Processing of New Materials by Additive Manufacturing: Iron-Based Alloys Containing Silver for Biomedical Applications
- PDF / 796,308 Bytes
- 5 Pages / 593.972 x 792 pts Page_size
- 45 Downloads / 244 Views
NIENDORF, Group Leader, is with the Institut fu¨r Werkstofftechnik (Materials Engineering), Technische Universita¨t Bergakademie Freiberg, 09599 Freiberg, Germany. Contact e-mail: [email protected] FLORIAN BRENNE and PETER HOYER, Research Assistants, and MIRKO SCHAPER, Professor, are with the Lehrstuhl fu¨r Werkstoffkunde (Materials Science), Universita¨t Paderborn, 33098 Paderborn, Germany. DIETER SCHWARZE, Process Development Manager, is with the SLM Solutions GmbH, 23556 Lu¨beck, Germany. RICHARD GROTHE, Graduate Student, MARKUS WIESENER, Research Assistant, and GUIDO GRUNDMEIER, Professor, are with the Lehrstuhl fu¨r Technische Chemie (Technical Chemistry), Universita¨t Paderborn, 33098 Paderborn, Germany. HANS JU¨RGEN MAIER, Professor, is with the Institut fu¨r Werkstoffkunde (Materials Science), Leibniz Universita¨t Hannover, 30823 Garbsen, Germany. Manuscript submitted December 7, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS A
Metal alloy development is a very important topic in the field of biomaterials. While in some cases metal alloys should not only be biocompatible but also at the same time highly corrosion resistant, bioresorbable metal alloys provide superior functionality in certain applications.[1–6] While magnesium alloys are already broadly discussed in this context,[1–3] iron-based alloys were less studied.[4–6] High-manganese steels showing twinning-induced plasticity (TWIP) are very promising due to their excellent mechanical properties. However, in most cases, it is reported that the passivation of the steel substrate leads to a too low dissolution rate.[4–6] To increase the corrosion rate the passivation can be deteriorated by the inclusion of alloying elements, which form local cathodes and thereby promote the anodic dissolution of the iron-rich phase.[4,5] Conventional manufacturing techniques do not allow for manufacturing of certain alloys. Often this can be attributed to an immiscibility of the elements needed for alloy design. Conventional casting techniques suffer separation of elements. So far, this could only be counteracted by high processing effort, such as microgravity conditions or vertical strip-casting routines. Still, the results show rather inhomogeneous particle distributions.[7,8] Recently, new processing techniques have come into focus, which allow for overcoming traditional processing limitations. Additive manufacturing (AM) techniques such as selective electron-beam melting or selective laser melting allow for a layerwise manufacturing of parts by local melting of metal powders leading to an unprecedented design freedom.[9–11] The melt pool in these processes is very small with respect to the overall part dimensions, leading to unique processing conditions.[9–12] Potentially, this also affects the processability of mixtures of immiscible metals, which, however, has not been considered in literature, yet. By focusing on iron-based alloys the current work exemplarily sheds light on new materials that can uniquely be processed by AM and introduces their novel cha
Data Loading...
