The Martensitic Transformation and Mechanical Properties of Ti6Al4V Prepared via Selective Laser Melting

He, Junjie; Li, Duosheng; Jiang, Wu-Gui; Ke, Liming; Qin, Guohua; Yin, Yansheng; Qin, Qing‐Hua; Qiu, Dachuang

doi:10.3390/ma12020321

Cited by 75 publications

(52 citation statements)

References 37 publications

(52 reference statements)

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“…SLM parts were manufactured using an SLM 125 HL machine (SLM Solutions, Lubeck, Germany) under a high-purity Ar atmosphere. The machine equipped with a 400 W Yb: YAG fiber laser with a spot size of 80 µ m. The samples were manufactured with a set of SLM processing parameters: laser power 275 W, scanning Corrosion behavior and mechanical characteristics of the Ti-6Al-4V alloy by SLM-produced in different orientations were studied [23][24][25][26]. However, many experiments were focused on corrosion behavior of Ti-6Al-4V alloy in biomedical applications [27][28][29][30], its role in marine environments was rarely studied.…”

Section: Sample and Solution Preparationsmentioning

confidence: 99%

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Effect of Build Orientation on the Corrosion Behavior and Mechanical Properties of Selective Laser Melted Ti-6Al-4V

Sui¹,

Li²,

Wang³

et al. 2019

Metals

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Ti-6Al-4V alloys with different build orientations have been fabricated by selective laser melting (SLM). The corrosion behavior and mechanical properties have been studied. Investigation of microstructures were characterized by optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. Electrochemical results show that the vertical sample and horizontal sample possess excellent corrosion resistance in the cross section and longitudinal section respectively, which can be attributed to the presence of less acicular α′ martensite and more β phase. Mechanical properties of all samples were determined by compression testing and hardness measurements. The compression strength (σc) and plastic deformation (εp) of the horizontal sample were higher than those of the vertical sample and the sample with building direction of 45°, because the molten pool boundaries (MPBs) play a significant role in the microscopic slipping at the loading SLM parts. In addition, the sample with building orientation of 45° achieved highest hardness. Therefore, distinct anisotropy due to different build orientations.

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Section: Sample and Solution Preparationsmentioning

confidence: 99%

“…In Ref. [26] all peaks of as-built samples were indexed as the α/α phase, while the β phase was not detected. The cross section and longitudinal section of the samples consist of the equal phases, while, several value peaks of the main phases display different corresponding intensities.…”

Section: Microstructural Analysismentioning

confidence: 99%

Effect of Build Orientation on the Corrosion Behavior and Mechanical Properties of Selective Laser Melted Ti-6Al-4V

Sui¹,

Li²,

Wang³

et al. 2019

Metals

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“…The α"-Ti martensitic phase has an orthorhombic crystallographic structure and very different lattice parameters when comparing with parent β-Ti phase [17][18][19]. When high ductility is envisaged, the applied thermomechanical processing assumes a final ageing treatment, aimed to partially/totally revert the α -Ti/α"-Ti phases into the parent α-Ti/β-Ti phases [16] and thereby, the exhibited mechanical behaviour can be adjusted as needed [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties Evolution during Solution and Ageing Treatment for a Hot Deformed, above β-transus, Ti-6246 Alloy

Alluaibi

Cojocaru

Rusea³

et al. 2020

Metals

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The present study investigates the influence of hot-deformation, above β-transus and different thermal treatments on the microstructural and mechanical behaviour of a commercially available Ti-6246 titanium-based alloy, by SEM (scanning electron microscopy), tensile and microhardness testing techniques. The as-received Ti-6246 alloy was hot-deformed—HR by rolling, at 1000 °C, with a total thickness reduction (total deformation degree) of 65%, in 4 rolling passes. After HR, different thermal (solution—ST and ageing—A) treatments were applied in order to induce changes in the alloy’s microstructure and mechanical behaviour. The applied solution treatments (ST) were performed at temperatures below and above β-transus (α → β transition temperature; approx. 935 °C), to 800 °C, 900 °C and 1000 °C respectively, while ageing treatment at a fixed temperature of 600 °C. The STs duration was fixed at 27 min while A duration at 6 h. Microstructural characteristics of all thermomechanical (TM) processed samples and obtained mechanical properties were analysed and correlated with the TM processing conditions. The microstructure analysis shows that the applied TM processing route influences the morphology of the alloy’s constituent phases. The initial AR microstructure shows typical Widmanstätten/basket-weave-type grains which, after HR, are heavily deformed along the rolling direction. The STs induced the regeneration of α-Ti and β-Ti phases, as thin alternate lamellae/plate-like structures, showing preferred spatial orientation. Also, the STs induced the formation of α′-Ti/α″-Ti martensite phases within parent α-Ti/β-Ti phases. The ageing treatment (A) induces reversion of α′-Ti/α″-Ti martensite phases in parent α-Ti/β-Ti phases. Mechanical behaviour showed that both strength and ductility properties are influenced, also, by applied TM processing route, optimum properties being obtained for a ST temperature of 900 °C followed by ageing (ST2 + A state), when both strength and ductility properties are at their maximum (σUTS = 1279 ± 15 MPa, σ0.2 = 1161 ± 14 MPa, εf = 10.1 ± 1.3%).

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“…These processing features generally lead to special microstructures and mechanical properties of LAM-fabricated parts, compared to conventional manufacturing techniques. LAM-fabricated titanium alloy is often distinguished by coarse, columnar prior β grains due to the high temperature gradients [11,12] and fine lamellar or lath-like microstructure within prior β grains as a result of the high cooling rate [13,14]. In addition, LAM-fabricated titanium alloys often exhibit high strength due to refined microstructure and low ductility due to the high level of residual stress [7,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Song

Xie

et al. 2020

Materials

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Refining microstructure is an important issue for laser additive manufacturing (LAM) of titanium alloy. In the present work, the microstructures of LAM-fabricated Ti6Al4V alloy were refined using a low energy density with the combination of a small spot diameter, a low laser power, and a high scanning speed. The microstructure, hardness, wear performance, and molten pool thermal behavior of LAM-fabricated Ti6Al4V coatings were studied. The results show that the grain sizes of both prior β and α phases are strongly dependent on the cooling rate of the molten pool. The fine prior β grains and submicron-scale acicular α phases were obtained under a low energy density of 75 J mm−2 due to the high cooling rate of the molten pool. In addition, the as-fabricated Ti6Al4V sample with submicron-scale acicular α phase showed a very high hardness of 7.43 GPa, a high elastic modulus of 133.6 GPa, and a low coefficient of friction of 0.48. This work provides a good method for improving the microstructure and mechanical performance of LAM-fabricated Ti6Al4V alloy.

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The Martensitic Transformation and Mechanical Properties of Ti6Al4V Prepared via Selective Laser Melting

Cited by 75 publications

References 37 publications

Effect of Build Orientation on the Corrosion Behavior and Mechanical Properties of Selective Laser Melted Ti-6Al-4V

Effect of Build Orientation on the Corrosion Behavior and Mechanical Properties of Selective Laser Melted Ti-6Al-4V

Microstructure and Mechanical Properties Evolution during Solution and Ageing Treatment for a Hot Deformed, above β-transus, Ti-6246 Alloy

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

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