Surface layer hardening of polycrystalline copper by multiple impact

1980 ◽  
Vol 15 (9) ◽  
pp. 2331-2334 ◽  
Author(s):  
E. B. Iturbe ◽  
I. G. Greenfield ◽  
T. W. Chou
Keyword(s):  
Surface Layer ◽  
Polycrystalline Copper ◽  
Surface Layer Hardening ◽  
Multiple Impact

Study of Surface Layer Hardening after Treatment Complex Tool

2020 ◽  
Vol 303 ◽  
pp. 89-96
Author(s):  
K.S. Mitrofanova
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Strain State ◽  
Experimental Studies ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Technological Inheritance ◽  
Multiple Loading ◽  
Surface Layer Hardening ◽  
Solidified Body

The results of experimental studies of the thin surface layer of samples made of steel 45 after treatment with surface plastic deformation (SPD) multiradius roller (MR-roller) are presented. On the basis of the apparatus of the mechanics of technological inheritance, taking into account the effect of the solidified body, a model of the process according to the scheme of multiple loading-unloading of metal, taking into account the phenomenology of the SPD process and the properties of the material, is created. Distributions of parameters of the stress-strain state in the deformation centre are obtained, the parameters of roughness and microhardness of the surface layer are investigated.

scholarly journals Topographic Arrangement of Crystallite Orientations in Rolled Copper

Texture ◽  
1972 ◽  
Vol 1 (2) ◽  
pp. 99-109 ◽  
Author(s):  
R. Gotthardt ◽  
G. Hoschek ◽  
O. Reimold ◽  
F. Haessner
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Single Crystals ◽  
Cross Sections ◽  
Rolling Plane ◽  
Correlated Data ◽  
Formation Mechanisms ◽  
Polycrystalline Copper ◽  
Polycrystalline Structure ◽  
X Ray

In single and polycrystalline copper rolled to a reduction of 95 %, the topographic arrangements of crystallite orientations were determined over large areas by means of electron microscopy. Correlated data on orientation, diffraction site, and transmission pictures in three cross-sections perpendicular to the normal, rolling and transverse directions were obtained and evaluated. These results were complemented by X-ray studies of the texture. The rolled polycrystalline structure consists of roughly disc-shaped regions of uniform orientation which are fairly strongly misoriented with respect to each other. The planes of the discs lie paral.lel to the rolling plane. Within these regions of uniform orientation lie elongated subgrains extended in the longitudinal and transverse directions. In a surface layer of a few microns thickness the dryly rolled single crystals have essentially a (100)[011] texture. This is independent of the orientation of the interior of the material. The observed structures are discussed with respect to possible formation mechanisms.

Treatment with a High-Temperature Pulsed Plasma and Laser Radiation for Die Steel Surface Layer Hardening

Metallurgist ◽  
2016 ◽  
Vol 60 (7-8) ◽  
pp. 739-744
Author(s):  
A. V. Aborkin ◽  
V. E. Vaganov ◽  
N. S. Klimov ◽  
D. V. Kovalenko ◽  
A. V. Sobol’kov
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Laser Radiation ◽  
Steel Surface ◽  
Pulsed Plasma ◽  
Die Steel ◽  
Surface Layer Hardening

Development of Parameters Describing Heterogeneous Hardened Structure

2015 ◽  
Vol 756 ◽  
pp. 75-78 ◽  
Author(s):  
A. Kirichek ◽  
S.V. Barinov
Keyword(s):  
Surface Layer ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Heterogeneous Structure ◽  
Treatment Technique ◽  
Pulse Treatment ◽  
Precise Adjustment ◽  
Surface Layer Hardening ◽  
Definition Of ◽  
Hardened Surface

The technique was developed with the purpose of definition of parameters for surface layer uniformity after mechanical hardening. It was found that one of the most effective methods of surface plastic deformation that provide precise adjustment of uniformity level of surface layer hardening is presented by static-pulse treatment technique. This method helps to develop hardened surface layer 8 mm deep with virtually uniform or heterogeneous structure.

scholarly journals Surface layer hardening of metastable austenitic steel – Comparison of shot peening and cryogenic turning

2020 ◽  
Vol 9 (6) ◽  
pp. 16410-16422
Author(s):  
Hendrik Hotz ◽  
Benjamin Kirsch ◽  
Tong Zhu ◽  
Marek Smaga ◽  
Tilmann Beck ◽  
...  
Keyword(s):  
Surface Layer ◽  
Austenitic Steel ◽  
Shot Peening ◽  
Metastable Austenitic Steel ◽  
Surface Layer Hardening ◽  
Cryogenic Turning

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.

Mechanism of Healing Fatigue Damage by Pulsed Laser Surface Irradiation for Polycrystalline Copper Film

2012 ◽  
Vol 538-541 ◽  
pp. 1866-1869
Author(s):  
Chong Gang Ren ◽  
De Guang Shang ◽  
Chang Gang Nai ◽  
Lu Wang ◽  
Tao Chen
Keyword(s):  
Surface Layer ◽  
Grain Refinement ◽  
Fatigue Damage ◽  
Pulsed Laser ◽  
Copper Film ◽  
Fatigue Property ◽  
Surface Melting ◽  
Laser Surface ◽  
Polycrystalline Copper ◽  
Life Improvement

The mechanism of healing fatigue damage was investigated by pulsed laser surface irradiation for polycrystalline copper film, X-ray Diffraction(XRD), optical microscopic and scanning electron microscopy(SEM). The results indicate that surface melting and grain refinement were found in the melted surface layer. Tensile residual stresses were introduced in the resolidified surface layer due to laser surface melting which produced deleterious effect on fatigue property. Remelting and grain refinement in the surface layer is mainly responsible for healing fatigue damage and fatigue life improvement. The fatigue damage could be healed completely or partly by laser surface irradiation under the proper parameters of laser treatment for the specimens.

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