Effect of Silicon Addition on Microstructure and Mechanical Properties of Cast Titanium Alloys

Zhu, Jun; Kamiya, Akira; Yamada, Takeo; Watazu, Akira; Wen, Shi-Zheng; Naganuma, Katsuyoshi

doi:10.2320/matertrans.42.336

Cited by 41 publications

(22 citation statements)

References 12 publications

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“…0.05 to 0.9 wt pct). [24] They also compared their results with a similar study of Ti-Si system by Zhu et al [25] which reports even greater grain refinement (up to 92 pct) with increase in Si content up to 2.75 wt pct. The Easton and St. John equation (grain size d vs the inverse of Q) for both studies is schematically shown in Figure 6 for such comparison.…”

Section: B Effect Of W On Grain Sizementioning

confidence: 66%

“…It is useful to present a brief review and analysis of previous results on grain refinement for the Ti-Si [24,25] and Ti-B [17,18] systems to understand the applicability and interpretation of the Easton and St. John equation [13,22] for the Ti-W system results presented here. In their study, Bermingham et al observed significant grain refinement of Ti (i.e., average grain diameters dropping from 600 to 200 lm) upon the addition of small quantities of Si (i.e.…”

Section: B Effect Of W On Grain Sizementioning

confidence: 99%

“…For example, while B and Si both have an ability to reduce the grain size, [17,25] these two elements will form intermetallic compounds that may have secondary (perhaps deleterious) effects on the microstructural evolution [24] or the mechanical properties [26] beyond a certain composition limit c 0 . While the overall design of new alloy composition is well beyond this paper, multiple activities are underway [27] to provide tools that can be used in parallel with the emphasis of this paper-affecting grain size.…”

Section: The High Level Of Interest In Additive Manufacturingmentioning

confidence: 99%

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Microstructures and Grain Refinement of Additive-Manufactured Ti-xW Alloys

Mendoza

Samimi

Brice

et al. 2017

Metall Mater Trans A

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It is necessary to better understand the composition-processing-microstructure relationships that exist for materials produced by additive manufacturing. To this end, Laser Engineered Net Shaping (LENSä), a type of additive manufacturing, was used to produce a compositionally graded titanium binary model alloy system (Ti-xW specimen (0 £ x £ 30 wt pct), so that relationships could be made between composition, processing, and the prior beta grain size. Importantly, the thermophysical properties of the Ti-xW, specifically its supercooling parameter (P) and growth restriction factor (Q), are such that grain refinement is expected and was observed. The systematic, combinatorial study of this binary system provides an opportunity to assess the mechanisms by which grain refinement occurs in Ti-based alloys in general, and for additive manufacturing in particular. The operating mechanisms that govern the relationship between composition and grain size are interpreted using a model originally developed for aluminum and magnesium alloys and subsequently applied for titanium alloys. The prior beta grain factor observed and the interpretations of their correlations indicate that tungsten is a good grain refiner and such models are valid to explain the grain-refinement process. By extension, other binary elements or higher order alloy systems with similar thermophysical properties should exhibit similar grain refinement.

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Section: B Effect Of W On Grain Sizementioning

confidence: 66%

Section: B Effect Of W On Grain Sizementioning

confidence: 99%

Section: The High Level Of Interest In Additive Manufacturingmentioning

confidence: 99%

See 1 more Smart Citation

Microstructures and Grain Refinement of Additive-Manufactured Ti-xW Alloys

Mendoza

Samimi

Brice

et al. 2017

Metall Mater Trans A

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“…In addition, it was also reported that when Si is added to pure Ti, Ti silicide is formed at the grain boundaries and/or within the grains, which induces to improve the hardness of Ti-Si alloy due to the precipitation of silicides. 8) In the present study, a formation of Ti silicide(TiSi 2 ) was also observed in the Ti-Si specimens when the Si content is 1.5-2.0 mass%. X-ray diffraction patterns of Ti-Si specimens are shown in Fig.…”

Section: Resultsmentioning

confidence: 62%

“…Boron also has the largest growth restriction factor, but its practical use may be limited by the reduction of tensile elongation due to the precipitation of Ti borides. 7) As calculated in the Table 1, silicon is a great candidate, several researches have reported 6,8) that the effects of Si on the mechanical properties and grain refinement of Ti alloys. However a lattice strain via trace element addition has not been reported so far.…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement and Hardness Increase of Titanium via Trace Element Addition

Lim

Lee

et al. 2010

Mater. Trans.

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The effect of trace Al, V, Sn and Si addition on the grain refinement, hardness, and lattice strain was discussed. From the results of variation in the average grain size, it was found that the growth restriction factor of individual additions is Si > Al > Sn > V in order of their magnitude. The c=a ratio of other Ti alloys except for the Ti-Si alloy were the same value of 1.587 as pure Ti, whereas that of the Ti-Si alloy was 1.581, the lattice strain of which affected the hardness increase. It was then suggested that Si addition to pure Ti plays an important role in the hardness increase, which can be explained by the lattice strain caused by c=a ratio reduction, the decrease in the grain size of Ti-Si alloy, and the formation of Ti silicide at higher Si content.

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Present stage and future prospects of development of compressor material

Kitashima

Koppoju

Yamabe‐Mitarai

2014

Crystal Research and Technology

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Titanium alloys are attractive for use in the compressor of jet engines because of their high strength‐to‐density ratio. Titanium alloys with high temperature capability for high‐pressure compressor components have been developed to increase thermal efficiency of jet engines, resulting in the reduction of CO2 emission and fuel consumption. This study describes the development of high‐temperature titanium alloys, mainly focusing on the effects of alloy composition and microstructure on mechanical properties. Titanium matrix composites and titanium aluminides have also been extensively studied for future application in high‐pressure compressors. In addition, in this study, melting technology of titanium alloys has been introduced because it is a key technology to improve the performance of high‐temperature titanium components.

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Effect of Silicon Addition on Microstructure and Mechanical Properties of Cast Titanium Alloys

Cited by 41 publications

References 12 publications

Microstructures and Grain Refinement of Additive-Manufactured Ti-xW Alloys

Microstructures and Grain Refinement of Additive-Manufactured Ti-xW Alloys

Grain Refinement and Hardness Increase of Titanium via Trace Element Addition

Present stage and future prospects of development of compressor material

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