[Kovove materialy - Metallic materials]
    Sun - December 08, 2024 - 02:00 No. of hits : 1804856 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 50 (2012), Issue 5

Plasma nitriding and its influence on contact fatigue of sintered steel
RODZINAK, D. ,HVIZDOŠ, P., ČERŇAN, J., SEMRÁD, K.
vol. 50 (2012), no. 5, pp. 365 - 371
DOI: 10.4149/km_2012_5_365

Abstract
Plasma nitriding treatment in combination with shot peening is a promising way of material processing to improve contact fatigue resistance of PM components made of prealloyed Astaloy CrL powder. This powder was used to manufacture four material variants differing by carbon contents – 0.3% and 0.7%C, and by surface status (as received and shot peened). Tests were done on a pin- on-disc type device and evaluated in terms of formation of pittings at 50.106 cycles. They revealed the positive effects of plasma nitriding. In the material with 0.3%C, the fatigue resistance increased by 65 % and if the nitriding was preceded by shot peening, it increased by 172 %. In the material with 0.7%C, the corresponding increase was 38 % and 107 %, respectively. The surface nitrided layer, the mechanisms of its damage, and causes of pitting formation and growth depending on Hertzian stresses are described.

Key words
Cr-sintered steels, contact fatigue, surface modification, pittings

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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