Matériaux & Techniques
Volume 78, Number 9-10, 1990
|Page(s)||27 - 34|
|Published online||13 April 2017|
Traitement thermique superficiel des aciers frittés. Effet du traitement de surface par laser de puissance sur la microstructure et la tenue en fatigue des aciers frittés
The effect of a laser surface heat treatment on the microstructure and fatigue life of sintered steels
1 École Centrale de Paris ; Laboratoire. MSS-MAT/URA CNRS n° 850.
2 Alliages Frittés Metafram
Laser surface modification of sintered steels has been studied as a function of processing parameters such as power density and interaction time. Two microstructural changes were obtained depending on laser processing : surface remelting or surface quenching. In both cases the microstructure has been characterized by optical microscopy and microhardness measurements.
Fatigue life, measured in plane bending stress, is increased when surface remelting by laser has been performed on the specimens. This result confirms that in sintered products fatigue life is essentially governed by the crack initiation stage : remelting of the surface by laser tends to lower the superficial porosity thus delaying the formation of a critical size defect at the surface. For the alloys studied surface quenching induced only a slight detrimental effect on fatigue life.
These results are confirmed by Scanning Electron Microscopy observations of the fractured surface.
© SIRPE 1990
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