Review of shot peening processes to obtain nanocrystalline surfaces in metal alloys

Cold treatment techniques are used to enhance the mechanical properties of metal alloys, whose most important characteristics are strength, roughness, and microstructure. The aim of this research is to test the effect of Conventional Shot Peening (CSP) and Severe Shot Peening (SSP) on the mechanical properties of ST37-2 steel. The results of the experiments showed enhancements in surface roughness and tensile strength. However, shot peening decreased the ductility of the metal and caused changes in its microstructure that are indicated in the XRF and XRD tests. Results’ data are provided as an original contribution to the literature while they are compared with the existing data.

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The Numerical Simulations for the Shot Peening Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.773-774.3 ◽

2013 ◽

Vol 773-774 ◽

pp. 3-8

Author(s):

Chun Ho Liu ◽

A. Cheng Wang ◽

Kuo Zoo Liang

Keyword(s):

Shot Peening ◽

Metal Forming ◽

Deformation Theory ◽

Numerical Technique ◽

Metal Alloys ◽

Forming Process ◽

Dynamic Finite Element ◽

Precise Analysis ◽

Impact Problems ◽

Finite Deformation Theory

To develop a generalized numerical model by the elasto-plastic formulation coupling with dynamic finite element method for the shot peening process of metal alloys is the main goal of this paper. The analysis code is based on the finite deformation theory; the optimum numerical technique and the relevant parameters of forming process. In this study, the simulations of single and multi shot forming process were performed. The effects of impact velocity and strain rate, size of workpiece, and the residual stress were observed and discussed in details. After comparing with the corresponding papers, the universal model for metal shot peening analyses will be developed completely. The most significant advantage of this paper is the development of the precise analysis technology to suit for the future necessity of the manufacturing processes. The suggested models and techniques are helpful in solving of impact problems or metal forming processes.

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TEM evaluation of steel nanocrystalline surfaces obtained by severe shot peening

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2021.127238 ◽

2021 ◽

Vol 418 ◽

pp. 127238

Author(s):

L.B. Peral ◽

Amado Quintero ◽

A.T. Vielma ◽

María Florentina Barbés ◽

I. Fernández-Pariente

Keyword(s):

Shot Peening ◽

Nanocrystalline Surfaces ◽

Severe Shot Peening

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Specimen Preparation of Near Surface Ion Irradiated Samples

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100117820 ◽

1985 ◽

Vol 43 ◽

pp. 170-171

Author(s):

K. F. Russell ◽

L. L. Horton

Keyword(s):

Radiation Damage ◽

Heavy Ions ◽

Target Material ◽

Metal Alloys ◽

Specimen Surface ◽

Specimen Preparation ◽

Particle Accelerators ◽

Near Surface ◽

Graaff Accelerator ◽

Van De Graaff

Beams of heavy ions from particle accelerators are used to produce radiation damage in metal alloys. The damaged layer extends several microns below the surface of the specimen with the maximum damage and depth dependent upon the energy of the ions, type of ions, and target material. Using 4 MeV heavy ions from a Van de Graaff accelerator causes peak damage approximately 1 μm below the specimen surface. To study this area, it is necessary to remove a thickness of approximately 1 μm of damaged metal from the surface (referred to as “sectioning“) and to electropolish this region to electron transparency from the unirradiated surface (referred to as “backthinning“). We have developed electropolishing techniques to obtain electron transparent regions at any depth below the surface of a standard TEM disk. These techniques may be applied wherever TEM information is needed at a specific subsurface position.

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