Creep and high temperature fatigue performance of as build selective laser melted Ti-based 6Al-4V titanium alloy

Viespoli, Luigi Mario; Bressan, Stefano; Itoh, Takamoto; Hiyoshi, Noritake; Prashanth, Konda Gokuldoss; Berto, Filippo

doi:10.1016/j.engfailanal.2020.104477

Cited by 51 publications

(20 citation statements)

References 20 publications

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“…The lower fatigue strength performance can be attributed to the notch effect and stress concentrations caused by the rough surface defects (Nicoletto et al, 2020;du Plessis and Beretta, 2020). Surface roughness has also been shown to have a negative effect between the increasing degree of surface roughness and properties such as elongation at break (Ellis et al, 2015), creep (Viespoli et al, 2020) and bending (Frkán et al, 2017). Other commonly researched properties of LPBF materials include compressive strength (Bayati et al, 2020), tribological features (Mondragón-Rodríguez et al, 2020) tensile strength and elongation (Harada et al, 2020).…”

Section: Iced21mentioning

confidence: 99%

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

2021

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One often-cited benefit of using metal additive manufacturing (AM) is the possibility to design and produce complex geometries that suit the required function and performance of end-use parts. In this context, laser powder bed fusion (LPBF) is one suitable AM process. Due to accessibility issues and cost-reduction potentials, such ‘complex’ LPBF parts should utilise net-shape manufacturing with minimal use of post-process machining. The inherent surface roughness of LPBF could, however, impede part performance, especially from a structural perspective and in particular regarding fatigue. Engineers must therefore understand the influence of surface roughness on part performance and how to consider it during design. This paper presents a systematic literature review of research related to LPBF surface roughness. In general, research focuses on the relationship between surface roughness and LPBF build parameters, material properties, or post-processing. Research on design support on how to consider surface roughness during design for AM is however scarce. Future research on such supports is therefore important given the effects of surface roughness highlighted in other research fields.

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Section: Iced21mentioning

confidence: 99%

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

2021

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“…Several authors [68][69][70][71][72][73] studied the fatigue properties of the titanium alloy manufactured via metal powder bed fusion. Chastand et al [68] investigated the influence of different manufacturing processes, build orientation, surface roughness, and HIP treatment on the fatigue life of titanium samples.…”

Section: Heat Treatmentsmentioning

confidence: 99%

“…Moreover, when compared to the as-built specimens, the HIPed ones exhibited far better fatigue endurance ratios as the porosity increased. Similarly, Vispoli et al [72] investigated the surface roughness effect on the fatigue behaviour of Ti-6Al-4V samples produced via SLM. The authors reported that the fatigue resistance of the as-built specimens, when compared to the machined ones, evidenced a drastic reduction due to the elevated roughness.…”

Section: Heat Treatmentsmentioning

confidence: 99%

A Review of Heat Treatments on Improving the Quality and Residual Stresses of the Ti–6Al–4V Parts Produced by Additive Manufacturing

Teixeira

Silva

Ferreira

et al. 2020

Metals

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Additive manufacturing (AM) can be seen as a disruptive process that builds complex components layer upon layer. Two of its distinct technologies are Selective Laser Melting (SLM) and Electron Beam Melting (EBM), which are powder bed fusion processes that create metallic parts with the aid of a beam source. One of the most studied and manufactured superalloys in metal AM is the Ti–6Al–4V, which can be applied in the aerospace field due to its low density and high melting point, and in the biomedical area owing to its high corrosion resistance and excellent biocompatibility when in contact with tissues or bones of the human body. The research novelty of this work is the aggregation of all kinds of data from the last 20 years of investigation about Ti–6Al–4V parts manufactured via SLM and EBM, namely information related to residual stresses (RS), as well as the influence played by different heat treatments in reducing porosity and increasing mechanical properties. Throughout the report, it can be seen that the expected microstructure of the Ti–6Al–4V alloy is different in both manufacturing processes, mainly due to the distinct cooling rates. However, heat treatments can modify the microstructure, reduce RS, and increase the ductility, fatigue life, and hardness of the components. Furthermore, distinct post-treatments can induce compressive RS on the part’s surface, consequently enhancing the fatigue life.

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“…A large set of experimental results obtained by testing equiaxed [2][3][4][5][6][7], duplex [8,9] and Widmanstätten [2,[10][11][12][13] microstructures was thus reviewed in [1]. The analysis led to a constitutive model that was perfectly adequate in describing the creep data obtained by testing the alloy produced by SLM in the as-deposited state [14] and after annealing at 740 °C (the original data presented in [1]). The minimum creep rate (𝜀̇𝑚) dependence on applied stress (σ) and temperature (T) was well described by a unique constitutive equation, in the form…”

Section: Introductionmentioning

confidence: 99%

Effect of Post-Processing Heat Treatments on Short-Term Creep Response at 650 °C for a Ti-6Al-4V Alloy Produced by Additive Manufacturing

Paoletti

Cabibbo

Santecchia

et al. 2022

Metals

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Post-processing heat treatments of Ti-6Al-4V parts produced by additive manufacturing are essential for restoring the peculiar martensitic structure that originates from the extremely high cooling rates typical of this technology. In this study, the influence of a 1050 °C annealing on a Ti-6Al-4V alloy, produced by additive manufacturing, on the minimum creep rate dependence on applied stress and temperature, was investigated at 650 °C. Experimental data obtained after two different subcritical annealings were also considered for comparison purposes. The analysis of the experimental creep data demonstrated that the alloy annealed at the highest temperature exhibited lower creep rates. The improved creep response was attributed to the combined effect of the presence of extended α-β interfaces and of a small volume fraction of Ti3Al particles.

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Creep and high temperature fatigue performance of as build selective laser melted Ti-based 6Al-4V titanium alloy

Cited by 51 publications

References 20 publications

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

A Review of Heat Treatments on Improving the Quality and Residual Stresses of the Ti–6Al–4V Parts Produced by Additive Manufacturing

Effect of Post-Processing Heat Treatments on Short-Term Creep Response at 650 °C for a Ti-6Al-4V Alloy Produced by Additive Manufacturing

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