Gaseous Nitriding of Binary Ni-Cr Alloys - Observation and Interpretation of Microstructural Features

• Autorzy: Kodentsov A. , Cserháti C.

Identyfikatory

DOI

10.24425/amm.2022.139695

• Języki publikacji: EN

Abstrakty

EN

Gaseous nitriding of binary Ni-Cr solid-solution alloys was studied at 1125ºC over the range 1 to 6000 bar of N₂-pressure. At the specified temperature the nitriding response of the Ni-Cr alloys depends on the Cr-content in the initial alloy and activity (fugacity) of nitrogen at the gas/metal interface. Transition from cubic δ-CrN to hexagonal β-Cr₂N precipitation occurs within the reaction zone after nitrogenization at 1125ºC under nitrogen pressure 100-6000 bar when chromium content in the initial alloy is 28 at. % or higher. It was found that a ternary phase, π (Cr_12.8Ni_7.2N_4.0) is formed inside the Ni32Cr alloy upon cooling in nitrogen after nitriding at 1125ºC and 1 bar of N₂. Experimental evidence is presented that π-phase is involved in peritectoid relations with β-Cr₂N and γ-(Ni-Cr) solid solution. It was also demonstrated that nitriding behaviour of the Ni-Cr alloy can be rationalized using pertinent phase diagram information, but, in some cases, effect of mechanical stresses induced upon the internal precipitation can vitiate this prediction.

Słowa kluczowe

EN

nitridation; Ni-Cr-N system; diffusion; internal precipitation; microstructure

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2022
• Tom: Vol. 67, iss. 3
• Strony: 1007--1020
• Opis fizyczny: Bibliogr. 33 poz., fot., rys., wykr.

Twórcy

autor

Kodentsov A.

• Mat-Tech BV, Development & Testing, Son, The Netherlands

• https://orcid.org/0000-0003-0997-1244

autor

Cserháti C.

• University of Debrecen Hungary Faculty of Sciences and Technology, Department of Solid State Physics, Hungary

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).