Numerical Calculation of Particles Velocity under the Compressible Fluid in Fine Particle Bombardments(Machine Elements, Design and Manufacturing)

Nanbu, Koichiro; Ito, Kenichi; Egami, Noboru

doi:10.1299/kikaic.76.3728

Cited by 14 publications

(8 citation statements)

References 3 publications

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“…15) In contrast, the 4 mm nozzle required that the compressibility of the gas be considered. A theoretical calculation gave a value for the gas velocity at the tip of the nozzle of 314 m/ s 16) , although a more accurate value could be obtained from numerical analysis, which considers the effect of viscosity.…”

Section: Specimen Preparationmentioning

confidence: 99%

Effects of Gas Blow Velocity on the Surface Properties of Ti-6Al-4V Alloy Treated by Gas Blow IH Nitriding

et al. 2017

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In the present study, gas blow IH (Induction Heating) nitrided specimens were produced under variable nitrogen gas blowing velocities. This was done to investigate the effects of nitrogen gas velocity on the surface properties of Ti-6Al-4V alloy. The surface properties of the specimens were characterized using X-ray diffraction, scanning electron microscopy, a micro-Vickers hardness tester and nano-indentation tester. The results showed that the surface hardness and thickness of the hardened layer increased with increasing gas blowing velocity. This occurred because of the elevated temperatures in the interior of the alloy relative to the surface temperatures at a higher gas blowing velocity. Furthermore, increasing the magnetic eld strength around the IH coil and the eddy current density around the circumference of the specimen also accelerated the formation of a hardened layer on the surface of the titanium alloy. Consequently, a high-hardness layer can be formed by applying a treatment temperature less than the β transus of the Ti-6Al-4V alloy, while increasing the gas blowing velocity. This layer improves the wear resistance of the alloy by suppressing both grain coarsening and the formation of an acicular α phase.

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Section: Specimen Preparationmentioning

confidence: 99%

Effects of Gas Blow Velocity on the Surface Properties of Ti-6Al-4V Alloy Treated by Gas Blow IH Nitriding

et al. 2017

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“…In order to clarify the reason for this, the velocity of the shot particles was analyzed based on the model that the authors' research group has proposed [20,21]. In our numerical calculation, the velocity of shot particles with various diameters through a convergent nozzle was analyzed from the following formula (1), in assuming that the air passing through the nozzle was considered as a compressible fluid.…”

Section: Effect Of Shot Particle Diameter On the Surface Microstructumentioning

confidence: 99%

“…Yonekura et al [1] reported that the fatigue strength of FPP treated ferrite-pearlite steel was higher than that of the same material treated with conventional shot peening due to the generation of higher and more stable compressive residual stress on the 4 treated surface. Moreover, FPP is very effective for creating fine crystal grains [15,16,18,19] because the particle velocity in FPP is higher than that in conventional shot peening [17,20,21].…”

Section: Introductionmentioning

confidence: 99%

Effect of shot peening using ultra-fine particles on fatigue properties of 5056 aluminum alloy under rotating bending

Kikuchi

Nakamura

Nambu

et al. 2016

Materials Science and Engineering: A

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“…Thus, air velocity in the potential core region, Up (9) y Then, we calculate the theoretical value of the particle velocity solved numerically Eq. (1) by the Runge-Kutta method [8].…”

Section: N Nozzle Exitmentioning

confidence: 99%

OS0201 Observation of particle behavior in Fine Particle Peening process

Aiba

Omiya²

2014

The Proceedings of the Materials and Mechanics Conference

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In this paper, we focused on the particle velocities of fine particle peening process (FPP) and measured them by a high-speed camera. Also, we developed the theoretical model of particle motions with the effect of jet flow and calculated the particle velocities after spouting from the nozzle. Then, we compared the experimental results with the calculated results, and those agreed well each other. It is concluded that the particle velocity can be estimated by our prposed model and it is helpful information for understanding the surface modification in fine particle peening (FPP) process.

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Numerical Calculation of Particles Velocity under the Compressible Fluid in Fine Particle Bombardments(Machine Elements, Design and Manufacturing)

Cited by 14 publications

References 3 publications

Effects of Gas Blow Velocity on the Surface Properties of Ti-6Al-4V Alloy Treated by Gas Blow IH Nitriding

Effects of Gas Blow Velocity on the Surface Properties of Ti-6Al-4V Alloy Treated by Gas Blow IH Nitriding

Effect of shot peening using ultra-fine particles on fatigue properties of 5056 aluminum alloy under rotating bending

OS0201 Observation of particle behavior in Fine Particle Peening process

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