Artículos de revistas
The surface treatment influence on the fatigue crack propagation of Al 7050-T7451 alloy
Fecha
2009-04-15Registro en:
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing. Lausanne: Elsevier B.V. Sa, v. 505, n. 1-2, p. 31-40, 2009.
0921-5093
10.1016/j.msea.2008.10.053
WOS:000264364100006
3511534795805776
Autor
Universidade Estadual de Ponta Grossa (UEPG)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
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.