Chemical Milling of Cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo Alloys in Hydrofluoric-Nitric Acid Solutions

Sefer, Birhan; Dobryden, Illia; Almqvist, Nils; Pederson, Robert; Antti, Marta‐Lena

doi:10.5006/2277

Cited by 26 publications

(14 citation statements)

References 31 publications

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“…As for polycrystalline copper in our sample, the increased density of crystal defects leads to a decreased in WF of Cu ( W Cu ); thus, it is inaccurate to compare its WF with those of single crystal copper mentioned in other refs, 32,33 and this result also increases the feasibility of the copper surface to lose an electron and be anodic. 26,34 WF can be related to V CPD according to the following equation: 34 V CPD = V Cu/G − V Cu = 1/ e ( W Cu − W Cu/G ) …”

Section: Resultsmentioning

confidence: 99%

Different graphene layers to enhance or prevent corrosion of polycrystalline copper

Shen

et al. 2018

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Different graphene layers to enhance or prevent corrosion of polycrystalline copper

Shen

et al. 2018

RSC Adv.

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“…The 2 × 06 specimen was immersed into the solution of the same composition 12 times for 3 min. It is known that the intensity of the etching decreases with time due to the formation of stable and soluble titanium hexafluoro complexes [ 27 ]. Therefore, in the case of the 2 × 06 specimen, the chemical solution was renewed after 12 and 24 min of etching.…”

Section: Methodsmentioning

confidence: 99%

“…The procedures presented in this work allow obtaining information about the production and post-processing of AM structures. This information can be integrated into the optimization of the manufacturing process, and into the numerical simulations of the properties for the resulting structures [ 27 ]. The detailed investigation of the correlation between morphological characteristics, materials properties, and structure performance is not in the scope of this work and will be discussed in the follow-up publications.…”

Section: Introductionmentioning

confidence: 99%

X-ray Computed Tomography Procedures to Quantitatively Characterize the Morphological Features of Triply Periodic Minimal Surface Structures

Evsevleev

Mishurova

Khrapov³

et al. 2021

Materials

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Additively manufactured (AM) metallic sheet-based Triply Periodic Minimal Surface Structures (TPMSS) meet several requirements in both bio-medical and engineering fields: Tunable mechanical properties, low sensitivity to manufacturing defects, mechanical stability, and high energy absorption. However, they also present some challenges related to quality control, which can prevent their successful application. In fact, the optimization of the AM process is impossible without considering structural characteristics as manufacturing accuracy, internal defects, as well as surface topography and roughness. In this study, the quantitative non-destructive analysis of TPMSS manufactured from Ti-6Al-4V alloy by electron beam melting was performed by means of X-ray computed tomography (XCT). Several advanced image analysis workflows are presented to evaluate the effect of build orientation on wall thicknesses distribution, wall degradation, and surface roughness reduction due to the chemical etching of TPMSS. It is shown that the manufacturing accuracy differs for the structural elements printed parallel and orthogonal to the manufactured layers. Different strategies for chemical etching show different powder removal capabilities and both lead to the loss of material and hence the gradient of the wall thickness. This affects the mechanical performance under compression by reduction of the yield stress. The positive effect of the chemical etching is the reduction of the surface roughness, which can potentially improve the fatigue properties of the components. Finally, XCT was used to correlate the amount of retained powder with the pore size of the functionally graded TPMSS, which can further improve the manufacturing process.

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“…The alpha case was caused by the too high laser power or oxygen exposed. It was the oxygenenriched surface alloy or weak point layers (49,50). This layers had a detrimental effected in microcracks caused brittle fracture (49) in this study.…”

Section: Chapter V Discussion and Conclusionmentioning

confidence: 60%

“…It was the oxygenenriched surface alloy or weak point layers (49,50). This layers had a detrimental effected in microcracks caused brittle fracture (49) in this study. Moreovers, this group also found the least α' martensitic phase because the high laser power leaded the less gap of cool down temperature.…”

Section: Chapter V Discussion and Conclusionmentioning

confidence: 60%

The effect of laser power on mechanical and physical properties of TI-6Al-4V ELI fabricated by selective laser melting

Termrungruanglert¹

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This study aimed to examine the differences in mechanical and physical properties of Ti-6Al-4V extra low interstitial (ELI) fabricated by selective laser melting (SLM) between different laser power. The Ti-6Al-4V ELI alloy samples were printed in dumbbell shape by SLM machine (Trumpf/TruPrint 1000, Germany) with 3 laser powers (75, 100 and 125 W), 8 samples for each group. And the other parameters (spot size 30 µm, scanning speed 600 mm/s, layer thickness 30 µm) were kept constantly. All samples were performed under tensile test with universal testing machine. Moreover, The microhardness test was performed. All data were statistically analyzed with one way ANOVA and Tukey’s post-hoc tests (α=0.05). The microstructure was analyzed by optical microscope and mode of failure was observed by SEM. It was found that the group laser power 100 W was the highest mean tensile strength (1189 .67 MPa) and highest mean microhardness (394.94 VHN). The tensile strength in group laser power 75 and 125 W were 424.62 and 329.88 MPa, respectively. And microhardness value in group laser power 75 and 125 W were 368.3 and 369.62 VHN, respectively. Mode of failure after tensile testing in group of laser power 75 and 100 W showed in both ductile and brittle fracture. And the group of laser power 125 W was predominantly brittle fracture. In conclusion the difference in laser power effected the mechanical and physical properties. The laser power 100 W showed the highest mean tensile strength and microhardness significantly compared to the other 2 groups (α=0.05). And this group was found the α’ martensitic phase microstructure.

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Chemical Milling of Cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo Alloys in Hydrofluoric-Nitric Acid Solutions

Cited by 26 publications

References 31 publications

Different graphene layers to enhance or prevent corrosion of polycrystalline copper

Different graphene layers to enhance or prevent corrosion of polycrystalline copper

X-ray Computed Tomography Procedures to Quantitatively Characterize the Morphological Features of Triply Periodic Minimal Surface Structures

The effect of laser power on mechanical and physical properties of TI-6Al-4V ELI fabricated by selective laser melting

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