GAS NITRIDING WITH DEEP CRYOGENIC TREATMENT OF HIGH-SPEED STEEL

Nitriding with subsequent heat treatment in combination with deep cryogenic treatment (DCT) produces nitrided layers with specific properties. Layers with unique properties result from the dissolution of subsurface layers of iron nitrides and subsequent nitrogen diffusion into the substrate during a...

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Bibliographic Details
Published inActa Metallurgica Slovaca (Online) Vol. 24; no. 2; pp. 187 - 193
Main Authors Hradil, David, Duchek, Michal, Hrbáčková, Taťána, Ciski, Aleksander
Format Journal Article
LanguageEnglish
Published SciCell s.r.o 01.01.2018
Subjects
Deep Cryogenic Treatment
Hardness
Metallography
Nitriding
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Summary:Nitriding with subsequent heat treatment in combination with deep cryogenic treatment (DCT) produces nitrided layers with specific properties. Layers with unique properties result from the dissolution of subsurface layers of iron nitrides and subsequent nitrogen diffusion into the substrate during austenitisation. Fine precipitates of carbonitrides eventually form during DCT and tempering. Intermediate deep cryogenic treatment was performed between the quenching and tempering steps. This work is based on comparing nitrided layers obtained using conventional treatment parameters with nitrided layers from novel processes. The experimental material was DIN 1.3343 (Czech Standard 41 9830) high-speed steel. Several treatment methods were compared in terms of the resulting hardness and metallographic characteristics.
ISSN:1335-1532
1338-1156
DOI:10.12776/ams.v24i2.1058