A. Brockman Shot peening has been employed in numerous industries for decades to impart beneficial compressive residual stresses on the surface of metal components. Compressive residual stresses retard initiation of surfa...