The Effects of Shot-Peening on Surface Residual Stress of Advanced Ultrahigh-Strength Trip-Aided Steels

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.

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Effects of Double Shot Peening Treatment by HV1200-Class Fe-Cr-B Media on Surface Residual Stress and Fatigue Property of Case Hardened JIS SCM420

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet.74.682 ◽

2010 ◽

Vol 74 (10) ◽

pp. 682-687 ◽

Cited By ~ 2

Author(s):

Toshiyuki Sawada ◽

Akihiko Yanagitani

Keyword(s):

Residual Stress ◽

Shot Peening ◽

Fatigue Property ◽

Surface Residual Stress

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

Tetsu-to-Hagane ◽

10.2355/tetsutohagane1955.80.2_131 ◽

1994 ◽

Vol 80 (2) ◽

pp. 131-136 ◽

Cited By ~ 4

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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Fatigue Limit of Custom 465 with Surface Strengthening Treatment

Materials ◽

10.3390/ma13010238 ◽

2020 ◽

Vol 13 (1) ◽

pp. 238 ◽

Cited By ~ 1

Author(s):

Gang An ◽

Ren-jing Liu ◽

Guang-qiang Yin

Keyword(s):

Residual Stress ◽

Fatigue Crack ◽

Fatigue Limit ◽

Shot Peening ◽

Compressive Residual Stress ◽

Subsurface Layer ◽

Micro Hardness ◽

Surface Residual Stress ◽

Surface Strengthening ◽

The Relationship

In order to study the effect of nitriding or shot peening on the surface modification and fatigue properties of martensitic stainless-steel Custom 465, the residual stress and micro-hardness of the strengthened layer are determined by X-ray and micro-hardness tester, respectively. The up-and-down method is used to measure the rotational bending fatigue strength at 1 × 107 cycles, and the fatigue fracture characteristic is observed by scanning electron microscopy. The relationship between surface residual stress and internal fatigue limit of surface strengthening treatment is discussed. Results show that nitriding or shot peening surface strengthening layer forms a certain depth of compressive residual stress, where in the surface compressive residual stress of the nitrided specimens is greater than the shot peened specimens. The micro-hardness of the nitrided or shot peened surface strengthening layer is significantly improved, where in the surface micro-hardness of nitriding specimens are higher than shot peening specimens. The nitriding or shot peening surface strengthening can significantly improve the fatigue limit of Custom 465, wherein the fatigue limits of nitrided and shot peened surface strengthened specimens are 50.09% and 50.66% higher than that of the un-surface strengthened specimens, respectively. That is, the effect of the two strengthening methods on fatigue limit is not very different. The fracture characteristics show that the fatigue crack of the un-surface strengthened specimens originates from the surface, while the fatigue crack of surface strengthened specimens originates from the subsurface layer under the strengthened layer. The relationship between the internal fatigue limit and the surface residual stress of the surface strengthened specimen can be used as a method for predicting the fatigue limit of the surface strengthened specimens.

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Investigation of Shot Peening Effect on Titanium Alloy Affecting Surface Residual Stress and Roughness for Aerospace Applications

Procedia Structural Integrity ◽

10.1016/j.prostr.2019.05.018 ◽

2019 ◽

Vol 14 ◽

pp. 134-141 ◽

Cited By ~ 1

Author(s):

R.K. Kumar ◽

P. SampathKumaran ◽

S. Seetharamu ◽

S. Anand Kumar ◽

T. Pramod ◽

...

Keyword(s):

Residual Stress ◽

Titanium Alloy ◽

Shot Peening ◽

Surface Residual Stress ◽

Aerospace Applications

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BEHAVIOR OF SURFACE RESIDUAL STRESS INDUCED BY SHOT PEENING (II)

Advances in Surface Treatments ◽

10.1016/b978-0-08-034923-7.50021-8 ◽

1987 ◽

pp. 139-144

Author(s):

K. Iida ◽

K. Tosha

Keyword(s):

Residual Stress ◽

Shot Peening ◽

Surface Residual Stress

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Residual Stresses Associated with the Production of Coiled Automotive Springs

Materials Science Forum ◽

10.4028/www.scientific.net/msf.777.78 ◽

2014 ◽

Vol 777 ◽

pp. 78-83 ◽

Cited By ~ 1

Author(s):

Andrew M. Venter ◽

Vladimir Luzin ◽

D.G. Hattingh

Keyword(s):

Residual Stress ◽

Shot Peening ◽

Stress Concentrations ◽

Forming Process ◽

Surface Residual Stress ◽

Process Stage ◽

Residual Stress State ◽

Production Stages ◽

Axial Residual Stress ◽

A New Technique

Cold coiling of high tensile steel rod into helical coil springs for the automotive industry is a new technique being implemented amongst spring manufacturers worldwide. To characterise this coil production process, the neutron strain scanning technique has been employed to non-destructively elucidate the influence production stages have on the tri-axial residual stress state. Samples investigated represented key production steps in the cold-coil forming process: Cold coiling; Tempering; Hot setting; Hot peening; Shot peening. Investigations revealed that the stress field was axi-symmetrical, that the dominant variation in all samples occurred along the hoop direction (helical circumference), whilst the radial and axial stresses are substantially lower. Accurate two-dimensional stress maps of the rod cross section have been compiled revealing key features associated with the cold coiling step. Comparison of the stress fields after each production step revealed altered stress values. The final shot peening process stage not only reduced stress concentrations at the internal bore, but contributed to the establishment of favourable surface residual stress conditions that enhance the fatigue life of the final product.

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

Hydrogen ◽

10.3390/hydrogen2030020 ◽

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.

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