Water Jet Shot Peening Strengthening Surface Roughness

2013 ◽  
Vol 670 ◽  
pp. 174-179 ◽  
Author(s):  
X. Dong ◽  
R.Z. Guo ◽  
S.W. Song ◽  
C.Y. Zhuo
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Shot Peening ◽  
Water Jet ◽  
Target Distance ◽  
Material Surface ◽  
Material Strength ◽  
Scanning Velocity ◽  
Alloy Material ◽  
Pressure Nozzle

Shot peening pressure, nozzle scanning velocity, and target distance were chosen as effect factors when shot peening test to 45 steel and 2Al1 aluminum alloy material was made by water jet. Adopted stylus method for measuring shot peening surface roughness Ra and Ry, observed macroscopically shape character of shot peening surface by scanning electron microscope. The results indicated that shot peening pressure, nozzle scanning velocity, target distance caused uniform effect rules on shot peening surface roughness of 45 steel and 2Al1 aluminum alloy material, surface roughness Ra augments as the increase of shot peening pressure and minishs as the increase of scanning velocity, furthermore, there exists the biggest surface roughness target distance. When shot peening target distance was less than the biggest surface roughness target distance, surface roughness Ra and Ry tend to augment as the increase of target distance and inversely proportional to the material strength. When gives less original surface roughness and lower shot peening pressure, it’s not suitable for using Ry to represent shot peening surface roughness but Ra. When shot peened excessively, the surface of the material occurred body exfoliation and corrosion.

scholarly journals Study on the Influence of Surface Temperature Field of Aluminum Alloy Etched by Laser Water Jet Composite Machining

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3206
Author(s):  
Xuehui Chen ◽  
Xin Xu ◽  
Wei Liu ◽  
Lei Huang ◽  
Hao Li ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Temperature Field ◽  
Surface Temperature ◽  
Process Parameters ◽  
Water Jet ◽  
Laser Machining ◽  
Material Surface ◽  
Laser Etching ◽  
Surface Temperature Field

This paper studies the compound effect of liquid medium and laser on the workpiece and analyses the law of material surface temperature change during the processing. Taking 7075-T6 aluminum alloy as the research object, the surface temperature field of aluminum alloy processed using water-jet-assisted laser machining under different process parameters was simulated using finite element software. In addition, the temperature field of the material surface was detected in real-time using the self-built water-jet-assisted laser machining temperature field detection system, and the processing results were observed and verified using an optical microscope, scanning electron microscope, and energy spectrum analyzer. The results show that when the water jet inflow angle is 45°, the heat-affected area of the material surface is the smallest, and the cooling effect of the temperature field of the material surface is better. Considering the liquidus melting point of 7075 aluminum alloys, it is concluded that the processing effect is better when the water jet velocity is 14 m·s−1, the laser power is 100 W, and the laser scanning speed is 1.2 mm·s−1. At this time, the quality of the tank is relatively good, there are no cracks in the bottom of the tank, and there is less slag accumulation. Compared with anhydrous laser etching, water-jet-assisted laser etching can reduce the problems of micro-cracks, molten slag, and the formation of a recast layer in laser etching and improve the quality of the workpiece, and the composition of the bottom slag does not change. This study provides theoretical guidance and application support for the selection and optimization of process parameters for water-jet-assisted laser etching of aluminum alloy and further enriches the heat transfer mechanism of multi-field coupling in the process of water-jet-assisted laser machining.

The Prediction of Shot Peening’s Surface Roughness with Premixed Water Jet Based on Neural Network

2010 ◽  
Vol 136 ◽  
pp. 172-175
Author(s):  
Rui Hong Wang ◽  
Chong Wang ◽  
Xiao Mei Zhang
Keyword(s):  
Neural Network ◽  
Mathematical Model ◽  
Surface Roughness ◽  
Aluminum Alloy ◽  
Prediction Accuracy ◽  
Scanning Speed ◽  
Water Jet ◽  
Average Error ◽  
Affecting Factors ◽  
Roughness Prediction

Shot peening’s surface roughness is an important factor affecting the effect of shot-peening. The paper selects blasting pressure, scanning speed and target distance as affecting factors in the process parameters, the shot penning test which aims at 2A11 aluminum alloy materials through applying the premixed water jet, according to test data, the paper establishes mathematical model of shot peening’s surface roughness applying neural network, and applies this model to predict shot peening’s surface roughness. The results show that the training average error of this model is small, the predicted effect is good, it can meet the requirements of shot peening’s surface roughness prediction accuracy in the industrial production, it has greater practical value.

