The surface treatment influence on the fatigue crack propagation of Al 7050-T7451 alloy

Autor(es)

Carvalho, A. L. M. ^[1] ; Voorwald, H. J. C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Ponta Grossa, Dept Mat Engn, BR-4748 Ponta Grossa - Brazil

^[2] State Univ Sao Paulo UNESP FEG, Dept Mat & Technol, Guaratingueta, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 505, n. 1-2, p. 31-40, APR 15 2009.
• Citações Web of Science: 15

Resumo

The objective of this research is to evaluate 100 mu m, thickness hard chromium electroplated coating on the fatigue crack propagation of Al 7050-T7451 alloy. The shot peening process was carried out to create residual stresses using ceramic and glass shots. Reverse bending fatigue tests were performed with base material, base material chromium electroplated and base material shot peened and chromium electroplated. In order to study the influence of residual stresses on fatigue life, the compressive residual stress field was measured by an X-ray diffraction method. Scanning electron microscopy technique was used to analyze fracture surface and identify crack origin sites. Glass shot peening results are better with respect to fatigue crack nucleation and propagation in comparison to ceramic shot peening. An overpeening may have occurred which produced damages on the ceramic shot peened surface. (C) 2008 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 99/10473-4 - Efeito das tensões residuais na fratura e resistência a fadiga da liga de alumínio 7050-T7451
• Beneficiário: André Luis Moreira de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Doutorado