Investigation of the Process Capability of Water Cavitation Peening and Shot Peening Processing

2011 ◽  
Vol 69 ◽  
pp. 83-87
Author(s):  
Bing Han ◽  
Chao Deng ◽  
Dong Ying Ju
Keyword(s):  
Shot Peening ◽  
Process Capability ◽  
Potential Method ◽  
Spring Steel ◽  
Bubble Collapse ◽  
X Ray Diffraction ◽  
Near Surface ◽  
Treatment Changes ◽  
Surface Morphologies ◽  
The Impact

Water cavitation peening (WCP) with aeration is a recent potential method in the surface enhancement techniques. In this method, a ventilation nozzle is adopted to improve the process capability of WCP by increasing the impact pressure, which is induced by the bubble collapse on the surface of components in the similar way as conventional shot peening(SP). In this paper, the process capability of water cavitation peening and shot peening is investigated, The residual stresses in the near-surface and surface morphologies of spring steel SAE 1070 was characterized by X-ray diffraction (XRD), optical microscopy (OM). After peening treatment, changes in surface morphologies, as well as residual stress with the different peening duration were recorded. The obtained results indicate that the WCP processing had a better surface finish than SP processing.

A Method for Evaluating Intensity of Water Cavitation Peening Processing

2011 ◽  
Vol 675-677 ◽  
pp. 747-750
Author(s):  
B. Han ◽  
Dong Ying Ju ◽  
Xiao Guang Yu
Keyword(s):  
Residual Stress ◽  
Process Capability ◽  
Diffraction Method ◽  
Spring Steel ◽  
Bubble Collapse ◽  
Plastic Layer ◽  
Process Conditions ◽  
X Ray Diffraction ◽  
Near Surface ◽  
The Impact

Water cavitation peening (WCP) with aeration, namely, a new ventilation nozzle with aeration is adopted to improve the process capability of WCP by increasing the impact pressure induced by the bubble collapse on the surface of components. In this study, in order to investigate the process capability of the WCP with aeration a standard N-type almen strips of spring steel SAE 1070 was treated byWCP with various process conditions, and the arc height value and the residual stress in the superficial layers were measured by means of the Almen-scale and X-ray diffraction method, respectively. The optimal fluxes of aeration and the optimal standoff distances were achieved. The maximum of arc height value reach around 150μm. The depth of plastic layer observed from the results of residual stresses is up to 150μm. The results verify the existence of macro-plastic strain in WCP processing. The distributions of residual stress in near-surface under different peening intensity can provide a reference for engineers to decide the optimal process conditions of WCP processing.

Experimental Investigation on Intensity and Residual Stress in Superficial Layers Induced by Water Cavitation Peening with Aeration

2008 ◽  
Vol 373-374 ◽  
pp. 754-757 ◽  
Author(s):  
Dong Ying Ju ◽  
B. Han
Keyword(s):  
Residual Stress ◽  
Process Capability ◽  
Diffraction Method ◽  
Spring Steel ◽  
Bubble Collapse ◽  
Process Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Enhancement Method ◽  
The Impact

Water cavitation peening (WCP) with aeration is a novel surface enhancement method. A new ventilation nozzle with aeration is adopted to improve the process capability of WCP by increasing the impact pressure induced by the bubble collapse on the surface of components. In this study, in order to investigate the process capability of the WCP with aeration, a standard N-type almen strips of spring steel SAE 1070 was treated by WCP with various process conditions, and the arc height value and the residual stress in the superficial layers were measured by X-ray diffraction method. The optimal fluxes of aeration and the optimal standoff distances were achieved.

Investigation of Water Cavitation Peening-Induced Microstructures and Residual Stress in the Near-Surface Spring Steel SAE 1070

2011 ◽  
Vol 299-300 ◽  
pp. 1036-1039
Author(s):  
Bing Han ◽  
H. Zhang ◽  
Dong Ying Ju
Keyword(s):  
Residual Stress ◽  
Spring Steel ◽  
Bubble Collapse ◽  
In Situ Observation ◽  
Near Surface ◽  
Influence Of Water ◽  
Observation Function ◽  
Stress Layer ◽  
Surface Morphologies ◽  
The Impact

Water cavitation peening (WCP) with aeration, namely, a new ventilation nozzle with aeration is adopted to improve the process capability of WCP by increasing the impact pressure induced by the bubble collapse on the surface of components. In this study, the influence of water cavitation peening (WCP) treatment on the microstructure of spring steel SAE 1070 was investigated. The microstructural evolution in the near-surface of spring steel SAE 1070 as a function of WCP time was characterized by X-ray diffraction (XRD), optical microscopy (OM). After WCP treatment, changes in the microstructure, as well as residual stress and surface morphologies as functions of WCP time, were recorded using a novel experimental design involving an in-situ observation function. The obtained results indicated that the refinement grains were induced by WCP in the strengthening layer. A stable compressive residual stress layer was found in the near-surface of the investigated spring steel SAE 1070.

