Advances in the Systems and Processes for the Production of Gamma Titanium Aluminide Bars and Powder

Haun, R.E.

doi:10.1007/s11837-017-2578-1

Cited by 3 publications

(4 citation statements)

References 14 publications

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“…Titanium alloys are increasingly used in aerospace and automotive applications. New melting techniques and practices are required to achieve desirable mechanical properties for critical components (Haun, 2017). The cold crucible technique, alternatively known as the induction skull melting (ISM), is commonly used to melt the titanium alloys with additional stirring created by electromagnetic forces.…”

Section: Introductionmentioning

confidence: 99%

“…Using the tilt casting technique, the liquid alloy experiences significant loss of the required superheat (Bojarevics et al , 2004); therefore, various bottom pouring techniques were proposed. The graphite/ceramics nozzle (Haun, 2017) is the most successful in industrial applications, however, suffers from deterioration due to erosion and needs replacement after each casting. A new type of nozzle composed of copper segments was tried and tested in (Okumura et al , 2006; Okumura et al , 2009); however, the design did not find a widespread application due to uncontrollable outflow from the crucible and the low energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The paper demonstrates the importance of the AC magnetic interaction effects on the particle transport and the eventual separation during the cold crucible operation accounting for the solidifying skull formation and the melt outflow to the nozzle at the bottom. The nonconsumable nozzle made of copper segments could help to solve the problem of the short life cycle of traditional graphite/ceramics type of nozzles used in the existing ISM devices (Haun, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Cold crucible melting with bottom pouring nozzle

Bojarevics

Pericleous

2019

COMPEL

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Purpose The purpose of this paper is to investigate a new type of nozzle which is free from erosion and non-contaminating the outflow metal. Cold crucible melting technique with electromagnetic induction is used to obtain reactive metal castings and produce high-quality metal powders for aerospace, automotive and medical applications. An important part of this technology is the nozzle used to pour the molten alloy through the bottom opening. Design/methodology/approach The paper uses mathematical modeling technique, previously validated on multiple similar cases, to investigate a new type of nonconsumable nozzle made of copper segments. Findings The design of the nozzle requires to satisfy the narrow balance between the thin solidified protective layer on the wall while avoiding the blockage of the outflow if the nozzle is frozen completely. The sensitivity of the outflow to the nozzle diameter is investigated. The AC electromagnetic force leads to high mixing rates, transitional flow structures and turbulence of the melt, contributing to the melt shape dynamics and the heat loss to walls. Originality/value The beneficial features of the cold crucible melting to purify the melt from particulate contamination are explained using the full melting and pouring cycle.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cold crucible melting with bottom pouring nozzle

Bojarevics

Pericleous

2019

COMPEL

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“…Intermetallic TiAl-based alloys are promising structural materials for high-temperature aerospace and automotive industry applications up to about 750 • C [1][2][3][4][5][6]. Depending on their chemical composition and processing parameters, these alloys can be produced with four different types of microstructure: near-gamma (NG), duplex (DP), near lamellar (NL) and fully lamellar (FL).…”

Section: Introductionmentioning

confidence: 99%

Grain refinement of cast peritectic TiAl-based alloy by solid-state phase transformations

Kamyshnykova¹,

Lapin²

2018

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The effect of solid-state phase transformations on grain refinement of cast peritectic TiAl-based alloy with nominal composition Ti-47Al-5Nb-0.2B-0.2C (at.%) has been investigated. Three multi-stage heat treatment routes consisting of pretreatment in single α phase field followed by air, oil or water cooling and subsequent annealing in α + γ or single α fields were applied to refine grain structure of the alloy. The microstructure of the as-cast samples consists of coarse fully lamellar α2(Ti3Al) + γ(TiAl) grains with a grain size of 1310 µm. The annealing of the pretreated samples consisting of massive γM and fine lamellar α2 + γ grains in the α + γ phase field leads to the formation of a duplex type of microstructure composed of lamellar α2 + γ and single γ phase grains with a grain size ranging from 14 to 22 µm. The solution annealing in the single α phase field of the pretreated samples aged in the α + γ phase field leads to the formation of fully lamellar α2 + γ grains with a grain size ranging from 395 to 472 µm.

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Electromagnetic particle separation in the cold crucible melting with novel type bottom pouring nozzle

Bojarevics

Pericleous

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Advances in the Systems and Processes for the Production of Gamma Titanium Aluminide Bars and Powder

Cited by 3 publications

References 14 publications

Cold crucible melting with bottom pouring nozzle

Cold crucible melting with bottom pouring nozzle

Grain refinement of cast peritectic TiAl-based alloy by solid-state phase transformations

Electromagnetic particle separation in the cold crucible melting with novel type bottom pouring nozzle

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