Low-temperature carbonitriding of steel combined with quenching of the surface layer

Autor:	G. N. Neustroev, Yu. M. Lakhtin, V. M. Botov
Rok vydání:	1974
Předmět:	Quenching Materials science Carbonitriding Metallurgy Metals and Alloys chemistry.chemical_element Condensed Matter Physics Carburizing Diffusion layer Ammonia chemistry.chemical_compound chemistry Mechanics of Materials Martensite Surface layer Carbon
Zdroj:	Metal Science and Heat Treatment. 16:823-826
ISSN:	1573-8973 0026-0673
DOI:	10.1007/bf00664242
Popis:	1. A new process of combined low-temperature carbonitriding with quenching of the surface layer has been developed to improve the wear resistance of machine parts. 2. Carbonitriding is conducted at 690–700°. In the first 2–3 h the surface of the steel is austenitized in a mixture of 5–10% NH3+90–95% N2 for carbon and low-alloy steels and in 30% NH3+70% N2 for highalloy steels. In the following 2–5 h carbonitriding occurs at the same temperature in an atmosphere of carburizing gases and ammonia, followed by quenching in oil. 3. After this new treatment of steels 20Kh and 40Kh a diffusion layer 0.4–0.7 mm thick is formed that consists of a carbonitride zone 10–20 μ thick at the surface, a martensite zone with HV 700–800 to a depth of 0.08–0.12 mm, and a transition zone 0.25–0.5 mm deep.
Databáze:	OpenAIRE
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