Influence of solution heat treatment on the microstructure and hardness of a high carbon alloy from the Ni-Co-Cr-Ta-Al system

• Autorzy: Biała P.

Identyfikatory

DOI

10.5604/01.3001.0010.5965

• Języki publikacji: EN

Abstrakty

EN

Purpose: The main purpose of this paper was to determine the influence of the temperature of solution heat treatment on the microstructure and hardness of the newly designed model alloy, intended for working at high temperatures. Design/methodology/approach: A mass weighing approx. 1 kg was test melted in a vacuum furnace and cast into a ceramic mould. Samples for investigations were solution heat treated at the temperature range of 1020-1170°C. After heating to the desired temperature, the samples were held at this temperature for 2 hours and then water-cooled. Findings: The main constituents of the microstructure of the Ni-Co-Cr-Ta-Al-C alloy in as-cast state are: the γ phase, which constitutes the matrix, the γ’ phase (γ’ phase occurs as fine globular precipitates) as well as primary TaC and Cr7C3 carbides. Irregularly shaped primary carbides are uniformly distributed and do not form agglomerates. Solution heat treatment of the investigated alloy at exceedingly higher temperatures causes a slow decrease of chromium primary carbides. Research limitations/implications: Taking into account the chemical composition of the investigated alloy, it is reasonable to expect the heat treatment should improve its properties. At 1020°C, γ’ phase precipitations dissolve and it is possible to achieve a super saturated solid solution matrix. Next, correct aging treatment should by applied. Practical implications: A new model alloy which allows to design a new material for high temperature applications. Originality/value: New chemical compositions and microstructure of Ni-based materials for high temperature application with high carbon contents. Additionally, the new alloy is strengthened not only by a high carbon volume fraction but also by intermetallic phases.

Słowa kluczowe

EN

tool materials; Ni-based alloys; intermetallic phases; carbides

PL

materiały narzędziowe; stopy na bazie niklu; fazy międzymetaliczne; węgliki

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2017
• Tom: Vol. 87, nr 1
• Strony: 5--11
• Opis fizyczny: Bibliogr. 32 poz.

Twórcy

autor

Biała P.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
• Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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Uwagi

PL

Opracowanie w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018)