NDLI: Nature of YN Phase Formed with Low Temperature Plasma Nitriding of Austenitic Stainless Steels

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Nature of YN Phase Formed with Low Temperature Plasma Nitriding of Austenitic Stainless Steels

Content Provider	Scilit
Author	Yasumaru, Naoki
Copyright Year	2020
Description	The surface nitrided layer of austenitic stainless steels plasma-nitrided at a relatively low temperature of about 623 K in an $H_{2}$-rich plasma has been investigated in order to elucidate the nature of an f.c.t. nitride $Y_{N}$ formed in this layer which has high corrosion resistance and a high hardness of about Hv 1500. The concentration profile of nitrogen in this layer showed a gradual decrease from a maximum value of about 9.5 mass% at the surface to a minimum value of about 6 mass% at the nitriding substrate interface. $Y_{N}$ nitride was formed only in the low-temperature plasma-nitrided layer of austenitic stainless steels of Fe–Cr–Ni, and not in the austenitic steels of Fe–high Ni or Fe–high Mn and in the ferritic stainless steels of Fe–Cr. Low temperature nitrided specimens were vacuuum-annealed above 723 K in the case of 18Cr–8Ni and 18Cr–20Ni steels, α phase and CrN was formed accompanied with the disappearance of the newly developed $Y_{N}$ phase. In the case of stable 18Cr–48Ni steel, α phase was not formed. The superior corrosion resistance of low temperature nitrided stainless steels deteriorates above 723 K owing to the disappearance of the $Y_{N}$ phase and the formation of α phase and CrN. Book Name: Stainless Steel 2000
Related Links	https://content.taylorfrancis.com/books/download?dac=C2016-0-26570-8&isbn=9780367814151&doi=10.1201/9780367814151-23&format=pdf
Ending Page	245
Page Count	17
Starting Page	229
DOI	10.1201/9780367814151-23
Language	English
Publisher	Informa UK Limited
Publisher Date	2020-01-31
Access Restriction	Open
Subject Keyword	Book Name: Stainless Steel 2000 Coatings and Films Nitrogen Low Temperature Steels Nitrided Stainless
Content Type	Text
Resource Type	Chapter

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