Solidification behaviour of TiAl-based alloys studied by directional solidification technique

Lapin, J.; Gabalcová, Zuzana

doi:10.1016/j.intermet.2010.11.021

Cited by 110 publications

(51 citation statements)

References 24 publications

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“…2. The furnace, fully described elsewhere [16], consisted of a cold formed smooth molybdenum resistance heating element in the hot zone. The cylindrical heating element had a length of 300mm and inside diameter of 33mm.…”

Section: The Experiments Apparatusmentioning

confidence: 99%

An experimental–numerical method for estimating heat transfer in a Bridgman furnace

Mooney

McFadden

Gabalcová

et al. 2014

Applied Thermal Engineering

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Direct measurement of heat flux and heat transfer coefficients in a Bridgman furnace is not always possible using traditional methods. This study characterised a vertical tubular Bridgman furnace using experimental data so that the estimated heat flux and heat transfer coefficients may be used in simulations of future experiments using the same furnace. An experimental-numerical method is presented where a discrete proportional integral derivative controller manipulates the radial heat flux in a front tracking solidification model so that the output temperature profile matches experimental data. The method is applicable for other experimentalists and modellers and its usefulness is demonstrated by example. Highlights A combined experimental-numerical method to estimate heat flux and heat transfer coefficients in a Bridgman furnace is outlined in detail.  The inverse heat transfer problem is solved using a discrete proportional integral derivative controller in series with a front tracking solidification model.  The usefulness of the method is demonstrated by example.

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Section: The Experiments Apparatusmentioning

confidence: 99%

An experimental–numerical method for estimating heat transfer in a Bridgman furnace

Mooney

McFadden

Gabalcová

et al. 2014

Applied Thermal Engineering

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“…Among various processing techniques, precise casting offers the most cost effective method for production of complex shaped components from TiAl-based alloys [4,5]. Until now, no refractory material was found to be absolutely inert against these alloys and some interactions between melted alloy and crucible and mould materials always occurred during melting and casting [7][8][9][10][11][12][13][14][15][16][17]. These melt-ceramic material interactions lead to contamination and to degradation of some mechanical properties of cast components [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the use of cheap crucible and mould refractory materials reduces significantly production cost of castings [7,8,10]. Numerous publications deal with the melting of TiAl--based alloys in ceramic crucibles made out of Y 2 O 3 [9-11, 13, 14], CaO [7,8,[10][11][12], Al 2 O 3 [10,12,[14][15][16], ZrO 2 [7,10] and others. However, there is a lack of information concerning melting of TiAl-based alloys in graphite crucibles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Čegan¹,

Szurman²,

Kursa³

et al. 2016

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Three TiAl-based alloys with nominal composition Ti-47Al-8Nb, Ti-47Al-8Ta and Ti-47Al--8Ta-0.3Y (at.%) were prepared by induction melting in graphite crucibles and centrifugal casting into graphite moulds. Chemical composition, microstructure and mechanical properties of the as-cast alloys are characterised. The melting in the graphite crucible leads to an increase of carbon content from 460 to 1020 wtppm and formation of fine carbide particles predominantly in the γ(TiAl) phase. Beside fine carbides, the addition of 0.3 at.% of yttrium results in formation of fine Y2O3 and YAl2 particles. The oxygen content depends on the chemical composition and varies between 330 and 780 wtppm for Ta and Nb containing alloys, respectively. The as-cast alloys exhibit relatively high values of room-temperature compression yield strength up to 922 MPa, ultimate compression strength up to 1793 MPa and plastic deformation to fracture up to 24.3 %. The compression yield strength increases linearly with increasing Vickers microhardness of the as-cast alloys. From the point of view of chemical composition, microstructure and studied mechanical properties, induction melting in the graphite crucible and centrifugal casting into graphite mould can be considered as a suitable method of preparation of TiAl-based alloys.K e y w o r d s :

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“…al) DS-processed alloys and related mechanical properties using both FZ and Bridgman type [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Temperature Gradient Estimation of Floating Zone Furnace by Mean Lamellar Spacing Measurement in DS-processed TiAl Alloys

Jung¹,

Park²,

Wee³

et al. 2015

Journal of the Korean Society for Heat Treatment

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In this study, the temperature gradient of a floating zone (FZ) apparatus, which is very difficult to directly measure, could be estimated by using the relationships between the lamellar spacing of directionally solidified TiAl alloys and the solidification rate, It was found that the calculated temperature gradient of the FZ apparatus was much higher, and almost ten times higher than that of a Bridgman type directional solidification apparatus.

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Solidification behaviour of TiAl-based alloys studied by directional solidification technique

Cited by 110 publications

References 24 publications

An experimental–numerical method for estimating heat transfer in a Bridgman furnace

An experimental–numerical method for estimating heat transfer in a Bridgman furnace

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Temperature Gradient Estimation of Floating Zone Furnace by Mean Lamellar Spacing Measurement in DS-processed TiAl Alloys

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