Influence of Laser Shot Peening Parameters on the Surface Hardness and Roughness of 7075 Aluminum Alloy

2018 ◽  
Vol 920 ◽  
pp. 83-88
Author(s):  
Jun Hao Zhang ◽  
Xiu Quan Cheng ◽  
Qin Xiang Xia ◽  
Jia Yu Li
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Shot Peening ◽  
Surface Hardness ◽  
Laser Shot ◽  
7075 Aluminum Alloy ◽  
Alloy Specimen ◽  
Structural Parts ◽  
The Impact ◽  
Overlap Rate

The laser shot peening has the widely application prospect in aircraft structural parts repairment. The influence of laser shot peening parameters on the surface hardness and surface roughness has guiding significance for laser shot peening process. The variation law of surface hardness and surface roughness in the peening area of 7075 aluminum alloy were obtained based on the experiment research. The results show that the surface hardness improves effectively after laser shot peening, and the maximum hardness is 205.4HV, which is improved by 19.49% compared with the original hardness. Besides, the surface roughness of the rough specimen decreases; whereas, those of the smooth specimen increases after laser shot peening. However, both the surface hardness and surface roughness tend to be saturated when the impact times exceeds 3 times or the overlap rate exceeds 50%. Therefore, a good repairment effect can be obtained with 3 impact times and 50% overlap rate for the 7075 aluminum alloy specimen.

Study on the Improvement of Fatigue Crack Growth Performance of 6061-T6 Aluminum Alloy Subject to Laser Shot Peening

2011 ◽  
Vol 464 ◽  
pp. 391-394 ◽  
Author(s):  
Cheng Dong Wang ◽  
Jian Zhong Zhou ◽  
Shu Huang ◽  
X.D. Yang ◽  
Z.C. Xu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Crack Growth ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Compact Tension ◽  
Crack Size ◽  
Laser Shot ◽  
Material Surface ◽  
Residual Stress Field

In order to enhance mechanical property and restrain crack growth of 6061-T6 aluminum alloy, laser shot peening (LSP) was employed to induce compressive residual stress and plastic deformation on the surface of metal. The FEA code ABAQUS and MSC. Fatigue were used to simulate crack growth of Compact tension (CT) specimens treated by LSP. The numerical simulation results showed that LSP can effectively inhibit the crack growth, decrease the crack growth rate as well as increase the final crack size, and as a consequence, fatigue life was extended. Adding peening times could get deeper compressive residual stress field which strengthen material surface and restrain crack growth, but the fatigue stress intensity factor threshold decreases.

scholarly journals Cavitation Peening: A Review

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 270 ◽  
Author(s):  
Hitoshi Soyama
Keyword(s):  
Surface Roughness ◽  
Surface Modification ◽  
Shot Peening ◽  
High Speed ◽  
Water Jet ◽  
Fatigue Properties ◽  
Bubble Collapse ◽  
Metallic Materials ◽  
Increase Surface Roughness ◽  
Local Plastic Deformation

The most popular surface modification technology used to enhance the mechanical properties of metallic materials is shot peening. Shot peening improves fatigue life and strength by introducing local plastic deformation pits. However, the pits increase surface roughness, which is a disadvantage for fatigue properties. Recently, cavitation peening, in which cavitation bubble collapse impacts are used, has been developed as an advanced surface modification technology. The advantage of cavitation peening is the lesser increase in surface roughness compared with shot peening, as no solid collisions occur in cavitation peening. In conventional cavitation peening, cavitation is generated by injecting a high-speed water jet into water. However, cavitation peening is different from water jet peening, in which water column impacts are used. In the present review, to avoid confusing cavitation peening and water jet peening, fundamentals and mechanisms of cavitation peening are described in comparison to water jet peening, and the effects and applications of cavitation peening are reviewed compared with the other peening methods.

scholarly journals Laser Assisted Micro Grinding of Titanium

2021 ◽  
Author(s):  
Ashish Kumar Sahu ◽  
Sunil Jha
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Laser Power ◽  
Tangential Force ◽  
Material Surface ◽  
Grinding Wheel ◽  
Micro Channel ◽  
Grinding Forces ◽  
Scanning Velocity ◽  
Pulsed Fiber Laser

Abstract Laser assisted micro-grinding (LAMG) is an emerging area of research in the field of high-quality micro-job fabrication and performance improvement. Conventional micro grinding (CMG) by micro pencil grinding tool suffers drawbacks such as tool deflection, higher cutting force and poor surface finish. In the present work, authors have attempted to investigate the performance of LAMG and CMG in the fabrication of micro-channel on Titanium material. Surface of workpiece was structured with the help of air assisted nanosecond-pulsed fiber laser scanning prior to the CMG at the different values of laser power by keeping scanning velocity constant. During the study, the CMG forces were recorded and after the processes surface roughness of the fabricated microchannels was measured. Results have shown reduction in the magnitude of the normal and tangential force by 31 % and 44 %, respectively, in LAMG compared to the CMG. In addition to that better surface finish was observed in LAMG than CMG. The surface roughness of micro-channel and grinding forces were found to be dependent on the power density of laser. Increase in the laser power deteriorates the surface finish and reduces the magnitude of grinding forces. High grinding forces in the CMG led to the dynamic deflection of the grinding wheel which produced the vibration in the process. The excessive vibration in CMG processes exploited the surface finish of the micro-channel. Such vibration was not observed on the LAMG process; as a result, better dimensional accuracy and surface finish of the channel was found.

