Microstructure and Compressive Behavior of Ti-6Al-4V Alloy Built by Electron Beam Free-Form Fabrication

Клименов, В. А.; Fedorov, V. V.; Slobodyan, Mikhail; Pushilina, Natalia; Strelkova, Irina; Клопотов, А. А.; Batranin, A. V.

doi:10.1007/s11665-020-05223-9

Cited by 10 publications

(11 citation statements)

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“…This work investigates a LAM condition outperforming this property trade-off due to a dominance of mechanical twinning over slip during deformation. Values of ultimate strength and deformation at break obtained during uniaxial compression of Ti-6Al-4V produced by the following laser-based additive manufacturing methodologies: laser powder bed fusion (LPBF), direct energy deposition (DED), and electron beam melting (EBM) [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] -shown in green, blue and red, respectively. The condition studied in this work is surrounded by a bold line.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1 shows a literature review of the ultimate stress and deformation at break obtained during uniaxial compression of Ti-6Al-4V produced by the LAM methodologies LPBF, DED, and EBM. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] The values provided result from compression testing and a tension-compression asymmetry should be expected. Though this data allows comparing the Adv.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1 shows a literature review of the ultimate stress and deformation at break obtained during uniaxial compression of Ti–6Al–4V produced by the LAM methodologies LPBF, DED, and EBM. [ 23–37 ] The values provided result from compression testing and a tension‐compression asymmetry should be expected. Though this data allows comparing the strength–ductility trade‐off between conditions, it is important to remark that industrial applications of Ti–6Al–4V (e.g., aerospace) require considering further performance relevant under service conditions including high and low cycle fatigue properties.…”

Section: Resultsmentioning

confidence: 99%

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Interface‐Mediated Twinning‐Induced Plasticity in a Fine Hexagonal Microstructure Generated by Additive Manufacturing

et al. 2021

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The grain size is a determinant microstructural feature to enable the activation of deformation twinning in hexagonal close‐packed (hcp) metals. Although deformation twinning is one of the most effective mechanisms for improving the strength–ductility trade‐off of structural alloys, its activation is reduced with decreasing grain size. This work reports the discovery of the activation of deformation twinning in a fine‐grained hcp microstructure by introducing ductile body‐centered cubic (bcc) nano‐layer interfaces. The fast solidification and cooling conditions of laser‐based additive manufacturing are exploited to obtain a fine microstructure that, coupled with an intensified intrinsic heat treatment, permits to generate the bcc nano‐layers. In situ high‐energy synchrotron X‐ray diffraction allows tracking the activation and evolution of mechanical twinning in real‐time. The findings obtained show the potential of ductile nano‐layering for the novel design of hcp damage tolerant materials with improved life spans.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Interface‐Mediated Twinning‐Induced Plasticity in a Fine Hexagonal Microstructure Generated by Additive Manufacturing

et al. 2021

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“…Следует отметить, что в последнее время наряду с селективными методами сплавления материалов в аддитивных технологиях всё чаще используют методы послойного сплавления при прямом осаждении материала в зоне высокоэнергетического лазерного или электронного луча. Нередко используется подача наплавляемого материала в виде проволоки или стержня [7][8][9][10][11][12][13]. В качестве высокоэнергетических источников тепла используются в таком случае электронно-лучевые или дуговые источники [7,[10][11][12][13].…”

Section: ведениеunclassified

“…Нередко используется подача наплавляемого материала в виде проволоки или стержня [7][8][9][10][11][12][13]. В качестве высокоэнергетических источников тепла используются в таком случае электронно-лучевые или дуговые источники [7,[10][11][12][13]. Эти источники позволяют осуществлять процесс 3D-печати с высокой производительно-стью и дают низкую пористость напечатанных изделий.…”

Section: ведениеunclassified

Structural and mechanical properties of stainless steel formed under conditions of layer-by-layer fusion of a wire by an electron beam

Fedorov¹,

Рыгин²,

Клименов³

et al. 2021

Metal Working and Material Science

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Introduction. As of today, additive technologies are among the most promising methods to manufacture various parts. They allow producing parts of complex shapes and provide their quality structure. The quality of the structure formed depends on numerous parameters: equipment type, its operation mode, materials, shielding medium, etc. Large international companies producing 3D-printers provide technological guidelines for working on it. Such guidelines include the information on the manufacturers of raw materials (printing powders), products their equipment can work with and the operation modes that should be used with such powders. These parameters should be investigated to use it on the domestic equipment developed within the framework of research programs and import substitution programs. The researchers and developers of 3D-printing equipment frequently run into a problem of using currently available raw materials for obtaining parts possessing minimal porosity, uniform structure and mechanical properties similar to that of at least cast blanks. One of the widely used materials for 3D-printing is stainless steel. It has high corrosion resistance, which reduces the requirements to the medium in which 3D printing is carried out. Manufactured stainless steel products have a good combination of strength and plastic characteristics. The aim of the study is to obtain stainless steel specimens possessing minimal number of micro- and macro-defects and uniform structure by the method of wire arc additive manufacturing using an electron-beam setup developed at Tomsk Polytechnic University. The methods to study the AISI 308LSi stainless steel 3D-printed specimens are as follows: XRD analysis, tomography, chemical analysis, metallographic analysis, microhardness testing. Results and discussion. It is established that the AISI 308LSi stainless steel specimens manufactured using the electron-beam 3D-printing setup contain no macro-defects in the bulk of the specimens. There are small microdefects represented by residual gas pores with the dimensions of no more than 5.2 μm. The microstructure of the specimens is formed close to that of coarse-grained cast austenite steels and consists of columnar grains of the γ-Fe austenite matrix and high-temperature ferrite. The interfaces between the wire layers are not pronounced; however, there are small differences in phase composition. Based on the analysis of the results obtained, it is established that the use of electron-beam 3D-printing for the manufacture of parts from AISI 308LSi steel gives a structure similar to cast austenitic steels. Macro-defects do not appear, and the number of gas pores is small.

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Modeling the Tensile Behavior of Specimens Manufactured by the Selective Laser Melting Method Using Continuum Damage Mechanics Theory

Rokhgireh

Kästner

Nayebi

2021

J. of Materi Eng and Perform

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Selective laser melting (SLM) has been developed in recent decades. It is capable of manufacturing components with complex geometries. However, there is no reliable model to predict the failure of parts made by this technique. In this study, the continuum damage model (CDM) of Lemaitre and the Gurson-Tavergaard-Needleman (GTN) model are employed to simulate the tensile stress-strain behavior of SLM manufactured specimens and to study the specimen size effect. The numerical results are compared with experimental results of tensile tests of SLM manufactured specimens. It is shown that the two models appropriately simulate the tensile tests in the hardening part. However, when softening occurs, the modified CDM can better predict failure and size effect. It is also observed that the GTN model needs modifications of the parameters to be able to simulate the size dependency of the mechanical properties of the SLM manufactured parts, which is attributed to different initial values of porosity.

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Microstructure and Compressive Behavior of Ti-6Al-4V Alloy Built by Electron Beam Free-Form Fabrication

Cited by 10 publications

References 74 publications

Interface‐Mediated Twinning‐Induced Plasticity in a Fine Hexagonal Microstructure Generated by Additive Manufacturing

Interface‐Mediated Twinning‐Induced Plasticity in a Fine Hexagonal Microstructure Generated by Additive Manufacturing

Structural and mechanical properties of stainless steel formed under conditions of layer-by-layer fusion of a wire by an electron beam

Modeling the Tensile Behavior of Specimens Manufactured by the Selective Laser Melting Method Using Continuum Damage Mechanics Theory

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