Abstract
In this work, there are published results about fatigue endurance of ductile cast iron obtained at high-frequency sinusoidal cyclic push-pull loading in the ultra-high cycle fatigue region. The main attention was focused on the fatigue lifetime data scatter caused by the influence of microscopic casting defects (microshrinkages, microbubbles, microcracks, non-metallic inclusions and local clusters of big graphitic nodules).
Highlights
Graphite cast irons are the important group of cast structural materials, with the wide range of application in the industry
Authors in this study present their own experimental results of the influence of small casting defects on the ultra-high cycle fatigue properties of LGG
The castings with these defects are mostly unrepairable and in the production of a casting of the dynamically loaded parts with such errors should be discarded. These defects are caused by the presence of gases in the molten metals and the form and by the volume changes of the casting during the solidification of metal. They can be divided into macroscopic cavities, and microscopic cavities
Summary
Graphite cast irons are the important group of cast structural materials, with the wide range of application in the industry. The special important is the group of cast irons with the spheroidal shape of graphite particles (LGG), which are frequently used in the automotive industry and in the heavy earthmoving machinery. Their wide range of applications is due to their economist, good technological properties and their ability to damp vibrations. Fatigue properties of LGG, despite intensive research, are not yet fully described It is well known, that fatigue tests of this category of materials show a significant scattering of the measured data. Authors in this study present their own experimental results of the influence of small (microscopic) casting defects on the ultra-high cycle fatigue properties of LGG
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