EFFECT OF PLASMA NITRIDING ON THE NOTCH TOUGHNESS OF SPRING STEEL

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60162694%3AG43__%2F16%3A00532674" target="_blank" >RIV/60162694:G43__/16:00532674 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.metal2016.com/cz/" target="_blank" >http://www.metal2016.com/cz/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

EFFECT OF PLASMA NITRIDING ON THE NOTCH TOUGHNESS OF SPRING STEEL

Popis výsledku v původním jazyce

Specimens made from spring steel 54SiCr6 were nitrided using various parameters of plasma nitriding in order to achieve a layer of variable thickness. The microstructure, phase constitution, hardness and case hardness depth were investigated. Subsequently notch toughness was measured by the instrumented Charpy impact test on 10x10x55 mm test specimens with U-notch 5 mm depth. Instrumented Charpy impact test was carried out at -40 °C, +21 °C and +70 °C. Results of notch toughness were correlated with the structure, chemical composition and the depth of the nitrided layers both on the surface and especially in Unotch of specimens. In the end the fractographic analysis of fracture surfaces were carried out. The notch toughness is negatively influenced as a result of presence of a nitrided layer on the surface of root of Unotch and decrease again as the thickness of nitrided layer increases and with decrease in temperature. It turned out, if the nitrided layer in root of U-notch was “sufficiently” thick, the crack spread had unstable course. The change of the character of the crack spread was also influenced by temperature.

Název v anglickém jazyce

EFFECT OF PLASMA NITRIDING ON THE NOTCH TOUGHNESS OF SPRING STEEL

Popis výsledku anglicky

Specimens made from spring steel 54SiCr6 were nitrided using various parameters of plasma nitriding in order to achieve a layer of variable thickness. The microstructure, phase constitution, hardness and case hardness depth were investigated. Subsequently notch toughness was measured by the instrumented Charpy impact test on 10x10x55 mm test specimens with U-notch 5 mm depth. Instrumented Charpy impact test was carried out at -40 °C, +21 °C and +70 °C. Results of notch toughness were correlated with the structure, chemical composition and the depth of the nitrided layers both on the surface and especially in Unotch of specimens. In the end the fractographic analysis of fracture surfaces were carried out. The notch toughness is negatively influenced as a result of presence of a nitrided layer on the surface of root of Unotch and decrease again as the thickness of nitrided layer increases and with decrease in temperature. It turned out, if the nitrided layer in root of U-notch was “sufficiently” thick, the crack spread had unstable course. The change of the character of the crack spread was also influenced by temperature.

Druh

D - Stať ve sborníku

CEP obor

KA - Vojenství

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

METAL 2016, 25th Anniversary International Conference on Metallurgy and Materials

ISBN

978-80-87294-67-3

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

1037-1044

Název nakladatele

TANGER Ltd., Keltickova 62, 710 00 Ostrava, Czech Republic, EU

Místo vydání

Ostrava, Czech Republic, EU

Místo konání akce

Brno, Czech Republic, EU

Datum konání akce

25. 5. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000391251200168