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Effect of filter coating on strength and deformation behavior of 42CrMo4 steelWednesday (07.10.2020) 14:40 - 15:00 Room 2 Part of:
The effect of filter coating on the strength and deformation behavior of the quenched and tempered steel was investigated at different temperatures and at quasi-static loading rates. To this end, the steel melt was purposely oxidized and deoxidized in order to produce alumina particles. Then, the steel melt was poured through an open-foam carbon-bonded alumina filter. Different filter coatings were studied: a mixture of carbon nano tubes and alumina nano sheets, flame-sprayed alumina, and no coating. After solidification, the steel was hot-isostatically pressed in order to reduced shrinkage porosity. The quality of the steel, i.e. the inclusion content and the mechanical properties, were evaluated by metallographic analysis (light microscopy and scanning electron microscopy) and by quasi-static tensile tests at different temperatures. The uncoated filter resulted in the highest inclusion content, whereas the flame-sprayed alumina coating led to the lowest content. However, the largest inclusions were found after the usage of the flame-sprayed alumina coating. Furthermore, this coating resulted in the highest strength and lowest ductility.