Effect of Hot Isostatic Pressure treatment on the Electron-Beam Melted Ti-6Al-4V specimens

Popov, V. V.; Katz‐Demyanetz, Alexander; Garkun, Andrey; Muller, Gary; Strokin, Evgeny; Rosenson, H.

doi:10.1016/j.promfg.2018.02.102

Cited by 47 publications

(31 citation statements)

References 8 publications

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“…Post-thermal and/or thermomechanical treatments are commonly applied to the as-built AM components to improve the strength–ductility trade-off. This can include supertransus or subtransus heat treatments 14 , 15 , as well as hot isostatic pressing 16 inducing formation of stable α and β via decomposition of metastable microstructures. Subtransus treatments have limited impact on the microstructure and columnar morphologies derived from epitaxial growth are usually maintained.…”

Section: Introductionmentioning

confidence: 99%

Peritectic titanium alloys for 3D printing

et al. 2018

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Metal-based additive manufacturing (AM) permits layer-by-layer fabrication of near net-shaped metallic components with complex geometries not achievable using the design constraints of traditional manufacturing. Production savings of titanium-based components by AM are estimated up to 50% owing to the current exorbitant loss of material during machining. Nowadays, most of the titanium alloys for AM are based on conventional compositions still tailored to conventional manufacturing not considering the directional thermal gradient that provokes epitaxial growth during AM. This results in severely textured microstructures associated with anisotropic structural properties usually remaining upon post-AM processing. The present investigations reveal a promising solidification and cooling path for α formation not yet exploited, in which α does not inherit the usual crystallographic orientation relationship with the parent β phase. The associated decrease in anisotropy, accompanied by the formation of equiaxed microstructures represents a step forward toward a next generation of titanium alloys for AM.

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Section: Introductionmentioning

confidence: 99%

Peritectic titanium alloys for 3D printing

et al. 2018

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“…In any case, manufactured parts produced by melting of a powder bed are characterized by lack of fusion defects generated during the production process and by entrapped gas porosity inside powder particles. In order to relieve stresses and to reduce any remaining porosity detrimental to mechanical properties it is worth to treat L-PBF or EB-PBF products by Hot Isostatic Pressing (HIP) [18,19]. Such successful porosity closure is related to self-diffusion occurred during the applied heat treatment under very high isostatic pressure [19].…”

Section: Introductionmentioning

confidence: 99%

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Aliprandi

Giudice

Guglielmino

et al. 2019

Metals

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Thanks to their excellent mechanical strength in combination with low density, high melting point, and good resistance to corrosion, titanium alloys are very useful in many industrial and biomedical fields. The new additive manufacturing methods, such as Electron Beam Powder Bed Fusion based on the deposition of metal powders layers progressively molten by electron beam scanning, can overcome many of the machining problems concerning the production of peculiar shapes made of Ti alloys. However, the processing route is strictly determinant for mechanical performance of products, especially in the case of Ti alloys. In the present work flat specimens made of Ti-6Al-4V alloy produced by Electron Beam Powder Bed Fusion (or Electron Beam Melting) have been built and post-processed with the purpose of obtaining good tensile and creep performance. Preliminarily, the process parameters were set according to literature evidence and machine producer recommendations, validated by the results of a thermal analysis, aimed at satisfying the best processing conditions to reduce defects, as unmelted regions, microstructure coarsening or porosity, that are detrimental to mechanical behavior. Subsequently, Hot Isostatic Pressing and surface smoothing were considered, respectively, in order to reduce any internal porosity and lower roughness. Microstructure of the investigated specimens was characterized by optical and scanning electron microscopy observations and by X-ray diffraction measurements. Results show enhanced tensile behavior after the hot pressing treatment that allows to relieve stresses and reduce defects detrimental to mechanical properties. The best ductility was obtained by the combined effects of machining and densification. Creep test results verify the beneficial effects of surface smoothing.

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“…But in most laser-based systems without additional preheating, where cooling of material behind the beam spot is happening very fast down to relatively low temperatures of the component, residual stress may present a serious problem. Thus post-processing (most commonly hot isostatic pressing) is performed [43]. Also, in all cases when component manufacturing time is significant, lower (first) and upper (last) material layers are having very different thermal history and thus may result in a different microstructure.…”

Section: Powder-bed Additive Manufacturingmentioning

confidence: 99%

“…Heat treatment, coatings and surface modifications are being applied to titanium structures, according to their specific use. The most used post-processing procedure for titanium parts is hot isostatic pressing (HIP), which decreases the residual porosity and improves material microstructure resulting in improved fatigue stability [43].…”

Section: Titanium Alloysmentioning

confidence: 99%

Powder-bed additive manufacturing for aerospace application: Techniques, metallic and metal/ceramic composite materials and trends

et al. 2019

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The current paper is devoted to classification of powder-bed additive manufacturing (PB-AM) techniques and description of specific features, advantages and limitation of different PB-AM techniques in aerospace applications. The common principle of “powder-bed” means that the used feedstock material is a powder, which forms “bed-like” platform of homogeneous layer that is fused according to cross-section of the manufactured object. After that, a new powder layer is distributed with the same thickness and the “printing” process continues. This approach is used in selective laser sintering/melting process, electron beam melting, and binder jetting printing. Additionally, relevant issues related to powder raw materials (metals, ceramics, multi-material composites, etc.) and their impact on the properties of as-manufactured components are discussed. Special attention is paid to discussion on additive manufacturing (AM) of aerospace critical parts made of Titanium alloys, Nickel-based superalloys, metal matrix composites (MMCs), ceramic matrix composites (CMCs) and high entropy alloys. Additional discussion is related to the quality control of the PB-AM materials, and to the prospects of new approaches in material development for PB-AM aiming at aerospace applications.

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Effect of Hot Isostatic Pressure treatment on the Electron-Beam Melted Ti-6Al-4V specimens

Cited by 47 publications

References 8 publications

Peritectic titanium alloys for 3D printing

Peritectic titanium alloys for 3D printing

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Powder-bed additive manufacturing for aerospace application: Techniques, metallic and metal/ceramic composite materials and trends

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