Abstract
Additive manufacturing (AM) processes are not solely used where maximum design freedom meets low lot sizes. Direct microstructure design and topology optimization can be realized concomitantly during processing by adjusting the geometry, the material composition, and the solidification behavior of the material considered. However, when complex specific requirements have to be met, a targeted part design is highly challenging. In the field of biodegradable implant surgery, a cytocompatible material of an application-adapted shape has to be characterized by a specific degradation behavior and reliably predictable mechanical properties. For instance, small amounts of oxides can have a significant effect on microstructural development, thus likewise affecting the strength and corrosion behavior of the processed material. In the present study, biocompatible pure Fe was processed using electron powder bed fusion (E-PBF). Two different modifications of the Fe were processed by incorporating Fe oxide and Ce oxide in different proportions in order to assess their impact on the microstructural evolution, the mechanical response and the corrosion behavior. The quasistatic mechanical and chemical properties were analyzed and correlated with the final microstructural appearance.
Highlights
In implant surgery, progress in material science and engineering is crucial for a continuous improvement of application adapted implants to support a patient’s recovery.an understanding of the specific necessities in implant design including strength, surface properties, and chemical behavior on the one hand, and adequate process routes to achieve these properties on the other hand, is required.Emerging processes allowing the establishment of these specific properties are found in the field of powder bed additive manufacturing (PB-Additive manufacturing (AM)), namely, laser powder bed fusion (L-PBF) and electron powder bed fusion (E-PBF)
The present study focused on the effects of Fe2 O3 and CeO2 NP modifications on cp Fe processed via E-PBF, applying constant process parameters
Grain refinement in consequence of the use of the oxides acting as nucleation sites could not be clearly observed, since the cp Fe is already characterized by relatively small grains induced by intrinsic heat treatment and multiple phase transformations during layer-wise production
Summary
Progress in material science and engineering is crucial for a continuous improvement of application adapted implants to support a patient’s recovery.an understanding of the specific necessities in implant design including strength, surface properties, and chemical behavior on the one hand, and adequate process routes to achieve these properties on the other hand, is required.Emerging processes allowing the establishment of these specific properties are found in the field of powder bed additive manufacturing (PB-AM), namely, laser powder bed fusion (L-PBF) and electron powder bed fusion (E-PBF). The use of Ti-6-4 [6–9], AISI 316L [10,11], and CoCr-based alloys [6,12] is most common in medical applications These alloys are characterized by relatively high strength and good corrosion resistance. Such permanent implants are known to contain certain risks: stress shielding as a result of high stiffness of such alloys in bulk form is known to promote bone resorption and, eventually, an aggravated healing process [6,7,9,13]. This underlines the need for implants with adapted geometries, e.g., filigree lattice structures or Alloys 2022, 1, 31–53.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call