Abstract
This paper presents a study of the high-cycle fatigue behaviour of normalised 1045 AISI steel after laser polishing in a N2 atmosphere. When laser polishing is done in air, the surface layer has pores, inclusions and oxides, which are detrimental to the fatigue strength; however, laser polishing in N2 produces better surface features and fatigue-behaviour. With the laser parameters used in this study, a heat-affected zone of about 100μm appears in the surface where the residual stresses are compressive. In this zone, the metallurgical structure is martensitic and ferritic because the pearlitic zones have changed to martensitic during the laser-polishing process, while the ferritic ones have remained unchanged. Fatigue tests showed that the fatigue strength is scarcely affected by laser polishing in N2. This paper also provides quantitative data and calculation procedures useful for the fatigue analysis of 1045 AISI steel components finished by laser polishing in an inert atmosphere.
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