|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alloy Development and Powder Manufacture for Additive Manufacturing
||Designing Fe-Ni-Al and Fe-Ni-Ti Maraging Steels for In-situ Precipitation Hardening during Laser Metal Deposition
||Philipp Kürnsteiner, Markus Benjamin Wilms, Andreas Weisheit, Eric Aimé Jägle, Dierk Raabe
|On-Site Speaker (Planned)
As neighboring tracks and subsequent layers are deposited during Additive Manufacturing processes the material experiences a cyclic reheating. The present study aims at exploiting this intrinsic heat treatment of the Laser Metal Deposition process to produce Maraging steel parts that are already in-situ precipitation hardened during the manufacturing process. For this purpose, graded samples in which the Al and Ti content, respectively, was increased layer by layer were produced. This allows fast and efficient screening of different alloy compositions.
In both alloys, optimum Al and Ti concentration were identified at which the material was strengthened by high number densities of intermetallic precipitates: NiAl and Ni3Ti, respectively. Mechanical properties were evaluated and related to the precipitation density, distribution and chemistry as found from Atome Probe Tomography and High Energy X-ray Diffraction. For example, 10<SUP>25</SUP>m<SUP>-3</SUP> NiAl nano-precipitates were formed in the Fe-Ni-Al maraging steel, associated with an increase in hardness of 250HV.
||Planned: Supplemental Proceedings volume