Effects of build orientation and sample geometry on the mechanical response of miniature CP-Ti Grade 2 strut samples manufactured by laser powder bed fusion

Pehlivan, Eren; Roudnická, Michaela; Džugan, Ján; Koukolíková, Martina; Králík, Vlastimil; Seifi, Mohsen; Lewandowski, John J.; Dalibor, Dalibor; Daniel, Matěj

doi:10.1016/j.addma.2020.101403

Cited by 18 publications

(13 citation statements)

References 20 publications

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“…The partitioning ratios of aluminum and vanadium are also increased so that more aluminum partitions to the α phases and more vanadium partitions to the β phase [24]. It was not possible to distinguish the prior-β grains in the thinner EBM-processed samples, as the grains were irregular, inclined and harder to distinguish (Figure 9a), although the prior-β columnar grains exhibited a more regular shape with regular orientation along the build direction with increasing sample thickness [17]. For the post-processed SLM samples published elsewhere [13], the opposite trend was observed for the prior-β grains and α-lamellae.…”

Section: Microstructure and Fractographymentioning

confidence: 99%

“…Several papers [13,[15][16][17][18] have focused on the benefits of using miniature specimens to assess the mechanical properties of AM products and it has been shown that small specimens can capture and mimic the local differences in deposited parts. Furthermore, small specimens could be manufactured along with products and serve as witness samples as part of a quality assessment process.…”

Section: Introductionmentioning

confidence: 99%

“…Figure17. Dependence of OYS and UTS values on specimen surface length/cross section ratio for SLM-processed flat specimens the for first ("1") and second ("2") batch of testing.…”

mentioning

confidence: 99%

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Build Size and Orientation Influence on Mechanical Properties of Powder Bed Fusion Deposited Titanium Parts

Mertová

Džugan

Roudnická

et al. 2020

Metals

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This paper explores the influence of sample thickness and build orientation on the microstructure and mechanical properties of electron beam melting (EBM) additive manufactured Ti-6Al-4V titanium alloy and compared to previously published work on SLM-processed material. In particular, the various mechanical properties (tensile yield strength, ultimate tensile strength) were investigated with attempts to correlate with various microstructural features, including lamellae thickness, porosity and the size of prior-beta grains. However, it is shown that the surface exerts a dominant effect on mechanical properties with as-deposited surfaces. These observations provide the possibility for the further improvement of processing/property relations with as-deposited surfaces.

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Section: Microstructure and Fractographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Build Size and Orientation Influence on Mechanical Properties of Powder Bed Fusion Deposited Titanium Parts

Mertová

Džugan

Roudnická

et al. 2020

Metals

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“…This surface roughness crust effect is largely responsible for much of the size-dependence observed in AM metals, as we and other researchers have explored previously. 14,43,44 There are differences in porosity levels and microstructure between these two sizes of tensile bars, but the surface crust appears to be the most likely dominant factor for the differences shown here. The thickness of the surface crust tends to vary from sample to sample, substantially increasing variability as cross-sectional area was reduced; however, no clear surface crust trends were observed with build plate or location.…”

Section: Resultsmentioning

confidence: 78%

High-Throughput Statistical Interrogation of Mechanical Properties with Build Plate Location and Powder Reuse in AlSi10Mg

Carroll

Exil

DeJong

et al. 2021

JOM

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Additive manufacturing (AM) allows agile, rapid manufacturing of geometrically complex components that would otherwise be impossible through traditional manufacturing methods. With this maturing manufacturing technology comes the need to adopt testing methods that are commensurate with the speed of additive manufacturing and take advantage of its geometric flexibility. High-throughput tensile testing (HTT) is a technique that allows a large number of tensile bars to be tested in a short amount of time. In the present study, HTT is used to evaluate AM AlSi10Mg produced using powder bed fusion with a Renishaw AM250 machine. Three parameters were varied in this study: (1) powder reuse history, (2) location on the build plate, and (3) size of the tensile specimen. For all parameter combinations, at least 22 specimens were tested; in several cases, over 40 were tested. This large dataset, consisting of over 500 tensile tests, permits Weibull statistical analysis and provides sufficient fidelity to isolate subtle trends that would have likely been missed in smaller, traditional datasets. The observed trends are rationalized in terms of the role of porosity and surface crust on mechanical response.

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“…Three-dimensional porous structures can be prepared by using titanium powder by selective laser melting (SLM) belonging to powder bed fusion (PBF) technology [ 18 , 19 , 20 , 21 , 22 , 23 ]. In this system, the deposition process is conducted under a protective atmosphere of inert gas.…”

Section: Introductionmentioning

confidence: 99%

Post-Processing Treatment Impact on Mechanical Properties of SLM Deposited Ti-6Al-4 V Porous Structure for Biomedical Application

et al. 2020

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Additive manufacturing technologies allow producing a regular three-dimensional mesh of interconnected struts that form an open-cell porous structure. Regular porous structures have been used in the orthopedic industry due to outstanding bone anchoring. The aim of the study was to determine how the postprocessing influences the mechanical properties of porous structures made of titanium alloy CL 41TI ELI. The effect of hot isostatic pressing (HIP) as a method of increasing microstructural integrity was investigated here. The influence of surface etching (SE) technique, which was applied to the porous structure for cleaning unmelted titanium powder particles on the surface of connectors from the inner surfaces of a porous structure, was examined in this study. Mechanical properties were investigated by means of compression tests. The results point out that HIP has a minor effect on the mechanical behavior of considered porous structures. The SE is an effective method to clean the surface of a porous structure, which is very important in the case of biomedical applications when loose powder can cause serious health problems. Another effect of the SE is also the strut thickness reduction. Reducing strut thickness of a porous structure with the surface etching decreases its stiffness to the same extent as predicted by the relative density theoretical model but did not result in structural damage.

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Effects of build orientation and sample geometry on the mechanical response of miniature CP-Ti Grade 2 strut samples manufactured by laser powder bed fusion

Cited by 18 publications

References 20 publications

Build Size and Orientation Influence on Mechanical Properties of Powder Bed Fusion Deposited Titanium Parts

Build Size and Orientation Influence on Mechanical Properties of Powder Bed Fusion Deposited Titanium Parts

High-Throughput Statistical Interrogation of Mechanical Properties with Build Plate Location and Powder Reuse in AlSi10Mg

Post-Processing Treatment Impact on Mechanical Properties of SLM Deposited Ti-6Al-4 V Porous Structure for Biomedical Application

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