Effect of laser surface treatment on the high-cycle fatigue behaviour of AISI 316L stainless steel
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.
Bibliographic Reference: Paper presented: EURO MAT 95, Venice (IT), September 25-28, 1995
Availability: Available from (1) as Paper EN 39292 ORA
Record Number: 199511456 / Last updated on: 1996-08-30
Original language: en
Available languages: en