Building orientation-structure-property in laser powder bed fusion of NiTi shape memory alloy

Nematollahi, Mohammadreza; Saghaian, Sayed Ehsan; Safaei, Keyvan; Bayati, Parisa; Bassani, Paola; Biffi, Carlo Alberto; Tuissi, A.; Karaca, H.E.; Elahinia, Mohammad

doi:10.1016/j.jallcom.2021.159791

Cited by 55 publications

(22 citation statements)

References 66 publications

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“…7c, d). 79,80 Besides the grain morphology, the grain orientation is also influenced by the thermal history resulting from the AM process. Crystals with cubic structure have an easy growth direction toward <100> 81 during solidification.…”

Section: Microstructure Of Niti Alloy Processed By Lpbf: Grain Morphology Texture and Precipitationmentioning

confidence: 99%

“…8b, the orientation of the parts in the build plate remarkably affects their crystallographic texture. 80 Although the orientation of the parts does not affect the strong <001> texture formed parallel to the build direction, it does alter the texture along the load direction, thus profoundly affecting the thermomechanical behavior.…”

Section: Microstructure Of Niti Alloy Processed By Lpbf: Grain Morphology Texture and Precipitationmentioning

confidence: 99%

“…101,102 Besides the anisotropic behavior seen in different stress states, the preferred grain orientation of LPBF parts also leads to remarkable anisotropy. 80,84 As described above, the NiTi microstructure resulting from the LPBF process typically comprises columnar grains with the favorable <001> orientation. Such a microstructural texture results in anisotropic thermomechanical behavior that is unsuitable for most applications involving multiaxial loading.…”

Section: Thermomechanical Behavior Of Lpbf Niti Alloymentioning

confidence: 99%

“…103,104 NiTi samples processed by LPBF show good agreement with the theoretical transformation strain for the<001> direction in the compression mode, but this is not the case in the tension mode. 80,84,105 In tensile loading, defects caused by AM significantly affect the mechanical behavior of NiTi parts. The presence of such defects in NiTi tensile samples results in premature failure, lower fatigue life, and higher irrecoverable strain.…”

Section: Thermomechanical Behavior Of Lpbf Niti Alloymentioning

confidence: 99%

“…107 LPBF-fabricated NiTi alloys show brittle behavior under tension with elongation normally less than 8%. 33,80,97 However, some studies recently succeeded in achieving elongation of more than 15% by adopting optimized process and building parameters. 52,78 The brittle oxide phase Ti 4 Ni 2 O x formed during the LPBF process degrades the performance of as-built samples.…”

Section: Thermomechanical Behavior Of Lpbf Niti Alloymentioning

confidence: 99%

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Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Safaei

Abedi

Nematollahi

et al. 2021

JOM

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NiTi shape memory alloys (SMAs) are used in a broad range of biomedical applications because of their unique properties including biocompatibility and high corrosion and wear resistance as well as functional properties such as superelasticity and the shape memory effect. The combination of SMAs and additive manufacturing can lead to revolutionary changes to the uses of SMAs in the biomedical industry. This article discusses the potential biomedical applications of NiTi that benefit from the AM process. We share the lessons learned in processing NiTi alloys with a focus on the laser powder bed fusion (LPBF) technique. The manufacturability, build quality, stable phases and transformation temperatures, microstructure, thermomechanical properties, microstructure tailoring, and functional properties of NiTi alloys produced via AM processing are reviewed. Current challenges such as expanding the process window, controlling the chemistry, and the performance and property responses are discussed, and potential opportunities including alloy design are discussed.

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Section: Microstructure Of Niti Alloy Processed By Lpbf: Grain Morphology Texture and Precipitationmentioning

confidence: 99%

Section: Microstructure Of Niti Alloy Processed By Lpbf: Grain Morphology Texture and Precipitationmentioning

confidence: 99%

Section: Thermomechanical Behavior Of Lpbf Niti Alloymentioning

confidence: 99%

Section: Thermomechanical Behavior Of Lpbf Niti Alloymentioning

confidence: 99%

Section: Thermomechanical Behavior Of Lpbf Niti Alloymentioning

confidence: 99%

See 3 more Smart Citations

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Safaei

Abedi

Nematollahi

et al. 2021

JOM

Self Cite

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The Build Orientation Dependency of NiTi Shape Memory Alloy Processed by Laser Powder Bed Fusion

Safaei

Andani

Nematollahi

et al. 2022

Shap. Mem. Superelasticity

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Building Orientation and Heat Treatments Effect on the Pseudoelastic Properties of NiTi Produced by LPBF

Carlucci

Patriarca

Demir

et al. 2022

Shap. Mem. Superelasticity

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NiTi dominates the market of shape memory materials due to its optimal combination of mechanical, functional, and biocompatibility properties, which enabled its use for several applications, in particular for the biomedical and the aerospace sectors. However, due to its poor machinability, NiTi is a challenging material from the manufacturing standpoint. Therefore, in the last years, researchers have focused on the production of NiTi components by additive manufacturing processes, which also enable the manufacturing of complex shape parts that cannot be produced with conventional methods. The aim of this study is to provide insights on the optimization of the functional performances of NiTi produced by Laser Powder Bed Fusion, leveraging on the building orientation and post-processing heat treatments. Uniaxial mechanical tests have been performed in tension and compression, and the influence of heat treatments and building orientation on the mechanical behavior of pseudoelastic NiTi has been evaluated. Different heat treatment schedules have been evaluated, leading to transformation strains up to 2.7% in tension and 4.6% in compression. This study confirms that Laser Powder Bed Fusion is a promising additive manufacturing technology for the production of net-shape and near defect-free NiTi components, exhibiting remarkable functional properties.

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Building orientation-structure-property in laser powder bed fusion of NiTi shape memory alloy

Cited by 55 publications

References 66 publications

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

The Build Orientation Dependency of NiTi Shape Memory Alloy Processed by Laser Powder Bed Fusion

Building Orientation and Heat Treatments Effect on the Pseudoelastic Properties of NiTi Produced by LPBF

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