Affiliation:
1. Technische Universität Wien, Institut für Chemische Technologien und Analytik , Getreidemarkt 9/164-03, A-1060 Wien Austria
Abstract
Abstract
Just as 10 years ago, an examination of drills used in human medicine revealed cracks in the microstructure which can be attributed to fractured carbides. The drills are made of corrosion-resistant chromium steels with special carbides which are of the composition (Cr,Fe)23C6 and (Cr,Fe)7C3 (e. g. material no. 1.4125 or 1.4112). The cracks occur in the coarser carbides during the forming of the drills. It was considered problematic that the cracks are filled with contaminants which cannot be fully removed in the cleaning process. One of the drills examined for this study also contained MnS inclusions which is consistent with a “rust and acidresistant steel / free-machining steel” (e. g. material no. 1.4005).
Subject
Metals and Alloys,Mechanics of Materials,Condensed Matter Physics,Electronic, Optical and Magnetic Materials
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