Laser Polishing of Nickel-Titanium Shape Memory Alloy Produced via Laser Powder Bed Fusion

Chernyshikhin, Stanislav V.; Panov, D. V.; Tuan, Tran Van; Ozherelkov, Dmitriy Yu.; Sheremetyev, V.; Shishkovsky, Igor

doi:10.1007/s12540-023-01432-8

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…However, SLM technology still has considerable limitations compared with traditional and subtractive manufacturing processes [ 11 ]. The dimensional accuracy and surface quality of the parts produced through laser additive manufacturing are comparatively lower than those achieved by conventional machining methods, thereby impeding the widespread adoption of this innovative technique [ 12 , 13 , 14 ]. Additionally, the presence of subsurface porosity in LPBF parts also limits the standardization and widespread nature of the technology due to the deterioration of the mechanical properties, especially fatigue life [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Laser Polishing of Ti6Al4V Fabricated by Selective Laser Melting

Huang,

Zeng,

Wang

et al. 2024

Micromachines

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Laser-based additive manufacturing has garnered significant attention in recent years as a promising 3D-printing method for fabricating metallic components. However, the surface roughness of additive manufactured components has been considered a challenge to achieving high performance. At present, the average surface roughness (Sa) of AM parts can reach high levels, greater than 50 μm, and a maximum distance between the high peaks and the low valleys of more than 300 μm, which requires post machining. Therefore, laser polishing is increasingly being utilized as a method of surface treatment for metal alloys, wherein the rapid remelting and resolidification during the process significantly alter both the surface quality and subsurface material properties. In this paper, the surface roughness, microstructures, microhardness, and wear resistance of the as-received, continuous wave laser polishing (CWLP), and pulsed laser polishing (PLP) processed samples were investigated systematically. The results revealed that the surface roughness (Sa) of the as-received sample was 6.29 μm, which was reduced to 0.94 μm and 0.84 μm by CWLP and PLP processing, respectively. It was also found that a hardened layer, about 200 μm, was produced on the Ti6Al4V alloy surface after laser polishing, which can improve the mechanical properties of the component. The microhardness of the laser-polished samples was increased to about 482 HV with an improvement of about 25.2% compared with the as-received Ti6Al4V alloy. Moreover, the coefficient of friction (COF) was slightly reduced by both CWLP and LPL processing, and the wear rate of the surface layer was improved to 0.790 mm3/(N∙m) and 0.714 mm3/(N∙m), respectively, under dry fraction conditions.

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Section: Introductionmentioning

confidence: 99%

Study on Laser Polishing of Ti6Al4V Fabricated by Selective Laser Melting

Huang,

Zeng,

Wang

et al. 2024

Micromachines

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Repetitive Nanosecond Laser-Induced Oxidation and Phase Transformation in NiTi Alloy

Choi,

Na,

Jun

et al. 2023

Met. Mater. Int.

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NiTi shape memory alloys, known as Nitinol, are highly valuable in medical fields for their unique attributes, including superelasticity, wear resistance, and biocompatibility. Laser treatment provides precise control over surface characteristics, enhancing biocompatibility. This study focuses on the effects of laser irradiation on NiTi alloy surfaces, particularly considering the number of laser scans and their impact on surface features. Even at low laser power, multiple high-frequency scans significantly alter surface roughness and induce phase transformation. After 16 repeated laser irradiations, amorphous Ti oxide transforms into crystalline anatase. Remarkably, anatase can further transform into rutile due to the influence of Ni nearby and TiO, due to insufficient oxygen content. The most notable outcome is the formation of a thick Ti oxide layer, causing unbound Ni to emerge on the surface, resulting in a Ni oxide layer. These findings highlight the importance of precisely adjusting laser parameters to achieve tailored surface properties for medical applications, addressing challenges and enhancing biocompatibility. Graphical abstract

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A comprehensive study on the effects of surface post-processing on fatigue performance of additively manufactured AlSi10Mg: An augmented machine learning perspective on experimental observations

Maleki,

Shamsaei

2024

Additive Manufacturing

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Laser Polishing of Nickel-Titanium Shape Memory Alloy Produced via Laser Powder Bed Fusion

Cited by 5 publications

References 53 publications

Study on Laser Polishing of Ti6Al4V Fabricated by Selective Laser Melting

Study on Laser Polishing of Ti6Al4V Fabricated by Selective Laser Melting

Repetitive Nanosecond Laser-Induced Oxidation and Phase Transformation in NiTi Alloy

A comprehensive study on the effects of surface post-processing on fatigue performance of additively manufactured AlSi10Mg: An augmented machine learning perspective on experimental observations

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