Structure and Phase Composition of Ti-6Al-4V Samples Produced by Direct Laser Deposition

Shalnova, S.A.; Panova, G. A.; Buczak, Nadine

doi:10.4028/www.scientific.net/kem.822.467

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…The α + β titanium alloy Ti-6Al-4V is widely used in aerospace applications, and much research has been conducted on AM with this alloy. There are many works devoted to the study of the structure and properties of additively manufactured Ti-6Al-4V in the building as well as the post-processing state [ 9 , 10 , 11 , 12 ]. Heat treatments (HTs) are solved problems of structural and phase inhomogeneity, residual stresses, and anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

et al. 2021

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Additive manufacturing of titanium alloys is one of the fastest growing areas of 3D metal printing. The use of AM methods for parts production in the aviation industry is especially promising. During the deposition of products with differently sized cross-sections, the thermal history changes, which leads to non-uniformity of the structure and properties. Such heterogeneity can lead to failure of the product during operation. The structure of deposited parts, depending on the thermal cycle, may consist of α’, α + α’ + β’, and α + β in different ratios. This problem can be solved by using heat treatment (HT). This paper presents research aimed towards the determination of optimal heat treatment parameters that allows the reception of the uniform formation of properties in the after-treatment state, regardless of the initial structure and properties, using the example of a deposited Ti-6Al-4V gas turbine blade.

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Section: Introductionmentioning

confidence: 99%

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

et al. 2021

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“…The phase composition has an essential effect on the Ti-6Al-4V properties consisting of the hexagonal close-packed (hcp) a phase and the body-centered cubic (bcc) b phase, but depending on the cooling rate, the formation of a hard and brittle martensite phase (a¢) is also possible. During the printing process, the cooling rate reaches the values of 10 4 -10 6 K/s forming the a¢ phase (Ref [15][16][17][18]. The cooling rate above 410 °C/s leads to the full martensite structure in Ti-6Al-4V alloy, while the rate of 1.5 °C/s provides the totally a + b composition (Ref 19).…”

Section: Introductionmentioning

confidence: 99%

Effect of Scanning Strategy on Mechanical Properties of Ti-6Al-4V Alloy Manufactured by Laser Direct Energy Deposition

Gushchina

Kuzminova

Kudryavtsev

et al. 2021

J. of Materi Eng and Perform

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Direct energy deposition (DED) is an additive manufacturing method that allows repairing the broken parts and building the meter-scale samples. However, the printing of large parts is associated with huge residual stresses and martensite phase formation, which can change the geometry of final samples or initiate the crack. The last factor is especially important for titanium alloys. In this work, we investigated the effect of DED thermal history on the obtained structural and mechanical properties of Ti-6Al-4V using a thermocouple. It was demonstrated that printing with long pauses leads to a¢ phase formation, which embrittles the material. Continuous printing with small pauses between tracks leads to the formation of the dual a+b structure. The effect of the texture on the material properties is also discussed. As a result of the study, the specific DED process parameters allow the same mechanical characteristics for as-built titanium alloy and the alloy after heat treatment.

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Structure and Phase Composition of Ti-6Al-4V Samples Produced by Direct Laser Deposition

Cited by 2 publications

References 21 publications

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

Effect of Scanning Strategy on Mechanical Properties of Ti-6Al-4V Alloy Manufactured by Laser Direct Energy Deposition

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