Effect of laser shock peening without coating on fretting corrosion of copper contacts
- Authors
- Park, Changkyoo; Jung, Donghyuck; Chun, Eun-Joon; Ahn, Sanghoon; Jang, Ho; Kim, Yoon-Jun
- Issue Date
- 1-6월-2020
- Publisher
- ELSEVIER
- Keywords
- Laser shock peening without coating; Copper; Grain refinement; Compressive residual stress; Fretting corrosion
- Citation
- APPLIED SURFACE SCIENCE, v.514
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 514
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/55082
- DOI
- 10.1016/j.apsusc.2020.145917
- ISSN
- 0169-4332
- Abstract
- The effects of laser shock peening without coating (LSPwC) on the degradation of copper electrical contact was investigated. A Nd:YAG laser with laser energy densities of 5.3 and 10.6 GW/cm(2) was used for the LSPwC process. Surface hardness was enhanced from 55 HV to 110 and 120 HV for the laser shock-peened copper at 5.3 GW/cm(2) and 10.6 GW/cm(2), respectively. Moreover, near the copper surface, LSPwC introduced the max. compressive residual stress of 387.5 and 385.5 MPa for laser energy densities of 5.3 and 10.6 GW/cm(2), respectively. Electron backscatter diffraction and transmission electron microscopy revealed that LSPwC introduced dislocation rearrangement, deformation twins, and grain refinement. The laser shock-peened copper exhibited superior wear resistance compared with the base metal. During the fretting test, the wear loss of the base metal was 1.61 x 10(-3) mm(3), and this decreased to 0.99 x 10(-3) and 0.94 x 10(-3) mm(3) for the laser shock-peened copper at 5.3 and 10.6 GW/cm(2), respectively. Thus, the laser shock-peened copper maintained a low electrical contact resistance during the fretting test, resulting in electrical contact failure delay from 2790 cycles for the base metal to 5011 and 5210 cycles for laser shock-peened copper at 5.3 and 10.6 GW/cm(2), respectively.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.