Effects of shot peening pressure, media type and double shot peening on the microstructure, mechanical and tribological properties of low-alloy steel

Pham Quang Trung, Nay Win Khun, David Lee Butler

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effects of different shot peening conditions such as pressure (from 68.9-551.6 kPa), media type (media S230 and S110) and double shot peening on the microstructure, mechanical and tribological properties of shot peened AISI 4340 low-alloy steels, were systematically investigated. Their surface topography, hardness and roughness were analyzed by scanning electron microscopy, a Vickers micro-hardness tester and surface profilometer, respectively, while the cross-sectional sub-surface structures of the as-received and shot peened samples were characterized by means of optical microscopy and nanoindentation. The tribological properties were determined by using a ball-on-disc microtribological tester. It was shown that shot peening pressure and media type had a significant effect on the surface roughness, hardness, microstructure, wear resistance and friction of the shot peened AISI 4340 steel samples. It also indicated that the double shot peening process was a promising treatment, not only to reduce the surface roughness of the material after undergoing the first shot peening process with large media and high intensity, but to improve the tribological properties of the shot peened material.

Original languageEnglish
Article number045001
Number of pages15
JournalSurface Topography: Metrology and Properties
Volume4
Issue number4
DOIs
Publication statusPublished - 1 Dec 2016

Keywords

  • AISI 4340 steel
  • double shot peening
  • friction
  • hardness
  • microstructure
  • shot peening
  • wear

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