Toward understanding the effect of remelting on the additively manufactured NiTi

Bayati, Parisa; Safaei, Keyvan; Nematollahi, Mohammadreza; Jahadakbar, Ahmadreza; Yadollahi, Aref; Mahtabi, Mohammad J.; Elahinia, Mohammad

doi:10.1007/s00170-020-06378-4

Cited by 23 publications

(9 citation statements)

References 83 publications

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“…High surface roughness of an as-built AM part correlates with the fatigue performance in a negative way (Dhansay et al, 2014;Molaei and Fatemi, 2018;Shrestha et al, 2019). As-built components with an outer surface with relatively high surface roughness influence the fatigue life of loaded components under, compressive, tensional and bending forces (Balachandramurthi et al, 2018;Bayati et al, 2020;Becker et al, 2020). Similar conclusions are drawn regardless of metal alloy regarding a negative relationship between an increase in surface roughness and lower fatigue performance, particularly in the as-built state (Harada et al, 2020;du Plessis and Beretta, 2020;Sprengel et al, 2019).…”

Section: Iced21mentioning

confidence: 64%

“…Surface roughness has also been shown to have a negative effect between the increasing degree of surface roughness and properties such as elongation at break (Ellis et al, 2015), creep (Viespoli et al, 2020) and bending (Frkán et al, 2017). Other commonly researched properties of LPBF materials include compressive strength (Bayati et al, 2020), tribological features (Mondragón-Rodríguez et al, 2020) tensile strength and elongation (Harada et al, 2020).…”

Section: Iced21mentioning

confidence: 99%

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Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

2021

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One often-cited benefit of using metal additive manufacturing (AM) is the possibility to design and produce complex geometries that suit the required function and performance of end-use parts. In this context, laser powder bed fusion (LPBF) is one suitable AM process. Due to accessibility issues and cost-reduction potentials, such ‘complex’ LPBF parts should utilise net-shape manufacturing with minimal use of post-process machining. The inherent surface roughness of LPBF could, however, impede part performance, especially from a structural perspective and in particular regarding fatigue. Engineers must therefore understand the influence of surface roughness on part performance and how to consider it during design. This paper presents a systematic literature review of research related to LPBF surface roughness. In general, research focuses on the relationship between surface roughness and LPBF build parameters, material properties, or post-processing. Research on design support on how to consider surface roughness during design for AM is however scarce. Future research on such supports is therefore important given the effects of surface roughness highlighted in other research fields.

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Section: Iced21mentioning

confidence: 64%

Section: Iced21mentioning

confidence: 99%

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

2021

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“…Besides controlling the process parameters, selective laser remelting (SLRM) is a novel approach that can be used in the LPBF process to smoothen upfacing surfaces. 75 Remelting is also a useful technique for increasing the density and reducing the porosity (Fig. 6).…”

Section: Surface Roughnessmentioning

confidence: 99%

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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“…Additive manufacturing of Nitinol has also been proposed for fabricating patient-specific cardiovascular implants and joint replacement implants. Thermomechanical properties of the AM fabricated Nitinol parts, such as mechanical fatigue, has also been studied [137,138] to some extends.…”

Section: Nickel-titanium Alloy (Nitinol)mentioning

confidence: 99%

Biomechanics of Additively Manufactured Metallic Scaffolds—A Review

et al. 2021

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This review paper is related to the biomechanics of additively manufactured (AM) metallic scaffolds, in particular titanium alloy Ti6Al4V scaffolds. This is because Ti6Al4V has been identified as an ideal candidate for AM metallic scaffolds. The factors that affect the scaffold technology are the design, the material used to build the scaffold, and the fabrication process. This review paper includes thus a discussion on the design of Ti6A4V scaffolds in relation to how their behavior is affected by their cell shapes and porosities. This is followed by a discussion on the post treatment and mechanical characterization including in-vitro and in-vivo biomechanical studies. A review and discussion are also presented on the ongoing efforts to develop predictive tools to derive the relationships between structure, processing, properties and performance of powder-bed additive manufacturing of metals. This is a challenge when developing process computational models because the problem involves multi-physics and is of multi-scale in nature. Advantages, limitations, and future trends in AM scaffolds are finally discussed. AM is considered at the forefront of Industry 4.0, the fourth industrial revolution. The market of scaffold technology will continue to boom because of the high demand for human tissue repair.

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Toward understanding the effect of remelting on the additively manufactured NiTi

Cited by 23 publications

References 83 publications

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

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

Biomechanics of Additively Manufactured Metallic Scaffolds—A Review

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