&amp;beta;-Grain Refinement of &amp;alpha;+&amp;beta;-Type Ti&amp;ndash;4.5Al&amp;ndash;6Nb&amp;ndash;2Fe&amp;ndash;2Mo Alloy by Using Rare-Earth-Oxide Precipitates

Ueda, Kyosuke; Nakaoka, Shinichiro; Narushima, Takayuki

doi:10.2320/matertrans.mc201207

Cited by 11 publications

(2 citation statements)

References 22 publications

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“…Boron (B), [28,29] tungsten (W) [30] , and a number of rare-earth elements (La, Y, etc.) [31][32][33] have been shown to affect the phase transformation and produce a significant constitutional undercooling and an increase in the nuclei population to encourage equiaxed grain formation in Ti and Ti-based alloys. Nevertheless, although B has a large Q, its use as a grain refiner may be limited when its deleterious effect on ductility caused by the precipitation of titanium borides is considered.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Iron in Minimizing the Microstructural Anisotropy of Ti-6Al-4V Produced by Laser Powder-Bed Fusion

Simonelli

McCartney

Barriobero-Vila

et al. 2020

Metall Mater Trans A

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There remains a significant challenge in adapting alloys for metal-based additive manufacturing (AM). Adjusting alloy composition to suit the process, particularly under regimes close to industrial practice, is therefore a potential solution. With the aim of designing new Ti-based alloys of superior mechanical properties for use in laser powder-bed fusion, this research investigates the influence of Fe on the microstructural development of Ti-6Al-4V. The operating mechanisms that govern the relationship between the alloy composition (and Fe in particular) and the grain size are explored using EBSD, TEM, and in situ high-energy synchrotron X-ray diffraction. It was found that Fe additions up to 3 wt pct lead to a progressive refinement of the microstructure. By exploiting the cooling rates of AM and suitable amount of Fe additions, it was possible to obtain microstructures that can be optimized by heat treatment without obvious precipitation of detrimental brittle phases. The resulting microstructure consists of a desirable and well-studied fully laminar a + b structure in refined prior-b grains.

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Section: Introductionmentioning

confidence: 99%

The Influence of Iron in Minimizing the Microstructural Anisotropy of Ti-6Al-4V Produced by Laser Powder-Bed Fusion

Simonelli

McCartney

Barriobero-Vila

et al. 2020

Metall Mater Trans A

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“… Wang et al (2021 ) investigated and discussed the possibility of Y 2 O 3 acting as nucleant for the formation of α-grains during allotropic transformation, consequently leading to a refined microstructure. In addition, the pinning effect of Y 2 O 3 on (prior) β-grains was discussed ( Cui et al, 2002 ; Ueda et al, 2013 ; Zhang et al, 2020b ; Wang et al, 2021 ). Furthermore, the nucleation of α-grains on TiB particles was investigated and described in several publications, as summarized by Singh and Ramamurty (2021 ).…”

Section: Discussionmentioning

confidence: 99%

Laser powder bed fusion (LPBF) of commercially pure titanium and alloy development for the LPBF process

Haase,

Siemers,

Rösler

2023

Front. Bioeng. Biotechnol.

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Laser powder bed fusion (LPBF) of titanium or titanium alloys allows fabrication of geometrically more complex and, possibly, individualized implants or osteosynthesis products and could thus improve the outcome of medical treatments considerably. However, insufficient LPBF process parameters can result in substantial porosity, decreasing mechanical properties and requiring post-treatment. Furthermore, texturized parts with anisotropic properties are usually obtained after LPBF processing, limiting their usage in medical applications. The present study addresses both: first, a design of experiments is used in order to establish a set of optimized process parameters and a process window for LPBF printing of small commercially pure (CP) titanium parts with minimized volume porosity. Afterward, the first results on the development of a biocompatible titanium alloy designed for LPBF processing of medical implants with improved solidification and more isotropic properties are presented on the basis of conventionally melted alloys. This development was performed on the basis of Ti-0.44O-0.5Fe-0.08C-0.4Si-0.1Au, a near-α alloy presented by the authors for medical applications and conventional manufacturing, with yttrium and boron additions as additional growth restriction solutes. In terms of LPBF processing of CP titanium grade 1 powder, a high relative density of approximately 99.9% was obtained in the as-printed state of the volume of a small cubical sample by using optimized laser power, scanning speed, and hatch distance in combination with a rotating scanning pattern. Moreover, tensile specimens processed with these volume settings and tested in the as-printed milled state exhibited a high average yield and ultimate tensile strength of approximately 663 and 747 N/mm2, respectively, combined with a high average ductility of approximately 24%. X-ray diffraction results suggest anisotropic mechanical properties, which are, however, less pronounced in terms of the tested specimens. Regarding alloy development, the results show that yttrium additions lead to a considerable microstructure refinement but have to be limited due to the occurrence of a large amount of precipitations and a supposed higher propensity for the formation of long columnar prior β-grains. However, phase/texture and microstructure analyses indicate that Ti-0.44O-0.5Fe-0.08C-0.4Si-0.1Au-0.1B-0.1Y is a promising candidate to achieve lower anisotropy during LPBF processing, but further investigations on LPBF printing and Y2O3 formation are necessary.

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Review on the Creep Resistance of High-Temperature Titanium Alloy

Deng

Zhang

et al. 2021

Trans Indian Inst Met

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β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates

Cited by 11 publications

References 22 publications

The Influence of Iron in Minimizing the Microstructural Anisotropy of Ti-6Al-4V Produced by Laser Powder-Bed Fusion

The Influence of Iron in Minimizing the Microstructural Anisotropy of Ti-6Al-4V Produced by Laser Powder-Bed Fusion

Laser powder bed fusion (LPBF) of commercially pure titanium and alloy development for the LPBF process

Review on the Creep Resistance of High-Temperature Titanium Alloy

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