Abstract
In this study, fatigue lifetime of two types of specimens with different volumes (given by the gauge length and the diameter of the central part of the specimen) subjected to high-frequency loading is investigated. Studied materials are austenitic stainless steels 1.4306 and 1.407, both commonly known as AISI 304L. An ultrasonic testing machine working at frequency of 20 kHz was used to reach very high cycle fatigue region. Fatigue tests were carried out under uniaxial symmetric tension/compression loading (R = - 1) at room temperature. The study includes a microstructural description of investigated materials, fracture surface analysis, and conclusions.
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