Improved fatigue strength of additively manufactured Ti6Al4V by surface post processing

Kahlin, Magnus; Ansell, Hans; Basu, Debabrata; Kerwin, A.; Newton, Lewis; Smith, Bethan; Moverare, Johan

doi:10.1016/j.ijfatigue.2020.105497

Cited by 169 publications

(62 citation statements)

References 23 publications

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“…Additionally, the amorphization produced in the surface inhibited crack propagation and thus improved the fatigue life. Kahlin et al [52] also obtained promising results with shotpeening, as well as with centrifugal finishing. In general, the fatigue behavior of additive manufactured parts of Ti-6Al-4V is dictated by the presence of bulk and surface defects, microstructural aspects, and residual stresses.…”

Section: Processing By Additive Manufacturingmentioning

confidence: 97%

“…The aforementioned concerns on the effects of surface roughness, alloy composition, and microstructure are additionally useful for additive manufactured parts. Although additive manufacturing of Ti-6Al-4V is known for the near-net-shape production of components, post-processing is commonly required to minimize the effects of roughness [52]. However, while these components are intended to be near-net-shaped, the complex geometry that is produced is expected to be used in the as-built form, rather than after post-processing [53], leading to a strong concern of a fatigue response.…”

Section: Processing By Additive Manufacturingmentioning

confidence: 99%

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A review on the recent advances concerning the fatigue performance of titanium alloys for orthopedic applications

Campanelli

2021

Journal of Materials Research

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This article presents a review on recent advances in the fatigue behavior of Ti alloys, especially the main commercial compositions for orthopedic applications. In the case of well‐known Ti–6Al–4V alloy, the major concern is related to the effect of the surface modification necessary to improve the osseointegration. The introduction of surface discontinuities due to the growth of a porous oxide layer, or the roughness development, may severely affect the fatigue performance depending on the level of alteration. In the case of additive manufactured Ti–6Al–4V, the fatigue response is also influenced by inherent defects of as‐built parts. Regarding the recently developed metastable β alloys, information about the fatigue properties is still scarce and mainly related to the effect of second phase precipitates, which are introduced to optimize the mechanical properties. The fatigue behavior of the Ti alloys is complex, as is their microstructure, and should not be neglected when the alloys are being developed or improved to be applied in medical devices.

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Section: Processing By Additive Manufacturingmentioning

confidence: 97%

Section: Processing By Additive Manufacturingmentioning

confidence: 99%

A review on the recent advances concerning the fatigue performance of titanium alloys for orthopedic applications

Campanelli

2021

Journal of Materials Research

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“…An already finished project studied "Optimization Techniques for MIMO Radar Antenna Systems" [596] and therefore, is not related to this review scope. On the other hand, the project "Innovative Re-Design and Validation of Complex Airframe Structural Components Formed by Additive Manufacturing for Weight and Cost Reduction" has been funded since 2017 until the current year under the framework of "Design Guide Lines and Simulation Methods for Additive Manufactured Titanium Components" and deployed significant publications [127,178,597,598]. While the research has been conducted with titanium as the primary material, the innovative approaches are applied in any engineering field where weight reduction is a major objective.…”

Section: Future Trendsmentioning

confidence: 99%

Topology Optimisation in Structural Steel Design for Additive Manufacturing

2021

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Topology Optimisation is a broad concept deemed to encapsulate different processes for computationally determining structural materials optimal layouts. Among such techniques, Discrete Optimisation has a consistent record in Civil and Structural Engineering. In contrast, the Optimisation of Continua recently emerged as a critical asset for fostering the employment of Additive Manufacturing, as one can observe in several other industrial fields. With the purpose of filling the need for a systematic review both on the Topology Optimisation recent applications in structural steel design and on its emerging advances that can be brought from other industrial fields, this article critically analyses scientific publications from the year 2015 to 2020. Over six hundred documents, including Research, Review and Conference articles, added to Research Projects and Patents, attained from different sources were found significant after eligibility verifications and therefore, herein depicted. The discussion focused on Topology Optimisation recent approaches, methods, and fields of application and deepened the analysis of structural steel design and design for Additive Manufacturing. Significant findings can be found in summarising the state-of-the-art in profuse tables, identifying the recent developments and research trends, as well as discussing the path for disseminating Topology Optimisation in steel construction.

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“…Moreover, Zhang et al reported that the UNSM-induced work-hardening by plastic strain may also play a major role in increasing the hardness [31]. Moreover, in particular for AM materials, the expelled pores after peening technologies may be contributed to the increase in hardness [32]. Figure 4 shows XRD patterns of the as-SLM, UNSM-25C and UNSM-800C samples.…”

Section: Surface Integritymentioning

confidence: 99%

Tribology of Ti-6Al-4V Alloy Manufactured by Additive Manufacturing

Amanov¹

2021

Tribology in Materials and Manufacturing - Wear, Friction and Lubrication

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In this study, the influence of ultrasonic nanocrystal surface modification (UNSM), which was applied as a post-additive manufacturing (AM), in terms of surface, tensile and tribological properties of Ti-6Al-4V alloy by selective laser melting (SLM) was investigated. Ti-6Al-4V alloy was subjected to UNSM at room and high temperatures (RT and HT). It was found that the UNSM enhanced the strength and reduced the roughness of the as-SLM sample, where both increased with increasing UNSM temperature. The UNSM bore influence on tribological properties, where the friction coefficient of the as-SLM sample reduced by about 25.8% and 305% and the wear resistance enhanced by about 41% and 246% at RT and HT, respectively. These are essentially attributed to the enhanced strength, smoothed surface and expelled pores from the surface. Based on SEM images, the damage caused by abrasive wear was the most observed in the wear track of the as-SLM sample than was caused by the highest wear rate. The UNSM temperaturedependent wear mechanisms were comprehensively investigated and elaborated based on the obtained experimental data and observed microstructural images. Indeed, a further investigation is required to improve the characteristics of as-SLM Ti-6Al-4V alloy to the wrought level due to the replacement possibility.

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Improved fatigue strength of additively manufactured Ti6Al4V by surface post processing

Cited by 169 publications

References 23 publications

A review on the recent advances concerning the fatigue performance of titanium alloys for orthopedic applications

A review on the recent advances concerning the fatigue performance of titanium alloys for orthopedic applications

Topology Optimisation in Structural Steel Design for Additive Manufacturing

Tribology of Ti-6Al-4V Alloy Manufactured by Additive Manufacturing

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