Critical assessment of the fatigue performance of additively manufactured Ti–6Al–4V and perspective for future research

Li, P.; Warner, D.H.; Fatemi, Ali; Phan, Nam

doi:10.1016/j.ijfatigue.2015.12.003

Cited by 434 publications

(182 citation statements)

References 53 publications

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“…The analysis, which complements recent reviews [20], will show that the material properties in the presence of defects are quite similar for both additive and traditionally manufactured parts. This will allow us to discuss the prospective adoption of defect-tolerant design for the evaluation of the fitness for purpose of AM components.…”

Section: Introductionsupporting

confidence: 56%

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

Beretta

Romano

2017

International Journal of Fatigue

441

219

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Section: Introductionsupporting

confidence: 56%

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

Beretta

Romano

2017

International Journal of Fatigue

441

219

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“…Fracture-critical properties are affected by a variety of factors and two of the dominant factors are defect density and microstructure variation. Some properties (e.g., HCF, toughness) are very sensitive to defects as these provide potent fracture nucleation sites 12,60 as well as preferred regions for crack growth while other dominant factors include microstructural features at a range of size and length scales depending on the property of interest. 61 In the example shown in Fig.…”

Section: Non-destructive Inspection/ Evaluation (Lct) Of Defect Distrmentioning

confidence: 99%

Overview of Materials Qualification Needs for Metal Additive Manufacturing

Seifi

Salem

Beuth

et al. 2016

JOM

466

176

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This overview highlights some of the key aspects regarding materials qualification needs across the additive manufacturing (AM) spectrum. AM technology has experienced considerable publicity and growth in the past few years with many successful insertions for non-mission-critical applications. However, to meet the full potential that AM has to offer, especially for flightcritical components (e.g., rotating parts, fracture-critical parts, etc.), qualification and certification efforts are necessary. While development of qualification standards will address some of these needs, this overview outlines some of the other key areas that will need to be considered in the qualification path, including various process-, microstructure-, and fracture-modeling activities in addition to integrating these with lifing activities targeting specific components. Ongoing work in the Advanced Manufacturing and Mechanical Reliability Center at Case Western Reserve University is focusing on fracture and fatigue testing to rapidly assess critical mechanical properties of some titanium alloys before and after post-processing, in addition to conducting nondestructive testing/evaluation using micro-computerized tomography at General Electric. Process mapping studies are being conducted at Carnegie Mellon University while large area microstructure characterization and informatics (EBSD and BSE) analyses are being conducted at Materials Resources LLC to enable future integration of these efforts via an Integrated Computational Materials Engineering approach to AM. Possible future pathways for materials qualification are provided.

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“…In a recent critical review by Li et al [59], the HCF performance of various SLM coupons was evaluated. Due to the varying stress ratios (R) between tests conducted by different researchers, to provide a means of comparing results, the fatigue data can be normalised using the method applied by Li et al [59]. This method uses the effective maximum applied stress (σ e f f ), representing the effective maximum applied load at a stress ratio R = −1.0.…”

Section: Axial Fatigue Loadingmentioning

confidence: 99%

“…σ e f f is given by Equation (1), where σ max is the actual maximum applied stress for an applied stress ratio (R). The value of the exponent is a material constant which was determined by Li et al [59] using Ti-6Al-4V fatigue data obtained from stress ratios between −0.5, and 0.5. Using the effective maximum applied stress, the HCF performance could be compared independent of the stress ratio.…”

Section: Axial Fatigue Loadingmentioning

confidence: 99%

A Review of the As-Built SLM Ti-6Al-4V Mechanical Properties towards Achieving Fatigue Resistant Designs

Agius

Kourousis

Wallbrink

2018

Metals

156

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Ti-6Al-4V has been widely used in both the biomedical and aerospace industry, due to its high strength, corrosion resistance, high fracture toughness and light weight. Additive manufacturing (AM) is an attractive method of Ti-6Al-4V parts' fabrication, as it provides a low waste alternative for complex geometries. With continued progress being made in SLM technology, the influence of build layers, grain boundaries and defects can be combined to improve further the design process and allow the fabrication of components with improved static and fatigue strength in critical loading directions. To initiate this possibility, the mechanical properties, including monotonic, low and high cycle fatigue and fracture mechanical behaviour, of machined as-built SLM Ti-6Al-4V, have been critically reviewed in order to inform the research community. The corresponding crystallographic phases, defects and layer orientations have been analysed to determine the influence of these features on the mechanical behaviour. This review paper intends to enhance our understanding of how these features can be manipulated and utilised to improve the fatigue resistance of components fabricated from Ti-6Al-4V using the SLM technology.

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Critical assessment of the fatigue performance of additively manufactured Ti–6Al–4V and perspective for future research

Cited by 434 publications

References 53 publications

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

Overview of Materials Qualification Needs for Metal Additive Manufacturing

A Review of the As-Built SLM Ti-6Al-4V Mechanical Properties towards Achieving Fatigue Resistant Designs

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