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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/9398
Title: 
Improvement in the fatigue strength of chromium electroplated AISI 4340 steel by shot peening
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
8756-758X
Sponsorship: 
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Sponsorship Process Number: 
  • CNPq: 350496/2003
  • CNPq: 354155/2006-3
  • CNPq: 470074/2006-0
  • FAPESP: 06/03570-9
Abstract: 
In landing gear, an important mechanical component for high responsible applications, wear and corrosion control is currently accomplished by chrome plating or hard anodising. However, some problems are associated with these operations. Experimental results have also shown that chrome-plated specimens have fatigue strength lower than those of uncoated parts, attributed to high residual tensile stress and microcracks density contained into the coating. Under fatigue conditions these microcracks propagate and will cross the interface coating-substrate and penetrate base metal without impediment. Shot peening is a surface process used to improve fatigue strength of metal components due to compressive residual stresses induced in the surface layers of the material, making the nucleation and propagation of fatigue cracks difficult. This investigation is concerned with analysis of the shot peening influence on the rotating bending fatigue strength of hard chromium electroplated AISI 4340 steel. Specimens were submitted to shot peening treatment with steel and ceramic shots and, in both cases, experimental results show increase in the fatigue life of AISI 4340 steel hard chromium electroplated, up to level of base metal without chromium. Peening using ceramic shot resulted in lower scatter in rotating bending fatigue data than steel shots.
Issue Date: 
1-Feb-2009
Citation: 
Fatigue & Fracture of Engineering Materials & Structures. Malden: Wiley-blackwell Publishing, Inc, v. 32, n. 2, p. 97-104, 2009.
Time Duration: 
97-104
Publisher: 
Wiley-Blackwell Publishing, Inc
Keywords: 
  • brittle and ductile fracture
  • coatings
  • fatigue life
  • fracture mechanics
  • mechanical properties
  • steels and alloys
Source: 
http://dx.doi.org/10.1111/j.1460-2695.2008.01314.x
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/9398
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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