@ARTICLE{Kodentsov_A._Gaseous_2022, author={Kodentsov, A. and Cserháti, C.}, volume={vol. 67}, number={No 3}, journal={Archives of Metallurgy and Materials}, pages={1007-1020}, howpublished={online}, year={2022}, publisher={Institute of Metallurgy and Materials Science of Polish Academy of Sciences}, publisher={Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences}, abstract={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 (Cr12.8Ni7.2N4.0) 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.}, type={Article}, title={Gaseous Nitriding of Binary Ni-Cr Alloys – Observation and Interpretation of Microstructural Features}, URL={http://journals.pan.pl/Content/124051/PDF-MASTER/AMM-2022-3-26-Kodenstov.pdf}, doi={10.24425/amm.2022.139695}, keywords={nitridation, Ni-Cr-N system, diffusion, internal precipitation, microstructure}, }