scholarly journals Role of Ultrasonic Shot Peening in Environmental Hydrogen Embrittlement Behavior of 7075-T6 Alloy

Hydrogen ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 377-385
Author(s):  
Mahdieh Safyari ◽  
Masoud Moshtaghi
Keyword(s):  
Residual Stress ◽  
Hydrogen Embrittlement ◽  
Fracture Mode ◽  
Shot Peening ◽  
Unit Length ◽  
Surface Residual Stress ◽  
Nitrogen Gas ◽  
Ultrasonic Shot Peening ◽  
Slow Strain Rate Technique

The effect of ultrasonic shot peening on the environmental hydrogen embrittlement behavior of the 7075-T6 aluminum alloy is investigated. The 7075-T6 tensile specimens were treated by ultrasonic shot peening for 50 s. Surface residual stress and the depth of residual stress under the surface were evaluated using an X-ray diffractometer. Then, the specimens were tensile tested in humid air and dry nitrogen gas by the slow strain rate technique. The results showed that the ultrasonic shot-peened specimen has a superior hydrogen embrittlement resistance. Further, the ultrasonic shot peening changes the fracture mode from an intergranular fracture mode to the transgranular one. It was suggested that ultrasonic shot-peening has two effects on hydrogen embrittlement behavior; the distribution of hydrogen inside the surface layer by introducing dislocations/vacancies as hydrogen traps and reducing the normalized amount of hydrogen trapped per unit length of the grain boundary.

3D Model of Shot Dynamics for Ultrasonic Shot Peening

2013 ◽  
Vol 768-769 ◽  
pp. 503-509 ◽  
Author(s):  
Jawad Badreddine ◽  
Emmanuelle Rouhaud ◽  
Matthieu Micoulaut ◽  
Sebastien Remy ◽  
Vincent Desfontaine ◽  
...  
Keyword(s):  
Residual Stress ◽  
Process Parameters ◽  
Spatial Data ◽  
Shot Peening ◽  
3D Model ◽  
Prediction Models ◽  
Dissipated Energy ◽  
Displacement Fields ◽  
Ultrasonic Shot Peening ◽  
Stress Prediction

This paper presents a 3D model that simulates an ultrasonic shot peening (USP) operation, using realistic process parameters and peening setups (part and chamber geometries). By simulating the shot dynamics (shot trajectories and impacts), statistical and spatial data are obtained for the peened component, i.e. surface coverage and coverage rate, impact speeds and angles, dissipated energy... This data can then be used for i) optimizing the design of peening chambers and process parameters and ii) predicting the residual stress and displacement fields induced by USP in the peened component. In fact, data from the 3D model can be used as initial data in existing residual stress prediction models. A chaining methodology was developed for this purpose and allows linking the choice of process parameters and USP setup to the induced residual stress displacement fields.

Role of ultrasonic shot peening on microstructure, hardness and corrosion resistance of nitrogen stabilised stainless steel without nickel

2019 ◽  
Vol 6 (9) ◽  
pp. 096578
Author(s):  
Chandra Shekhar Kumar ◽  
Girija Shankar Mahobia ◽  
Arijit Podder ◽  
Sanjeev Kumar ◽  
Rahul Kumar Agrawal ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Shot Peening ◽  
Ultrasonic Shot Peening

Numerical Simulation of Residual Stress Field Induced by Ultrasonic Shot Peening

2008 ◽  
Vol 373-374 ◽  
pp. 832-835 ◽  
Author(s):  
Gang Ma ◽  
Xiang Ling ◽  
Yuan Song Zeng
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Diffraction Method ◽  
Residual Tensile Stress ◽  
Finite Element Software ◽  
Ultrasonic Shot Peening ◽  
Stress Layer

