研究目的
Investigating the scalable laser powder bed fusion processing of nitinol shape memory alloy to enable the fabrication of complex NiTi parts.
研究成果
The study successfully demonstrated a method for scalable fabrication of complex NiTi parts by optimizing laser parameters and introducing a lattice support structure to mitigate build plate adhesion issues. This approach enables the production of large-scale shape memory components with complex geometry, not possible with conventional manufacturing techniques.
研究不足
The study identified challenges with build plate reactivity and adhesion, which were mitigated but not completely eliminated. The formation of brittle intermetallics at the part/build plate interface and delamination due to thermal stresses were key limitations.
1：Experimental Design and Method Selection:
The study involved single-track laser parameter sweeps to assess melt pool stability and determine energy parameters and hatch spacing for larger builds.
2：Sample Selection and Data Sources:
NiTi powder was used, produced via electrode induction gas atomization (EIGA) of a 55Ni–45Ti wt% bar in an argon environment.
3：List of Experimental Equipment and Materials:
A Renishaw AM400 Selective Laser Melting (SLM) system was used, along with a Thermo Scienti?c Scios scanning electron microscope (SEM) for imaging and EDS analysis, and a Zeta-20 optical pro?lometer for top-down morphology determination.
4：Experimental Procedures and Operational Workflow:
Single tracks were produced with variations in laser power, point distance, and exposure time. The tracks were then characterized for melt pool shape and quality.
5：Data Analysis Methods:
The composition of tracks was evaluated using SEM and EDS, and XRCT was used for nondestructive evaluation of the single tracks and build plate interactions.
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