Approach by Simulation of Residual Stress Generated by Shot-Peening and Their Stability during Fatigue Cycling

2011 ◽  
Vol 681 ◽  
pp. 303-308
Author(s):  
H. Michaud ◽  
Jean Michel Sprauel ◽  
Chedly Braham
Keyword(s):  
Residual Stress ◽  
Process Parameters ◽  
Shot Peening ◽  
Low Cycle Fatigue ◽  
Fatigue Behaviour ◽  
X Ray Diffraction ◽  
Alloy Steels ◽  
Spring Leaf ◽  
Usual Process ◽  
The Impact

ASCOMETAL produces alloy steels used for spring (leaf or coil), where the weak fatigue points are on the surface which is reinforced by shot-peening. So, the fatigue optimization with the steel grade needs a perfect knowledge of the material answer after shot-peening. For that reason, an analytical model has been developed where low cycle fatigue behaviour and all the usual process parameters are integrated (especially the impact position, and the covering-rate). Moreover, through a Monte-Carlos approach, the model permits to analyse the effect of scattering elements like impact speeds, ball sizes, or material fatigue behaviour. With this model several key process parameters have been analysed and validated with residual stress profiles evaluated by X-ray diffraction. So, for spring leaf, the effect of an applied load during shot-peening or shakedown during bending fatigue is described.

scholarly journals Application of the 3D Digital Image Correlation to the Analysis of Deformation of Joints Welded With the FSW Method After Shot Peening

2019 ◽  
Vol 19 (4) ◽  
pp. 57-66
Author(s):  
A. Kubit ◽  
M. Bucior ◽  
R. Kluz ◽  
Ł. Święch ◽  
K. Ochał
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Shot Peening ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Image Correlation ◽  
X Ray Diffraction ◽  
Butt Joints ◽  
3D Digital Image Correlation ◽  
The Impact

AbstractThe three dimensional Digital Image Correlation (3D DIC) method is used for measurements of deformations and displacement in plane elements exposed to loading. The paper presents the experimental tests of an application of the ARAMIS system to the analysis of deformation of joints welded with the FSW method after shot peening treatment. The butt joints were made of 2024-T3 aluminum alloy sheets with the thickness of 1 mm, which next were peened with glass beads about granulation in range 500 ÷ 900 µm. Tests of residual stresses by X-ray diffraction were also carried out. The aim of the study was to analyze the impact of shot peening on the value of stresses and the location of deformations in butt joints.

scholarly journals Design and Fatigue Analysis of Shot Peened Leaf Spring

2019 ◽  
Vol 9 (1) ◽  
pp. 1120-1126
Keyword(s):  
Fatigue Life ◽  
Shot Peening ◽  
High Strength ◽  
Load Level ◽  
Spring Steel ◽  
Leaf Spring ◽  
Leaf Springs ◽  
Point Test ◽  
Life Improvement ◽  
The Impact

The paper handles the fatigue and failing analysis of serial shot-peened leaf springs of cumbersome vehicles emphasizing on the impact of shot peening on fatigue life, coping with automotive leaf springs, the shot peening method turns into an important step in production.In the situation of leaf spring suspensions, however, asystematic research of the effect of shot peening about fatigue life isstill required. Experimental stress-life curves are determined with the aid of the usage of investigating clean specimen subjected to shot peening. those test consequences are as compared to corresponding ones identified from cyclic three-point test on shot peened serial leaf springs in order to show the influence of applied heat treatment and shot peening approach on fatigue existence of high-strength used to get leaf spring manufacturing, reliant on the load level. Analyses are performed to explain the effects resulting from shot peening practice on the surface features of the high-strength spring steel under examination. The evaluation of fatigue results shows that almost no life improvement due to production highlighting the importance for mutual variation in parameters of shot peening and thermal treatment so that there is sufficient progress in life

An Investigation into Work Hardening of Shot Peening Affected Layer Using X-Ray Stress Analysis Technique

2005 ◽  
Vol 490-491 ◽  
pp. 390-395
Author(s):  
J.B. Li ◽  
X.Y. Gai ◽  
D.L. Wang ◽  
S.Y. Ma ◽  
Vincent Ji
Keyword(s):  
Surface Layer ◽  
Yield Strength ◽  
Shot Peening ◽  
Work Hardening ◽  
Spring Steel ◽  
Metallic Surface ◽  
X Ray Diffraction ◽  
X Ray ◽  
Analysis Technique ◽  
Hard State

The work hardening effect of the shot peening affected layer of hardened and low temperature tempered spring steel was investigated using the method for determining the yield strength of a metallic surface with biaxial residual stress. The results show that for the surface layer of the specimens, the microhardness and half-width values of X-ray diffraction lines is decreased, whereas the yield strength is increased during shot peening. Thus, shot peening leads the surface layer of steel in hard state to work hardening instead of work softening.

