Evaluating residual stress in additively manufactured nitinol shape memory alloy
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| Udgivet i: | NPJ Advanced Manufacturing vol. 2, no. 1 (Dec 2025), p. 16 |
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| Andre forfattere: | , , , , , , |
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| 022 | |a 3004-8621 | ||
| 024 | 7 | |a 10.1038/s44334-025-00027-y |2 doi | |
| 035 | |a 3225849542 | ||
| 045 | 2 | |b d20251201 |b d20251231 | |
| 100 | 1 | |a Rangaswamy, Sampreet |u Dublin City University, Advanced Processing Technology Research Centre, School of Mechanical & Manufacturing Engineering, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000 0001 0238 0260); Dublin City University, I-Form Advanced Manufacturing Research Centre, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000000102380260) | |
| 245 | 1 | |a Evaluating residual stress in additively manufactured nitinol shape memory alloy | |
| 260 | |b Nature Publishing Group |c Dec 2025 | ||
| 513 | |a Journal Article | ||
| 520 | 3 | |a This study provides a comprehensive analysis of residual stress characteristics in nitinol parts fabricated via laser powder bed fusion (PBF-LB). Unlike previous works that primarily focus on qualitative assessments or single-measurement techniques, this research employs a multi-modal experimental approach, Electronic Speckle Pattern Interferometry-Hole Drilling (ESPI-HD) and X-ray Diffraction (XRD), to achieve a more precise and spatially resolved evaluation of residual stress distribution. Furthermore, the study establishes a direct correlation between residual stress evolution and in situ pyrometric melt pool temperature data, an aspect that has not been extensively explored in prior investigations. A key novel finding is the non-monotonic relationship between volumetric energy density (VED) and residual stress. In this work, laser power was kept constant, and VED was varied by adjusting scanning speed and hatch spacing. The results show that the average residual stress initially increases with decreasing scan speed and hatch spacing, plateaus at a critical threshold, and subsequently decreases. However, residual stress was also found to vary in the build direction, indicating the complex stress distributions and accommodation mechanisms within the material. Additionally, an inverse relationship was recorded between the thermal gradient and VED which challenges conventional assumptions about their relationship. These insights offer a new perspective on optimizing PBF-LB process parameters for enhanced structural performance and long-term reliability of additively manufactured nitinol. | |
| 653 | |a Heat treating | ||
| 653 | |a Interferometry | ||
| 653 | |a Powder beds | ||
| 653 | |a Speckle patterns | ||
| 653 | |a Residual stress | ||
| 653 | |a Lasers | ||
| 653 | |a Temperature | ||
| 653 | |a Intermetallic compounds | ||
| 653 | |a Equilibrium | ||
| 653 | |a Melting | ||
| 653 | |a Measurement techniques | ||
| 653 | |a Methods | ||
| 653 | |a Diffraction patterns | ||
| 653 | |a Stress analysis | ||
| 653 | |a Shape memory alloys | ||
| 653 | |a Additive manufacturing | ||
| 653 | |a Melt pools | ||
| 653 | |a Stress distribution | ||
| 653 | |a Nickel titanides | ||
| 653 | |a Electronic speckle pattern interferometry | ||
| 653 | |a Process parameters | ||
| 700 | 1 | |a Chekotu, Josiah Cherian |u Dublin City University, Advanced Processing Technology Research Centre, School of Mechanical & Manufacturing Engineering, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000 0001 0238 0260); Dublin City University, I-Form Advanced Manufacturing Research Centre, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000000102380260) | |
| 700 | 1 | |a Gillick, Thomas |u Dublin City University, Advanced Processing Technology Research Centre, School of Mechanical & Manufacturing Engineering, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000 0001 0238 0260); Dublin City University, I-Form Advanced Manufacturing Research Centre, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000000102380260) | |
| 700 | 1 | |a Hughes, Cian |u Dublin City University, Advanced Processing Technology Research Centre, School of Mechanical & Manufacturing Engineering, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000 0001 0238 0260); Dublin City University, I-Form Advanced Manufacturing Research Centre, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000000102380260) | |
| 700 | 1 | |a Nicholl, Jayne |u University of Strathclyde, National Manufacturing Institute Scotland, Glasgow, UK (GRID:grid.11984.35) (ISNI:0000 0001 2113 8138) | |
| 700 | 1 | |a Easton, David |u University of Strathclyde, National Manufacturing Institute Scotland, Glasgow, UK (GRID:grid.11984.35) (ISNI:0000 0001 2113 8138) | |
| 700 | 1 | |a Şimşir, Caner |u Middle East Technical University, Department of Metallurgical and Materials Engineering, Ankara, Turkey (GRID:grid.6935.9) (ISNI:0000 0001 1881 7391) | |
| 700 | 1 | |a Brabazon, Dermot |u Dublin City University, Advanced Processing Technology Research Centre, School of Mechanical & Manufacturing Engineering, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000 0001 0238 0260); Dublin City University, I-Form Advanced Manufacturing Research Centre, Dublin, Ireland (GRID:grid.15596.3e) (ISNI:0000000102380260) | |
| 773 | 0 | |t NPJ Advanced Manufacturing |g vol. 2, no. 1 (Dec 2025), p. 16 | |
| 786 | 0 | |d ProQuest |t Materials Science Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/3225849542/abstract/embedded/75I98GEZK8WCJMPQ?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text |u https://www.proquest.com/docview/3225849542/fulltext/embedded/75I98GEZK8WCJMPQ?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/3225849542/fulltextPDF/embedded/75I98GEZK8WCJMPQ?source=fedsrch |