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Thermodynamic Modelling and Experimental Investigation of Tungsten Partitioning in Nickel Based Alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Thermo-Calc software AB develops high quality thermodynamic and kinetic databases to predict and simulate accurately multi-component phase behaviour in complex systems. One problem with their Ni-based alloys and superalloy solutions database (TCNI8) is poor description of tungsten partitioning for multi-component nickel based alloys. This work investigates the thermodynamic description of some lower-order systems i.e., Ni-W, Al-Ni-W and Cr-Ni-W by performing key experiments on three binary Ni-W alloys, and two ternary alloys (Al-Ni-W and Cr-Ni-W). Experiments at four different temperatures were carried out in which alloys were homogenized, equilibrated, quenched and investigated to determine the equilibrium solid/liquid compositions. Experimental results are used to validate the thermodynamic descriptions of the liquid and the fcc phase. Unlike ternary Al-Ni-W and Cr-Ni-W, binary Ni-W reproduced the experimental information in a satisfactory way. Ternary parameters for fcc are changed to fit the experimental results of this work. The findings of this work highlight that ternary parameters for the fcc of Al-Ni-W and Cr-Ni-W systems significantly effect the tungsten partitioning values in higher order systems.

Abstract [sv]

Thermo-Calc Software AB utvecklar termodynamiska och kinetiska databaser av hög kvalitet för att korrekt kunna förutsäga och simulera jämvikter och fasomvandlingar i komplexa flerkomponentsystem. Ett problem med deras databas för Ni-baslegeringar och superlegeringar (TCNI8) är att beskrivning av volframpartitionering stämmer dåligt för nickelbaslegeringar. I detta arbete undersöktes den termodynamiska beskrivningen av vissa lägre system, dvs Ni-W, Al-Ni-W och Cr-Ni-W genom att utföra nyckelförsök på tre binära Ni-W-legeringar och två ternära legeringar (Al-Ni-W och Cr-Ni-W). Experimentvid fyra temperaturer utfördes i vilka legeringarna homogeniserades,jämviktsbehandlades, släcktes och undersöktes för att bestämma sammansättning för jämvikt fast fas/smälta. De erhållna experimentella resultaten användes för att validera den termodynamiska beskrivningen av smältan och fcc-fasen. Till skillnad från ternära Al-Ni-W ochCr-Ni-W, reproducerade den experimentella informationen den binära Ni-W-beskrivningen tillfredsställande. Ternära parametrar för fcc justerades efter de experimentella resultaten från detta arbete. Resultaten visar att de ternära parametrarna för fcc i Al-Ni-W och Cr-Ni-W systemen signifikant påverkar volframs fördelning mellan fast fas och smälta i nickelbaslegeringar.

Place, publisher, year, edition, pages
2018. , p. 25
Keywords [en]
Calphad; Tungsten partitioning; Nickel based alloys; Thermo-Calc; Thermodynamic database; Ni-W binary
Keywords [sv]
Calphad; volframpartitionering; Nickelbaslegering; Termo-Calc; Termodynamisk databas; Ni-W
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-235643OAI: oai:DiVA.org:kth-235643DiVA, id: diva2:1252394
External cooperation
Thermo-Calc Software AB
Educational program
Master of Science - Materials Science and Engineering
Supervisors
Examiners
Available from: 2018-10-10 Created: 2018-10-01 Last updated: 2018-10-29Bibliographically approved

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