Fatigue of Additive Manufacturing Specimens: A Comparison with Casting Processes

Charkaluk, Éric; Chastand, Victor

doi:10.3390/icem18-05352

Cited by 9 publications

(7 citation statements)

References 10 publications

(25 reference statements)

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“…In Figure 13, the results from the present study are compared with the reported scatter bands for cast, cast plus hot isostatically pressed (HIP), and wrought/annealed processed Ti-6Al-4V [66]. Overall, the fatigue data obtained in this work is in the range of Ti-6Al-4V produced by casting and corroborates reasonably well with the properties reported in the open literature [15,57,59,[67][68][69], especially considering the broad scatter of the fatigue life data [70]. The current data also indicate a strong influence on fatigue life from both the surface finish and oxygen content, as evident by the IS Ti-6Al-4V material exhibiting the highest fatigue performance, with results that were in the range of parts that had been cast plus HIP.…”

Section: Fatigue Testingsupporting

confidence: 85%

Microstructure and Mechanical Properties of Ti-6Al-4V Additively Manufactured by Electron Beam Melting with 3D Part Nesting and Powder Reuse Influences

Wanjara

Bäckman

Sikan

et al. 2022

JMMP

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To better support the transition to more industrial uses of additive manufacturing, this study examined the use of an Arcam Q20+ industrial 3D printer for producing heavily nested Ti-6Al-4V parts with both in-specification (IS) and out of specification (OS) oxygen content in reused grade 5 powder chemistries. Both the OS and IS powder chemistries were evaluated to understand their impact on build integrity and on static and fatigue performance. The results from our evaluations showed that controlling the bed preheat temperature in the Q20+ to relatively low values (326–556 °C) was effective in limiting microstructural coarsening during the long build time and enabled adequate/balanced performance vis à vis the tensile strength and ductility. Overall, the tensile properties of the IS Ti-6Al-4V material in the as-built and machined states fully met the requirements of ASTM F2924-14. By contrast, the ductility was compromised at oxygen levels above 0.2 wt.% (OS) in Ti-6Al-4V produced by EBM. Removal of the surface layer by machining increased the consistency and performance of the IS and OS Ti-6Al-4V materials. The fatigue behaviour of the EBM Ti-6Al-4V material was in the range of properties produced by casting. Due to the strong influence of both the surface finish and oxygen content on the fatigue strength, the IS Ti-6Al-4V material exhibited the highest performance, with results that were in the range of parts that had been cast plus hot isostatically pressed.

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Section: Fatigue Testingsupporting

confidence: 85%

Microstructure and Mechanical Properties of Ti-6Al-4V Additively Manufactured by Electron Beam Melting with 3D Part Nesting and Powder Reuse Influences

Wanjara

Bäckman

Sikan

et al. 2022

JMMP

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“…An estimation of the starting amplitude based on the tensile strength was refrained from due to pronounced scattering. 25,26 The test series for estimating fatigue strength was accomplished based on six samples, thus meeting the minimum required number of samples. 16 With respect to the corresponding equation according to the IABG method, an average fatigue strength of about 191 MPa is established for the as-built condition.…”

Section: Resultsmentioning

confidence: 99%

Microstructural and Mechanical Properties of AISI 4140 Steel Processed by Electron Beam Powder Bed Fusion Analyzed Using Miniature Samples

Fischer¹,

Vollmer²,

Krooß³

et al. 2022

Progress in Additive Manufacturing 2020

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The present study reports on the identification of an adequate process window for electron beam powder bed fusion (E-PBF) of AISI 4140 steel. For characterization, only miniature samples were used. It is clearly revealed that, for comparison and evaluation of different conditions, the use of such small samples is absolutely sufficient, even under fatigue loading. The initial E-PBF as-built condition is compared with conventionally heat-treated conditions (i.e., normalized as well as quenched and tempered). Based on the results obtained, the advantages of E-PBF in comparison to other additive manufacturing routes, such as laser powder bed fusion (L-PBF), are discussed. In E-PBF, a very ductile material behavior results from the prevailing process conditions. Furthermore, an as-built condition almost free of residual stresses is established by E-PBF. Microstructural as well as fracture surface analyses were conducted and further supported by three-dimensional defect characterization applying X-ray computed tomography. It was found that the microstructural appearance of the as-built condition is affected most severely by the relatively sluggish cooling after the uppermost layer is finished. Thus, many issues related to L-PBF processing of carbon steels such as AISI 4140 do not prevail in E-PBF. The results obtained by mechanical testing clearly reveal that the remaining process-related volume defects can be compensated to a certain extent in the ductile as-built state. Consequently, the non-heat-treated, as-built condition is characterized by fatigue properties similar to those of post-treated AISI 4140. The latter, however, is characterized by superior strength under monotonic loading.

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“…9. 167 In addition, the standard range for polished wrought and casting specimens is provided. X – Y and Z are the manufacturing directions of the specimens.…”

Section: B-based Approaches For Modification Of Bioresponse and Impro...mentioning

confidence: 99%

A review onin vitro/in vivoresponse of additively manufactured Ti–6Al–4V alloy

et al. 2022

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Fatigue of Additive Manufacturing Specimens: A Comparison with Casting Processes

Cited by 9 publications

References 10 publications

Microstructure and Mechanical Properties of Ti-6Al-4V Additively Manufactured by Electron Beam Melting with 3D Part Nesting and Powder Reuse Influences

Microstructure and Mechanical Properties of Ti-6Al-4V Additively Manufactured by Electron Beam Melting with 3D Part Nesting and Powder Reuse Influences

Microstructural and Mechanical Properties of AISI 4140 Steel Processed by Electron Beam Powder Bed Fusion Analyzed Using Miniature Samples

A review onin vitro/in vivoresponse of additively manufactured Ti–6Al–4V alloy

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