Compressive fatigue properties of additive-manufactured Ti-6Al-4V cellular material with different porosities

Wu, Ming-Wei; Chen, Jhewn‐Kuang; Lin, Bo-Huan; Chiang, Po-Hsing; Tsai, Mo-Kai

doi:10.1016/j.msea.2020.139695

Cited by 38 publications

(16 citation statements)

References 36 publications

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“…Unfortunately, the DIC technique has rarely been used in the field of AM cellular alloys to date. [8,[32][33][34][35] In this study, two-dimensional DIC software (Vic-2D, Correlated Solutions, Inc.) was used to analyze the successive pictures obtained from the in-situ test and to calculate the strains in each of the areas of the specimens. Combining in-situ observation and DIC technique allows clear identification of the progress of deformation and fracture during mechanical tests.…”

Section: Methodsmentioning

confidence: 99%

“…[4][5][6][7][8][9] Among the AM metallic materials, Ti-based alloys, particularly Ti-6Al-4V, are promising materials for various applications and have been widely produced and studied. [8][9][10][11][12][13][14][15][16][17][18] The mechanical properties and fracture behaviors of AM cellular Ti-6Al-4V are dominantly controlled by the type of lattice and the porosity. Several unit cell designs, including cubic, diamond, rhombic dodecahedron, truncated cuboctahedron, and G7, have been extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

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Compression Property, Deformation Behavior, and Fracture Mechanism of Additive-Manufactured Ti-6Al-4V Cellular Solid with a New Cuboctahedron Structure

Chen

Chiang

et al. 2020

Metall Mater Trans A

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Laser powder bed fusion is a major additive manufacturing process for manufacturing cellular metallic materials. The main objective of this study was to clarify the influences of microstructure on the compressive deformation behavior and fracture mechanism of selective laser melted (SLM) cellular Ti-6Al-4V alloy with a new cuboctahedron structure using in-situ observation in combination with the digital image correlation technique. The results indicated that the compressive stress-strain curve of the SLM specimen was serrated in the plateau regime due to the brittle struts with a¢-martensite. Nevertheless, hot isostatic pressing (HIP) at 1000°C/ 150 MPa transformed the microstructure from brittle a¢-martensite to ductile a + b dual phases. In the HIP specimen, the struts plastically collapsed layer-by-layer with increasing compressive strain and were then extruded into the surrounding pores, resulting in a smooth stress-strain curve. Furthermore, the HIP treatment also improved the energy absorption at 50 pct strain from 68.1 to 77.4 MJ/m 3 and maintained the uniformity in the width of the cellular material. These effects are advantageous to energy absorbing applications and alleviating the risk of biomedical implants.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compression Property, Deformation Behavior, and Fracture Mechanism of Additive-Manufactured Ti-6Al-4V Cellular Solid with a New Cuboctahedron Structure

Chen

Chiang

et al. 2020

Metall Mater Trans A

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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%

“…To conclude, the authors also reported that the effect of the build direction highly depends on the presence of unmelted zones. In a similar study, Wu et al [71] investigated the porosity and HIP treatment effect on the fatigue endurance ratio of SLMed titanium samples. For that, the researchers purposely manufactured cellular structures with three different porosities (33 vol%, 50 vol%, and 84 vol%) and then subjected some of them to an HIP treatment at 1000 • C and a pressure of 150 MPa for 1 h. After studying the microstructure, the authors reported that the heat treatment promoted the transformation of the martensitic microstructure into a lamellar α + β phase.…”

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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“…Therefore, understanding the fatigue behavior of these materials has gained strategic importance in the recent years. Various studies have indicated that the compression–compression fatigue properties are dependent on various parameters such as cell topology, stress ratio (R‐ratio), heat treatment, and the presence manufacturing defects from AM process 20,29,35–42 . Zhao et al 36 and Yavari et al 31 have investigated the effect of cell topology and porosity on the compression–compression fatigue behavior.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐static compression and compression–compression fatigue behavior of regular and irregular cellular biomaterials

Raghavendra

Molinari

Cao

et al. 2021

Fatigue Fract Eng Mat Struct

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The main aim of the current study is to evaluate the compressive quasi‐static and fatigue properties of titanium alloy (Ti6Al4V) cellular materials, with different topologies, manufactured via laser powder bed fusion (LPBF) process. The topologies herein considered are lattice‐based regular and irregular configurations of cubic, star, and cross‐shaped unit cell along with trabecular‐based topology. The results have indicated that the effective stiffness of all configurations are in the range of 0.3–20 GPa, which is desirable for implant applications. The morphological irregularities in the structures induce bending‐dominated behavior affecting more the topologies with vertical struts. The S–N curves normalized with respect to the yield stress indicate that the behavior of star regular structures is between purely stretching‐dominated cubic and purely bending‐dominated cross‐based structures. Trabecular structures have shown desirable quasi‐static and fatigue properties despite the random distribution of struts.

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Compressive fatigue properties of additive-manufactured Ti-6Al-4V cellular material with different porosities

Cited by 38 publications

References 36 publications

Compression Property, Deformation Behavior, and Fracture Mechanism of Additive-Manufactured Ti-6Al-4V Cellular Solid with a New Cuboctahedron Structure

Compression Property, Deformation Behavior, and Fracture Mechanism of Additive-Manufactured Ti-6Al-4V Cellular Solid with a New Cuboctahedron Structure

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

Quasi‐static compression and compression–compression fatigue behavior of regular and irregular cellular biomaterials

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