Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-921-C7-926
Determination of laser shock treatment conditions for fatigue testing of Ni-based superalloysP. FORGET1, M. JEANDIN1 and A. LYORET2
1 Ecole des Mines de Paris, Centre des Matériaux P.M. Fourt, BP. 87, 91003 Evry cedex, France
2 SNECMA, Centre de Corbeil, Département "Matériaux et Procédés", BP. 81, 91003 Evry cedex, France
It is envisaged that laser shock surface treatment may be used to surface harden and improve the mechanical properties of materials by inducing compressive stresses. This study deals with its application to the high performance aeronautical Ni-based superalloy Astroloy for turbine discs and its effect on low-cycle fatigue resistance. X-ray diffraction was used to measure the surface and in-depth stress distributions. The prominent features of laser shock processing have been studied by an analytical approach to the main physical phenomena occurring successively during the impact. This led to an adequate treatment of conventionnal cylindrical low-cycle fatigue specimens. Fatigue tests were then conducted on Astroloy at 550°C. These showed the beneficial effect of laser shock processing.
© EDP Sciences 1993