Microstructure of a modulated Ti-6Al-4V – Cu alloy fabricated via in situ alloying in laser powder bed fusion

Goettgens, Valerie Sue; Kaserer, Lukas; Braun, J.; Letofsky-Papst, Ilse; Mitsche, Stefan; Leichtfried, Gerhard

doi:10.1016/j.mtla.2023.101731

Cited by 9 publications

(2 citation statements)

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“…For this purpose, Ti-6Al-4V in situ alloyed with 3 wt% Cr is investigated with respect to the effect on microstructure evolution, solidification behavior, and mechanical properties. For comparability, the addition of 3 wt% Cr is approximately equivalent to 3.5 wt% Cu in Ti-6Al-4V calculated in at%, which was fabricated in previous studies [23]. Similar to Ti-6Al-4V with 3.5 wt% Cu, martensite decomposition is successfully achieved in this study.…”

Section: Introductionmentioning

confidence: 53%

“…A mechanical characterization was not performed. In one of our own studies, Ti-6Al-4V alloyed with 3.5 wt% Cu has been investigated, showing increased tensile strength, an in situ martensite decomposition, and the precipitation of Ti 2 Cu [23]. In our own study and in the studies of Vrancken et al [21], Zhang et al [22], and Nagase et al [11], the alloying elements added to Ti-6Al-4V were Cu, Mo, mainly Fe in the case of 316 L, and Cr.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Ti-6Al-4V In Situ Alloyed with 3 wt% Cr by Laser Powder Bed Fusion

Goettgens,

Weber,

Braun

et al. 2024

Metals

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This work studied the microstructure and mechanical properties of Ti-6Al-4V in situ alloyed with 3 wt% Cr by laser powder bed fusion (LPBF). Specimens with a relative density of 99.14 ± 0.11% were produced, showing keyhole and lack of fusion pores. Due to incomplete mixing of the components during melting, chemical inhomogeneities were observed in the solidified material. The addition of Cr promoted thermal supercooling during solidification and induced a reduction in the primary β grain size in the longitudinal direction and a weakening of the otherwise strong ⟨100⟩β texture, both typical issues for Ti-6Al-4V produced by LPBF. The primary β at first transformed martensitically to α’, but by preheating the substrate plate to 500 °C and cyclically reheating the material by melting subsequent layers, in situ martensite decomposition was achieved, resulting in a fine lamellar α + β microstructure. In addition, the B19 phase was detected in the β matrix, presumably caused by Fe impurities in the Cr powder feedstock. Specimens exhibited a hardness of 402 ± 18 HV10, and an excellent ultimate tensile strength of 1450 ± 22 MPa at an elongation at break of 4.5 ± 0.2%.

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Section: Introductionmentioning

confidence: 53%