A 3D finite element model is established to simulate the ultrasonic shot peening process by using a finite element software ABAQUS. The residual stress distribution of the AISI 304 stainless steel induced by ultrasonic shot peening (USP) is predicted by finite element analysis. Ultrasonic shot peening (USP) process can cause a compressive residual stress layer on the surface of the material. During the simulation, many factors, e.g., ultrasonic shot peening duration, initial residual stress, hourglass, etc., are taken into consideration for the purpose of optimizing the process. The simulation results show that ultrasonic shot peening can produce a compressive residual stress layer on the surface of the material even if there is initial residual tensile stress (250MPa) and the longer peening duration. The residual stress of simulation were compared with the experiment data which were obtained under the same ultrasonic shot peening parameters and have a good agreement with the measurement values by X-ray diffraction method. In conclusion, ultrasonic shot peening is an effective method for protecting weldments against stress corrosion cracking by introducing the compressive residual stress layer into the surface of stainless steel.

Influence of Shot-Peening Parameters on the Sub-Surface Residual Stress Profiles in Al-7075 Alloy Components

2013 ◽  
Vol 768-769 ◽  
pp. 66-71 ◽  
Author(s):  
Diego Cecchin ◽  
Cristy Leonor Azanza Ricardo ◽  
Mirco D'Incau ◽  
Michele Bandini ◽  
Paolo Scardi
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
Shot Peening ◽  
Stress Gradient ◽  
Stress Profile ◽  
Surface Residual Stress ◽  
X Ray ◽  
Al 7075 ◽  
Stress Profiles ◽  
Residual Stress Analysis

Aluminum alloy (Al-7075-T6) samples were analyzed to determine the in-depth residual stress profile induced by a shot-peening treatment. The influence of coverage degree and Almen intensity on the surface residual stress and on the sub-surface residual stress gradient was investigated. Residual stress profiles were obtained using three different techniques: (i) standard laboratory X-ray diffraction (XRD) residual stress analysis with progressive chemical layer-removal; (ii) XRD residual stress analysis with synchrotron radiation using different X-ray energies, thus changing the penetration depths, and (iii) Blind Hole Drilling (BHD). A comprehensive comparison of the results given by the used techniques is shown.

Development of Ultrasonic Shot Peening Technique for Reactor Components to Improve Structural Integrity Against Stress Corrosion Cracking

2009 ◽  
Author(s):  
Shohei Kawano ◽  
Ayaka Kawagishi ◽  
Nobuichi Suezono ◽  
Kenichi Ueno ◽  
Ken Okuda ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Shot Peening ◽  
Structural Integrity ◽  
Weld Line ◽  
Corrosion Cracking ◽  
Experimental Result ◽  
Ultrasonic Shot Peening

The ultrasonic shot peening (USP) technique has been developed for boiling water reactor (BWR) components as a countermeasure against stress corrosion cracking. The effects on residual stress of USP for type 316L stainless steel and alloy 600 were evaluated. Compressive residual stress layer of 0.5 mm from the surface were formed on the specimens after USP using stainless steel ball with a diameter of 3 mm. Cross-sectional hardness measurement revealed that the increase of hardness due to USP is not significant compared with shot peening (SP). The FEM calculation showed the plastic strain induced by the impacts of 3 φ shot with 5 m/s is lower than those of 0.6 φ shot with 50 m/s. It suggests USP process suppresses the degree of work hardening in comparison with SP process. Dissimilar weld joint specimens which simulate the material and dimension of the shroud weld line H7 were examined to confirm the applicability of USP. The experimental result reveals that USP technique is applicable to reactor internal components as stress modification process.

scholarly journals Effects of Hard Shot Peening with Water Jet on Surface Residual Stress Distribution of Carburized Steels

1994 ◽  
Vol 80 (2) ◽  
pp. 131-136 ◽  
Author(s):  
Takayoshi ISHIGURO ◽  
Toshiharu SHIMAZAKI ◽  
Kiyoshi TERAYAMA ◽  
Akio YONEGUCHI
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Shot Peening ◽  
Water Jet ◽  
Residual Stress Distribution ◽  
Surface Residual Stress
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