Creation of fine grained-layer and high hardness-layer using IH-FPP treatment system and its effect on the fatigue properties of steel

Tsubasa Harada, Shoichi Kikuchi, Jun Komotori, Kengo Fukazawa, Yoshitaka Misaka, Kazuhiro Kawasaki

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In order to improve the fatigue properties of SCM435H steel, a surface treatment system was developed that combines high-frequency induction heating (IH) with fine particle peening (FPP). In this IH-FPP system, a compressed air spray from the FPP nozzle rapidly cools the specimen surface, which is pre-heated by the IH system. The specimen surface can be simultaneously modified by plastic deformation and quenching. The IH-FPP process was performed at temperatures ranging from 400-750°C. Vickers hardness and residual stress distributions were measured in order to examine the characteristics of the surface-modified layer created by the developed process. Surface microstructures were also observed using an optical microscope. As a result, the developed processes from 650-750°C created a surface with a high hardness and an extremely fine-grained microstructure. The fine-grained microstructure was created due to dynamic recrystallization. In order to clarify the effects of the IH-FPP treatment on fatigue strength of notched SCM435H steel with a stress concentration factor of K t =2.36, fatigue tests were performed at room temperature using a rotational bending fatigue testing machine. The specimen treated by IH-FPP process at 700°C exhibited the highest fatigue strength. This was because micro crack initiation and propagation were inhibited by the surface modified layer with high hardness and fine-grain. This result suggests that the IH-FPP treatment process is highly effective in improving the fatigue strength of steel.

Original languageEnglish
Pages (from-to)1091-1096
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume60
Issue number12
DOIs
Publication statusPublished - 2011 Dec

Fingerprint

peening
induction heating
Shot peening
Induction heating
Steel
hardness
Hardness
steels
Fatigue of materials
microstructure
Microstructure
Stress concentration
fatigue testing machines
bending fatigue
compressed air
Fatigue testing
Dynamic recrystallization
fatigue tests
Vickers hardness
stress concentration

Keywords

  • Dynamic recrystallization
  • Fatigue
  • Hardness
  • Induction heating
  • Peening
  • Residual stress

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Creation of fine grained-layer and high hardness-layer using IH-FPP treatment system and its effect on the fatigue properties of steel. / Harada, Tsubasa; Kikuchi, Shoichi; Komotori, Jun; Fukazawa, Kengo; Misaka, Yoshitaka; Kawasaki, Kazuhiro.

In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 60, No. 12, 12.2011, p. 1091-1096.

Research output: Contribution to journalArticle

Harada, Tsubasa ; Kikuchi, Shoichi ; Komotori, Jun ; Fukazawa, Kengo ; Misaka, Yoshitaka ; Kawasaki, Kazuhiro. / Creation of fine grained-layer and high hardness-layer using IH-FPP treatment system and its effect on the fatigue properties of steel. In: Zairyo/Journal of the Society of Materials Science, Japan. 2011 ; Vol. 60, No. 12. pp. 1091-1096.
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