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Journal Article

Thermodynamic reasoning for colossal N supersaturation in austenitic and ferritic stainless steels during low-temperature nitridation

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Meka,  Sai Ramudu
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee 247667, India;
Stress and Defects Driven Phase Transformation, Max Planck Partner Group, Interdepartmental and Partner Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Sasidhar, K. N., & Meka, S. R. (2019). Thermodynamic reasoning for colossal N supersaturation in austenitic and ferritic stainless steels during low-temperature nitridation. Scientific Reports, 9(1): 7996. doi:10.1038/s41598-019-44410-0.


Cite as: https://hdl.handle.net/21.11116/0000-0009-72E6-3
Abstract
Colossal N supersaturation of ferritic as well as austenitic stainless steels during low temperature gaseous nitridation treatments has lately gained much technological significance. However, available thermodynamic models to calculate the N paraequilibrium solubility limits have failed to explain the levels of colossal N supersaturation observed in several cases of nitrided ferritic/austenitic stainless steels. In this work, we show that consideration of N dissolution induced spinodal decomposition is essential in calculating the N paraequilibrium solubility limit for both ferritic and austenitic stainless steels. This modification in the thermodynamic model has led to the successful explanation of the thermodynamic cause for the colossal N supersaturation in ferritic and austenitic stainless steels. Available experimental observations in literature support the occurrence of spinodal decomposition. © 2019, The Author(s).