scholarly journals Influence of Semi-Random and Regular Shot Peening on Selected Surface Layer Properties of Aluminum Alloy

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7620
Author(s):  
Jakub Matuszak ◽  
Kazimierz Zaleski ◽  
Agnieszka Skoczylas ◽  
Krzysztof Ciecieląg ◽  
Krzysztof Kęcik
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Aluminum Alloy ◽  
Shot Peening ◽  
Workpiece Surface ◽  
Microhardness Distribution ◽  
Ball Diameter ◽  
Surface Layer Hardening ◽  
Reduced Surface

This paper attempts to compare regular shot peening (RSP) and semi-random shot peening (SRSP). A characteristic of the first method is that the peening elements hit the treated surface in sequence, with a regular distance maintained between the dimples. The other method (SRSP) is a controlled modification of the shot-peening process, which is random by nature. The shot-peening method used in this study differs from conventional shot peening (shot blasting and vibratory shot peening) in that it allows controlled and repeatable determination of the configuration and distribution of impacts exerted by the peening element on the workpiece surface, which makes the process more repeatable and easier to model. Specimens of EN-AW 7075 aluminum alloy were used for testing. The following variables were used in the experiments: ball diameter, impact energy, and distance between the dimples. Microhardness distribution in the surface layer, 2D surface roughness, and surface topography were analyzed. FEM simulations of the residual stress distribution in the surface layer were performed. It has been found that regular shot peening results in reduced surface roughness, while semi-random shot peening leads to higher surface layer hardening.

Experimental Study on the Surface Roughness of 1060 Aluminum Alloy Cut by Abrasive Water Jet

2019 ◽  
Vol 950 ◽  
pp. 32-37 ◽  
Author(s):  
Qi Wen Xu ◽  
Chi Heng Qiang ◽  
Chu Wen Guo
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Surface Quality ◽  
Dominant Role ◽  
Traverse Speed ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Work Pressure ◽  
Cutting Surface

Through the experiment of cutting 1060 Aluminum Alloy by Abrasive Water Jet (AWJ), the surface roughness of material which is cut by AWJ is controlled by the cutting work pressure, cutting stand-off distance, cutting traverse speed and the abrasive diameter which used in AWJ. Measuring the cutting surface roughness of 1060 Aluminum Alloy by stereomicroscope and surfagauge, among the factor which can affect the surface roughness, the cutting traverse speed play a dominant role to control the surface roughness in the process of cutting. As the result of the surface roughness of 1060 Aluminum Alloy at different cutting depth is different, which can be separated in two different zones (Smooth area and Rough zone). As the result of experiment, the abrasive diameter has little effect to change the surface roughness between two different zones. The surface quality of rough zone can be improved when change the diameter of abrasive: with the diameter of abrasive increase, the surface quality of rough zone become better. A higher cutting pressure can improve the surface quality of the cutting surface of 1060 Aluminum Alloy. While increase the cutting traverse speed in the process of cutting can decrease the surface quality of 1060 Aluminum Alloy cutting surface. In a certain range, increase the cutting stand-off distance of AWJ can decrease the surface roughness of the cutting surface, and the roughness of cutting surface will change little when the stand-off distance increases to a certain extent.

Surface integrity and fatigue behavior in shot-peening for high-speed milled 7055 aluminum alloy

2016 ◽  
Vol 231 (2) ◽  
pp. 243-256 ◽  
Author(s):  
Changfeng Yao ◽  
Lufei Ma ◽  
Yongxia Du ◽  
Junxue Ren ◽  
Dinghua Zhang
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Compressive Stress ◽  
Surface Integrity ◽  
Shot Peening ◽  
High Speed ◽  
Fatigue Behavior ◽  
Source Zone ◽  
7055 Aluminum Alloy

The influence of shot-peening parameters on surface integrity of 7055 aluminum alloy is investigated based on shot-peening experiments. Surface integrity measurements, fatigue fracture analysis and fatigue life tests are conducted to reveal the effect of surface integrity on crack initiation and fatigue life. The results show that surface roughness increases significantly, and irregular pits and bumps appear on surface after shot-peening; grain on subsurface is refined and produces a shift and distortion in the pellets hit direction; compressive stress can be detected on all machined surfaces. Shot-peening parameters have significant impact on micro-hardness. In comparison with the milled specimen, fatigue life of peened specimens is improved by about 23.8, 3.96 and 1.01 times. Fatigue source zone transfers from stress concentration location on surface to subsurface due to the lower surface roughness and lager residual compressive stress.

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