Hardening of cutting tools by combined gas nitriding method

In order to improve the strength properties of cutting tools made of high-speed steels, the article presents the results of a study of the possibility of using a combined method of surface hardening, which consists in nitriding in an ammonia medium at the first stage and oxidizing the nitrided layer...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-01, Vol.1030 (1), p.12019
Main Authors: Eshkabilov, Kh, Berdiyev, Sh, Kamolov, B
Format: Article
Language:English
Subjects:
Ammonia
Cutting tools
Diffusion layers
High speed tool steels
Intervals
Martensite
Martensitic transformations
Nitrides
Nitriding
Oxidation
Oxide coatings
Retained austenite
Surface hardening
Water vapor
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Summary:In order to improve the strength properties of cutting tools made of high-speed steels, the article presents the results of a study of the possibility of using a combined method of surface hardening, which consists in nitriding in an ammonia medium at the first stage and oxidizing the nitrided layer in water vapor at the second stage. The formation of a thin dense oxide film consisting of a single magnetite and a dense nitride layer under it as well as a zone of internal nitriding following it are studied on the surface to be strengthened. It is established that the combination of the process in the first stage by zaevtektoidnoj temperature for the system "Fe-N" the temperature intervals of martensite transformation of residual austenite and the second step by zaevtektoidnoj temperature for the system "Fe-O" according to temperature intervals and tempering after hardening allows you to get the diffusion nitride-oxide layer with the desired structures and properties on the surface of high-speed steel.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1030/1/012019