Abstract
Surface roughness of the additively manufactured (AM) parts can reduce the service life, especially under dynamic loadings, due to promoting fatigue by providing initiation sites for fatigue cracks. Therefore, improving the surface condition of AM specimens can be a solution to increase the fatigue strength. The stiffness method is a rapid fatigue test method that allows to obtain reliable fatigue limit values in a cheaper and easier way than traditional methods. Consequently, this work aims to investigate the effect of surface roughness on the fatigue behavior of stainless steel AISI 316L specimens using the stiffness method. These specimens were printed with laser and electron beam powder bed fusion techniques. Different contour parameters were utilized to obtain different surface roughness values. The competitional effect of the internal defects, which become surface defects after machining, and the surface roughness of the as-built specimens, is also addressed by the stiffness method results.
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