Influence of PRE-FPP (fine particle peening) on fatigue fracture mechanism of nitrided AISI 4135 steel

Shoichi Kikuchi, Keita Lshii, Jun Komotori

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new hybrid surface modification process: combination of a Fine Particle Peening (FPP) treatment and nitriding was proposed. In order to clarify the effects of the FPP treatment before nitriding (pre-FPP treatment) on fatigue strength and mechanism of notched AISI 4135 steel with stress concentration factor of 2.36, fatigue tests were carried out with a rotational bending fatigue testing machine at room temperature. Crack propagation rate, hardness and residual stress distributions were measured in order to investigate the high cycle fatigue properties. Surface hardness of the FPP treated specimen before nitriding was higher than that of the nitrided specimen. Surface microstructures of treated specimens were then characterized by a Scanning electron microscope (SEM), X-ray diffraction (XRD) and electron probe micro analyzer (EPMA). The compound layer of FPP treated specimen before nitriding was dense and stable. Therefore, the fatigue strength of the pre-FPP treated specimen was higher than that of the nitrided specimen. This suggests that the pre-FPP treatment process improves the fatigue strength of the nitrided specimen and also means that the FPP treatment before nitriding is very effective in improving the fatigue strength of steel.

Original languageEnglish
Title of host publication17th European Conference on Fracture 2008
Subtitle of host publicationMultilevel Approach to Fracture of Materials, Components and Structures
Pages866-873
Number of pages8
Publication statusPublished - 2008 Dec 1
Event17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 - Brno, Czech Republic
Duration: 2008 Sep 22008 Sep 5

Publication series

Name17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures
Volume1

Other

Other17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17
CountryCzech Republic
CityBrno
Period08/9/208/9/5

Keywords

  • Crack growth rate
  • Fatigue strength
  • Microstructures.
  • Shot peening
  • Surface treatments

ASJC Scopus subject areas

  • Civil and Structural Engineering

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  • Cite this

    Kikuchi, S., Lshii, K., & Komotori, J. (2008). Influence of PRE-FPP (fine particle peening) on fatigue fracture mechanism of nitrided AISI 4135 steel. In 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures (pp. 866-873). (17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures; Vol. 1).