Effect of parameters of the carburized case on the properties of steel 20Kh3MVFA

Autor:	Yu. Yu. Cherkis, A. N. Utkina, M. F. Alekseenko
Rok vydání:	1977
Předmět:	Austenite Quenching Materials science Metallurgy Metals and Alloys chemistry.chemical_element Condensed Matter Physics Fatigue limit Carburizing Carbide chemistry Mechanics of Materials Molybdenum Martensite Carbon
Zdroj:	Metal Science and Heat Treatment. 19:481-485
ISSN:	1573-8973 0026-0673
DOI:	10.1007/bf00713088
Popis:	1. To ensure the highest contact fatigue strength and fatigue limit the carbon concentration in the carburized case on steel 20Kh3MVFA must be higher than for steel 12Kh2N4A-1.3–1.5% as compared with 1.0–1.2%. 2. The contact fatigue strength of steel 20Kh3MVFA is ∼30% higher than that of steel 12Kh2N4A, which is explained by the larger quantity of carbides and the higher concentration of carbon in the solid solution. 3. The highest contact fatigue strength and fatigue limit of steel 20Kh3MVFA are obtained after quenching from carburizing temperature due to the larger quantity of carbon in the solid solution and its higher concentration of chromium and molybdenum. 4. Retained austenite cannot be permitted in the carburized case of highly stressed machine parts. The optimal structure is finely dispersed martensite and fine globular carbides to a depth of 0.15–0.25 mm (after grinding 0.2 mm on each side).
Databáze:	OpenAIRE
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