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In this paper the fatigue damage occurring in laser surface remelted AISI 316L specimens has been investigated by metallographic and X-ray diffraction (XRD) methods and compared to that of the corresponding untreated material. In depth investigation of microstructure, microhardness, residual stresses sin(2)psi-method and lattice distortions (X-ray diffraction line breadth) suggest that the fatigue damage is accompanied by a preferential cyclic strain hardening of the material surface and that fatigue fracture corresponds to the attainment of a critical cyclic hardening state at the surface. An interaction between the surface and the bulk has also been observed. A fatigue damage parameter derived from XRD measurements is proposed. The improvement of the fatigue behaviour obtained by the laser surface treatment is attributed to the microstructural changes at the surface and to the modification of the mechanical properties of both the surface and the bulk.

Additional information

Authors: OLCHINI A, JRC Ispra (IT);HAEHNER P, JRC Ispra (IT);STAMM H, JRC Ispra (IT)
Bibliographic Reference: Article: Materials Science and Engineering A (1996)
Record Number: 199611186 / Last updated on: 1996-10-28
Original language: en
Available languages: en