Thickness dependency of mechanical properties for thin-walled titanium parts manufactured by Electron Beam Melting (EBM) ®

Ålgårdh, Joakim; Horn, Timothy; West, Harvey; Aman, Ronald; Snis, Anders; Engqvist, Håkan; Lausmaa, Jukka; Harrysson, Ola L. A.

doi:10.1016/j.addma.2016.06.009

Cited by 53 publications

(35 citation statements)

References 18 publications

(20 reference statements)

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“…Thin walled AM material with rough as-built surface has reduced static strength compared to bulk material [24]. This is behaviour can most likely be attributed to the surface morphology in which the rough as-built surface is a large part of the thin wall cross section and the load bearing area is thereby considerably reduced.…”

Section: Static Strengthmentioning

confidence: 93%

“…This is behaviour can most likely be attributed to the surface morphology in which the rough as-built surface is a large part of the thin wall cross section and the load bearing area is thereby considerably reduced. This reducing effect can be neglected for thicker wall thicknesses, above 4 mm, and for AM material with machined surfaces [24].…”

Section: Static Strengthmentioning

confidence: 99%

“…However, material behaviour for AM Ti6Al4V can still be very different compared to the behaviour of Ti6Al4V from conventional product forms. The different behaviour can both be attributed to differences in microstructure [12,13,21] but also due to effects of the rough as-built AM surface which affects both fatigue behaviour [12,[21][22][23] and static properties [21,22,24]. …”

Section: Titanium Ti6al4vmentioning

confidence: 99%

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Fatigue Performance of Additive Manufactured Ti6Al4V in Aerospace Applications

Kahlin¹

2017

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Additive Manufacturing (AM) for metals includes is a group of production methodst hat use a layer-by-layer approach to directly manufacture final parts. In recent years, the production rate and material quality of additive manufactured materials have improved rapidly which has gained increased interest from the industry to use AM not only for prototyping, but for serial production. AM offers a greater design freedom, compared to conventional production methods, which allows for parts with new innovative design. This is very attractive to the aerospace industry, in which parts could be designed to have reduced weight and improved performance contributing to reduced fuel consumption, increased payload and extended flight range. There are, however, challenges yet to solve before the potential of AM could be fully utilized in aerospace applications. One of the major challenges is how to deal with the poor fatigue behaviour of AM material with rough as-built surface. The aim of this thesis is to increase the knowledge of how AM can be used for high performance industrial parts by investigating the fatigue behaviour of the titanium alloy Ti6Al4V produced with different AM processes. Foremost, the intention is to improve the understanding of how rough as-built AM surfaces in combination with AM built geometrical notches affects the fatigue properties.This was done by performing constant amplitude fatigue testing to compare different combinations of AM material produced by Electron Beam Melting(EBM) and Laser Sintering (LS) with machined or rough as-built surfaces with or without geometrical notches and Hot Isostatic Pressing (HIP) treatment. Furthermore, the material response can be different between constant amplitude and variable amplitude fatigue loading due to effects of overloads and local plastic deformations. The results from constant amplitude testing were used to predict the fatigue life for variable amplitude loading by cumulative damage approach and these predictions were then verified by experimental variable amplitude testing. The constant amplitude fatigue strength of material with rough as-built surfaces was found to be 65-75 % lower, compared to conventional wrought bar, in which HIP treatments had neglectable influence on the fatigue strength. Furthermore, the fatigue life predictions with cumulative damage calculations showed good agreement with the experimental results which indicates that a cumulative damage approach can be used, at least for a tensile dominated load sequences, to predict the fatigue behaviour of additive manufactured Ti6Al4V

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Section: Static Strengthmentioning

confidence: 93%

Section: Static Strengthmentioning

confidence: 99%

Section: Titanium Ti6al4vmentioning

confidence: 99%

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Fatigue Performance of Additive Manufactured Ti6Al4V in Aerospace Applications

Kahlin¹

2017

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“…These parameters consist of (a) distance between the parts on the build plate, (b) height of the part from the build plate, (c) location of the parts on the build plate, and (d) angle of the parts on the build plate [10]- [12]. Microstructure and resulting properties of the EB-PBF manufactured parts have been observed to be affected by some of these position-related parameters [6,10,11,13]. Although each of the position-related parameters can have a significant effect on the thermal history of an EB-PBF built part, there is a lack of knowledge in the literature on the effect of these parameters on the microstructure and functional performance of the manufactured parts [11,14,15].…”

Section: Introductionmentioning

confidence: 99%

Effect of build location on microstructural characteristics and corrosion behavior of EB-PBF built Alloy 718

Karimi

Sadeghimeresht

Ålgårdh

et al. 2020

Int J Adv Manuf Technol

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Electron beam-powder bed fusion (EB-PBF), a high-temperature additive manufacturing (AM) technique, shows great promise in the production of high-quality metallic parts in different applications such as the aerospace industry. To achieve a higher build efficiency, it is ideal to build multiple parts together with as low spacing as possible between the respective parts. In the EB-PBF technique, there are many unknown variations in microstructural characteristics and functional performance that could be induced as a result of the location of the parts on the build plate, gaps between the parts and part geometry, etc. In the present study, the variations in the microstructure and corrosion performance as a function of the parts location on the build plate in the EB-PBF process were investigated. The microstructural features were correlated with the thermal history of the samples built in different locations on the build plate, including exterior (the outermost), middle (between the outermost and innermost), and interior (the innermost) regions. The cubic coupons located in the exterior regions showed increased level (~20 %) of defects (mainly in the form of shrinkage pores) and lower level (~30-35 %) of Nb-rich phase fraction due to their higher cooling rates compared to the interior and middle samples. Electrochemical investigations showed that the location indirectly had a substantial influence on the corrosion behavior, verified by a significant increase in polarization resistance (R p ) from the exterior (2.1 ± 0.3 kΩ.cm 2 ) to interior regions (39.2 ± 4.1 kΩ.cm 2 ).

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“…When the beam turns around in the perimeters, more heat is generated there. This results in a partial swelling at the perimeter due to the excessive heat generated there and consequently affects the dimension of the z-axis in objects A and B [124] (Figure 48). Mikron showed constant lower values compared to the CAD file.…”

Section: Linear Measurementsmentioning

confidence: 99%

Digital dentistry : studies on the trueness and precision of additive manufacturing and intraoral scanning

Braian¹

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Thickness dependency of mechanical properties for thin-walled titanium parts manufactured by Electron Beam Melting (EBM) ®

Cited by 53 publications

References 18 publications

Fatigue Performance of Additive Manufactured Ti6Al4V in Aerospace Applications

Fatigue Performance of Additive Manufactured Ti6Al4V in Aerospace Applications

Effect of build location on microstructural characteristics and corrosion behavior of EB-PBF built Alloy 718

Digital dentistry : studies on the trueness and precision of additive manufacturing and intraoral scanning

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