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LPBF Processability of NiTiHf Alloys: Systematic Modeling and Single-Track Studies.
Dabbaghi, Hediyeh; Pourshams, Mohammad; Nematollahi, Mohammadreza; Poorganji, Behrang; Kirka, Michael M; Smith, Scott; Chinnasamy, Chins; Elahinia, Mohammad.
Affiliation
  • Dabbaghi H; Department of Mechanical, Manufacturing, and Industrial Engineering, University of Toledo, Toledo, OH 43606, USA.
  • Pourshams M; Department of Mechanical, Manufacturing, and Industrial Engineering, University of Toledo, Toledo, OH 43606, USA.
  • Nematollahi M; Department of Mechanical, Manufacturing, and Industrial Engineering, University of Toledo, Toledo, OH 43606, USA.
  • Poorganji B; Department of Mechanical, Manufacturing, and Industrial Engineering, University of Toledo, Toledo, OH 43606, USA.
  • Kirka MM; Oak Ridge National Laboratory, Manufacturing Science Division, Energy Science and Technology Directorate, Oak Ridge, TN 37830, USA.
  • Smith S; Oak Ridge National Laboratory, Manufacturing Science Division, Energy Science and Technology Directorate, Oak Ridge, TN 37830, USA.
  • Chinnasamy C; Oak Ridge National Laboratory, Manufacturing Science Division, Energy Science and Technology Directorate, Oak Ridge, TN 37830, USA.
  • Elahinia M; Department of Mechanical, Manufacturing, and Industrial Engineering, University of Toledo, Toledo, OH 43606, USA.
Materials (Basel) ; 17(16)2024 Aug 22.
Article in En | MEDLINE | ID: mdl-39203328
ABSTRACT
Research into the processability of NiTiHf high-temperature shape memory alloys (HTSMAs) via laser powder bed fusion (LPBF) is limited; nevertheless, these alloys show promise for applications in extreme environments. This study aims to address this limitation by investigating the printability of four NiTiHf alloys with varying Hf content (1, 2, 15, and 20 at. %) to assess their suitability for LPBF applications. Solidification cracking is one of the main limiting factors in LPBF processes, which occurs during the final stage of solidification. To investigate the effect of alloy composition on printability, this study focuses on this defect via a combination of computational modeling and experimental validation. To this end, solidification cracking susceptibility is calculated as Kou's index and Scheil-Gulliver model, implemented in Thermo-Calc/2022a software. An innovative powder-free experimental method through laser remelting was conducted on bare NiTiHf ingots to validate the parameter impacts of the LPBF process. The result is the processability window with no cracking likelihood under diverse LPBF conditions, including laser power and scan speed. This comprehensive investigation enhances our understanding of the processability challenges and opportunities for NiTiHf HTSMAs in advanced engineering applications.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Materials (Basel) Year: 2024 Document type: Article Affiliation country: Country of publication:

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Materials (Basel) Year: 2024 Document type: Article Affiliation country: Country of publication: