A fractographic study exploring the relationship between the low cycle fatigue and metallurgical properties of laser metal wire deposited Ti–6Al–4V

Åkerfeldt, Pia; Pederson, Robert; Antti, Marta‐Lena

doi:10.1016/j.ijfatigue.2016.02.011

Cited by 48 publications

(37 citation statements)

References 17 publications

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“…In addition, areas with wide colony alpha are frequently observed next to the prior beta grain boundary. Regarding possible influence of specimen location (in the built wall) on microstructure for AM:ed material, no variation has been observed in this and previous studies on the same walls [9,10]. …”

Section: Microstructural Characterizationcontrasting

confidence: 61%

“…The material characterized in the current study was manufactured using laser metal wire deposition (LMwD) and comes from the same walls as in [9,10]. In the LMwD process a robotized fiber laser cell melts a metal wire layer by layer forming the wanted shape, which in this case was so called "walls".…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, a large crack and a lack of fusion (LoF) defect were observed in crack profile CP2A and CP2B, respectively; see squares just below the surfaces in Figure 11. LoF defects could be detrimental to the mechanical properties [9,[23][24][25][26] and stems from the manufacturing process itself and is related to incomplete melting. The formation and characteristics of LoF defects are discussed in detail elsewhere [9].…”

Section: Figure 9 the Schmid Factor Intensity Maps For Crack Profilementioning

confidence: 99%

“…As for many other AM processes, the LMwD:ed Ti-6Al-4V exhibits anisotropic mechanical properties that vary depending on the specimen orientation within the built material [5,6]. In previous work, the tensile [6,10] and the low cycle fatigue [9] properties have been evaluated with respect to two specimen orientations. This anisotropy could be related to several parameters such as grain boundary alpha [7,8] and prevalence of defects [9].…”

Section: Introductionmentioning

confidence: 99%

“…In previous work, the tensile [6,10] and the low cycle fatigue [9] properties have been evaluated with respect to two specimen orientations. This anisotropy could be related to several parameters such as grain boundary alpha [7,8] and prevalence of defects [9]. Moreover, the building process renders large columnar prior beta grains because of a preferential dendritic growth during solidification in the beta phase, thus from a macroscopic perspective the prior beta grains could also be related to the anisotropic properties [10].…”

Section: Introductionmentioning

confidence: 99%

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Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Åkerfeldt

Colliander

Pederson

et al. 2018

Materials Characterization

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By additive manufacturing (AM) there is a feasibility of producing near net shape components in basically one step from 3D CAD model to final product. The interest for AM is high and during the past decade a lot of research has been carried out in order to understand the influence from process parameters on the microstructure and furthermore on the mechanical properties. In the present study laser metal wire deposition of Ti-6Al-4V has been studied in detail with regard to its fatigue crack propagation characteristics. Two specimen orientations, parallel and perpendicular to the deposition direction, have been evaluated at room temperature and at 250°C. No difference in the fatigue crack growth rate could be confirmed for the two specimen orientations. However, in the fractographic study it was observed that the tortuosity varied between certain regions on the fracture surface. The local crack path characteristic could be related to the alpha colony size and/or the crystallographic orientation. Moreover, large areas exhibiting similar crystallographic orientation were observed along the prior beta grain boundaries, which were attributed to the wide alpha colonies frequently observed along the prior beta grain boundaries.

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Section: Microstructural Characterizationcontrasting

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Section: Figure 9 the Schmid Factor Intensity Maps For Crack Profilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Åkerfeldt

Colliander

Pederson

et al. 2018

Materials Characterization

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Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Liu,

Yu,

Guo

et al. 2023

Advanced Materials

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Additive manufacturing (AM), which is a process of building objects in a layer‐upon‐layer fashion from designed models, has received unprecedented attention from research and industry because it offers outstanding merits of flexibility, customization, reduced buy‐to‐fly ratio, and cost‐effectiveness. However, the fatigue performance of safety‐critical industrial components fabricated by AM is still far below that obtained from conventional methods. This review discusses the microstructural heterogeneities, randomly dispersed defects, poor surface quality, and complex residual stress generated during the AM process that can negatively impact the fatigue performance of as‐printed parts. The difference in microstructural origin of fatigue failure between conventionally manufactured and printed metals is reviewed with particular attention to the effects of the trans‐scale microstructures on AM fatigue failure mechanisms. Various methods for mitigating the fatigue issue, including pre‐process, inter‐process and post‐process treatments, are illustrated. Empirical, semi‐empirical and microstructure‐sensitive models are presented to predict fatigue strength and lifetime. Summary and outlooks for future development of the fatigue performance of AM materials are provided.This article is protected by copyright. All rights reserved

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Selective Laser Melted Ti-6Al-4V Alloy after Post-Heat Treatments: Microstructure, Mechanical Properties and Fatigue Behavior

Wang,

Yan,

et al. 2024

J. of Materi Eng and Perform

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A fractographic study exploring the relationship between the low cycle fatigue and metallurgical properties of laser metal wire deposited Ti–6Al–4V

Cited by 48 publications

References 17 publications

Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Selective Laser Melted Ti-6Al-4V Alloy after Post-Heat Treatments: Microstructure, Mechanical Properties and Fatigue Behavior

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