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Abstract

The effect of laser surface treatment (LST) on the fatigue behaviour of the austenitic stainless steel AISI 316L was investigated. Two types of specimen geometries were examined: flat specimens which were fatigued in pure tension in order to avoid buckling, and cylindrical specimens with round cross-section which were fatigued in fully reversed push-pull mode. The LST specimens were subjected to surface melting using a CO(2) laser. The results of fatigue testing were compared with those of electrolytically polished reference specimens. For flat specimens the laser surface melting yields an increase of the fatigue limit by 8 %. The cylindrical specimens show significantly longer life- times after LST at stress amplitudes well above the fatigue limit of the reference specimens. It is suggested that the grain-size refinement in the rapidly resolidified surface layer is responsible for the improvement of the fatigue behaviour.

Additional information

Authors: HOLZWARTH U, JRC Ispra (IT);STAMM H, JRC Ispra (IT);BOERMAN D J, JRC Ispra (IT);OLCHINI A, JRC Ispra (IT);DOS SANTOS MARQUES F, JRC Ispra (IT);ZAUSCH R, JRC Ispra (IT)
Bibliographic Reference: Paper presented: EURO MAT 95, Venice (IT), September 25-28, 1995
Availability: Available from (1) as Paper EN 39292 ORA
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