scholarly journals A Numerical Investigation of a Single-Shot in a DEM-FEM Approach to Shot Peening Simulation

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1183
Author(s):  
Aghogho Bright Edward ◽  
P. Stephan Heyns ◽  
Schalk Kok
Keyword(s):  
Shot Peening ◽  
Strain Energy ◽  
Equivalent Plastic Strain ◽  
Contact Forces ◽  
Metallic Surface ◽  
Single Shot ◽  
Near Surface ◽  
Controllable Process ◽  
Localized Plastic Deformation ◽  
The Impact

Shot peening (SP) is a controlled and systematic process of surface treatment that has a large number of controllable process parameters that make its application highly challenging. It involves the shooting of small and hard metallic balls at a targeted surface, with the aim of enhancing the fatigue strength of the workpiece under unfavorable service conditions. The compressive residual stress (CRS) induced by this application is expensive to evaluate experimentally. This paper presents a numerical model of the impact of a single-shot on a metallic surface, with the aim to set the stage for a realistic multiple shots peening simulation. The approach proposed herein is a sequential Discrete Element-Finite Element (DE-FE) coupled simulation, based on the use of different types of coefficients of restitution (CoRs) with emphasis on the energetic CoR. The energetic CoR relates the shot/target contact forces to the fractional strain energy needed for localized plastic deformation of the near-surface layer in the workpiece. The generated results of the induced compressive residual stresses (CRS) and equivalent plastic strain (PEEQ) from single-shot simulations are validated with similar results from the literature. Our study clarifies the strain energy aspects of a single-shot impact responsible for the desired effects of CRS and PEEQ, thereby laying the groundwork for accurate and realistic modeling of the SP process via the DEM-FEM approach.

Modification of Alumina Ceramics Properties by Stressonic® Shot Peening

2005 ◽  
Vol 490-491 ◽  
pp. 509-514 ◽  
Author(s):  
Henryk Tomaszewski ◽  
K. Godwod ◽  
Ryszard Diduszko ◽  
F. Carrois ◽  
J.M. Duchazeaubeneix
Keyword(s):  
Shot Peening ◽  
Treatment Time ◽  
Surface Region ◽  
Microplastic Deformation ◽  
Material Surface ◽  
Alumina Ceramics ◽  
X Ray Diffraction ◽  
Near Surface ◽  
Compressive Stresses ◽  
Ultrasonic Shot Peening

Modification of material surface layers by conventional shot peening is commonly used to improve the strength of metal components. As it occurred high compressive stresses up to 2.0 GPa may be introduced also to near surface region of alumina ceramics by this technique. Two alumina ceramics were given to ultrasonic shot peening which is a new, compact and small consuming of shot media method developed by Sonats company. This process is named Stressonic®. The dependence between diameter of tungsten balls, treatment time (at constant mass of balls in the housing and vibration amplitude) and level of compressive stresses introduced was determined. High microplastic deformation in shot peened surface layer of alumina was observed by X-ray diffraction. An increase of surface resistance to fracture of ceramics with increasing level of compressive stresses was also found.

Influence of Ethanol as a Carburizing Agent on Carbon Surface Concentration and Microstructure of DIN 17NiCrMo7 Steel Gears

2015 ◽  
Author(s):  
Rogério Catalão ◽  
Omar Khayyam Ribas ◽  
José Rubens G. Carneiro ◽  
Érico Freitas ◽  
Larissa Vilela Costa ◽  
...  
Keyword(s):  
Shot Peening ◽  
Surface Concentration ◽  
Carbon Surface ◽  
Quantitative Chemical Analysis ◽  
X Ray Diffraction ◽  
Austenite Grain Size ◽  
X Ray ◽  
Transmission Electron ◽  
Before And After ◽  
The Impact

In the present work, the addition of ethanol to endothermic gas during the carburizing process of DIN 17NiCrMo7 steel gears was investigated with the objective of determining the impact on carbon surface concentration and microstructure. The materials were carburized at 870°C and 930°C, oil quenched, tempered and subsequently shot peened. Carburizing was carried out in a continuous industrial furnace for a total of 280 min. After quenching and tempering, the in-depth carbon concentrations were determined through quantitative chemical analysis and the resulting profiles were modeled in order to obtain carbon diffusivity constants. The amount of retained austenite and austenite grain size, determined by X-ray diffraction and optical microscopy, were found to increase with carburizing temperature. Residual stress profiles were also determined by X-ray diffraction before and after the shot-peening process. The microstructure of the specimens was further investigated by transmission electron microscopy, which revealed the presence of BCC martensite before and after shot-peening. The enrichment of the endothermic gas carrier with ethanol could be shown to be a viable option, allowing for surface concentrations of up to 0.8%C.

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