scholarly journals Ultrasonic Pulsating Water Jet Peening: Influence of Pressure and Pattern Strategy

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6019
Author(s):  
Gabriel Stolárik ◽  
Akash Nag ◽  
Jana Petrů ◽  
Jaroslava Svobodová ◽  
Sergej Hloch
Keyword(s):  
Surface Roughness ◽  
Surface Treatment ◽  
Water Jet ◽  
Water Droplets ◽  
Research Attention ◽  
Subsurface Layers ◽  
Thermal Influence ◽  
Pulsating Water Jet ◽  
Clear Increase ◽  
Mechanical Surface

Peening techniques are nowadays attracting more research attention due to their association with the extending of the service life and improving surface texture of engineering components. Ultrasonic pulsating water jet peening represents a new way of mechanical surface treatment. Accelerated water droplets via hammer effect cause small elastic-plastic deformations on the surface. This work deals with peening of aluminum alloy using an ultrasonic pulsating water jet, where periodically acting water droplets were used as the peening medium. The aim of the work was the feasibility study of the peening process and to observe the effects of pressure (p = 10, 20 and 30 MPa) and pattern trajectory (linear hatch and cross hatch). The peened surfaces were analyzed by the surface roughness profile parameters Ra and Rz and the microhardness along the peening axis into the material. Graphically processed results show a clear increase of measured values with increasing pressure (p = 10, 20 and 30 MPa), where the roughness values ranged from 1.89 µm to 4.11 µm, and the microhardness values ranged from 43.3 HV0.005 to 47 HV0.005, as compared to 40.3 HV0.005 obtained for the untreated sample. The achieved results indicate potential using of an ultrasonic pulsating water jet as a new method of surface treatment of metals. By controlled distribution of water droplets, it is possible to achieve a local distribution of surface roughness, and at the same time, strengthening of the subsurface layers in the material without thermal influence on the material.

scholarly journals Comparison of advanced techniques for mechanical surface treatment of stainless steel parts

2021 ◽  
Author(s):  
Dmytro Lesyk ◽  
S. Soiama ◽  
B. Mordyuk ◽  
Vitaliy Dzhemelinskyi ◽  
A. Ламікіз
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Treatment ◽  
Surface Hardness ◽  
Water Jet ◽  
Surface Microrelief ◽  
Near Surface ◽  
Treatment Techniques ◽  
Mechanical Surface Treatment ◽  
Mechanical Surface

This work compares various mechanical surface treatment techniques applied to improve the properties of the AISI 304 austenitic stainless steel. Effects of laser shock peening (LSP), water jet cavitation peening (WjCP), water jet shot peening (WjSP), and ultrasonic impact treatment (UIT) on surface roughness, hardness, and residual stress were studied. The results demonstrate that as compared to the untreated specimen (Ra = 3.06 μm), all strain hardening methods demonstrate the decreased surface roughness parameters. The smallest Ra parameter of the wavy regular surface microrelief is formed after the ultrasonic treatment. The surface hardness (22.1 HRC5) was respectively increased by 30.7%, 38.4%, 69.6%, and 73.2% after the LSP, WjCP, WjSP, and UIT treatments. All peening techniques induced compressive residual stresses (ranged from –377 MPa to –693 MPa) in the near-surface layer. It is assumed that used treatments can increase wear/corrosion resistance and fatigue life in the studied steel.

Surface Treatment of AISI 304 Using Pulsating Water Jet Peening

2017 ◽  
pp. 535-548 ◽  
Author(s):  
Madhulika Srivastava ◽  
Rupam Tripathi ◽  
Sergej Hloch ◽  
Ayush Rajput ◽  
Drupad Khublani ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Water Jet ◽  
Aisi 304 ◽  
Pulsating Water Jet

Mechanical Surface Treatment Technologies for Improving HCF Strength and Surface Roughness of Blisk-Rotors

2013 ◽  
Vol 768-769 ◽  
pp. 510-518 ◽  
Author(s):  
Goetz G. Feldmann ◽  
Thomas Haubold
Keyword(s):  
Surface Roughness ◽  
Surface Treatment ◽  
High Efficiency ◽  
Mechanical Surface Treatment ◽  
High Durability ◽  
Treatment Technologies ◽  
Hcf Strength ◽  
The Individual ◽  
Mechanical Surface ◽  
Insight Into

The manufacturing of electron beam welded blade integrated disk (blisk) rotors sets new demands on mechanical surface treatment technologies. High durability and high efficiency of the blades are in general strict requirements for the component and have ideally to be increased by a mechanical surface treatment. The high complex 3D shape of the blades and the need to treat the blades on the rotor caused by a post weld heat treatment are additional challenges to solve. Limited clearance between the blades and low space between the individual blisk’s increase as well the requirements on the technology. Conventional technologies reach their limits and have to be improved. This paper gives an insight into the capabilities of different mechanical surface treatments regarding the treatment of blades on blisk-rotors. Compared with the benchmark shot peening, surface roughness, residual stress depth distribution and high cycle fatigue (HCF) are investigated on deep rolled and vibropeened specimen. Assets and drawbacks are shown and discussed.

Numerical assessment of pulsating water jet in the conical diffusers

2017 ◽  
Author(s):  
Constantin Tanasa ◽  
Tiberiu Ciocan ◽  
Sebastian Muntean
Keyword(s):  
Water Jet ◽  
Numerical Assessment ◽  
Pulsating Water Jet

Study on carbon epoxy composite surfaces machined by abrasive water jet machining

2018 ◽  
Vol 53 (20) ◽  
pp. 2909-2924 ◽  
Author(s):  
Ajit Dhanawade ◽  
Shailendra Kumar
Keyword(s):  
Surface Roughness ◽  
Composite Material ◽  
Process Parameters ◽  
Surface Finish ◽  
Epoxy Composite ◽  
Water Jet ◽  
Machining Parameters ◽  
Abrasive Water Jet ◽  
Abrasive Water Jet Machining ◽  
Pull Out

Traditional machining of carbon epoxy composite material is difficult due to excessive tool wear, excessive stresses and heat generation, delamination, high surface waviness, etc. In the present paper, research work involved in the experimental study of abrasive water jet machining of carbon epoxy composite material is described. The aim of present work is to improve surface finish and studying defects in machined samples. Taguchi's orthogonal array approach is used to design experiments. Process parameters namely hydraulic pressure, traverse rate, stand-off distance and abrasive mass flow rate are considered for this study. Analysis of machined surfaces and kerf quality is carried out using scanning electron microscope to evaluate microscopic features. Further, the effect of machining parameters on surface roughness is investigated using analysis of variance approach. It is found that traverse rate and pressure are most significant parameters to control surface roughness. Optimization of process parameters is performed using grey relational analysis. Thereafter, confirmation tests are carried out to verify the improvement in the surface quality with optimum set of process parameters. It is found that surface finish of machined samples is improved by 10.75% with optimum levels of process parameters. Defects like delamination, fiber pull-out and abrasive embedment are also studied using SEM. It is observed that delamination and fiber pull-out are prominent in samples machined at low pressure and high traverse rate.

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