The use of nitriding as a prevention method against hydrogen degradation of high-strength steels

• Autorzy: Błaszwiewicz M. , Ćwiek J. , Zieliński A.
• Języki publikacji: EN

Abstrakty

EN

The paper presents evaluation of susceptibility to hydrogen degradation of high-strength low-alloy steel, plasma nitrided in the atmosphere with various contents of N2 and H2. Susceptibility of 34CrAlNi7-10 steel and samples with various plasma nitrided layers have been evaluated under monotonically increasing load in 0,005 M H2SO4 solution. Slow-strain rate tensile (SSRT) test was carried out under cathodic polarisation. Elongation, reduction in area, fracture energy were chosen as measures of susceptibility to hydrogen embrittlement. Fracture modes of failed samples were examined with the use of scanning electron microscope (SEM). Under the increasing load and hydrogen generating environments plasma nitrided layers are effective barriers to hydrogen entry into a hulk of steel, and additionally increased plasticity of nitrided layers with absorbed hydrogen bas been observed.

Słowa kluczowe

EN

nitriding steel; plasma assisted nitriding; hydrogen embrittlement

• Wydawca: Politechnika Gdańska
• Czasopismo: Advances in Materials Science
• Rocznik: 2007
• Tom: Vol. 7, nr 1(11)
• Strony: 107--112
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Błaszwiewicz M.

autor

Ćwiek J.

autor

Zieliński A.

• Gdańsk University of Technology, Faculty of Mechanical Engineering, Gdańsk, Poland

Bibliografia

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• [7] Śmiałowski M.: Hydrogen in Steels, Pergamon Press, Oxford, 1962.
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• [9] Bimbaum H.K.: Mechanisms of hydrogen-related fracture of metals. Proc. Int. Conf. "Environment-Induced Cracking of Metals", National Association of Corrosion Engineers, Houston, Texas, USA, 1988, pp. 21-29.
• [10] Zakroczymski T., Lukomski N., Flis J.: The effect of plasma nitriding-base treatments on the absorption of hydrogen by iron. Corrosion Science 37 (1995) pp. 811-822.
• [11] PN-EN 10085:2003 Nitriding steels - Technical delivery conditions.
• [12] PN-EN ISO 7539-7:2000 Corrosion of metals and alloys - Stress corrosion testing - Part 7: Slow strain rate testing.
• [13] PN-EN ISO 7539-4:2000 Corrosion of metals and alloys - Stress corrosion testing - Part 4: Preparation and use of uniaxially loaded tensions specimens.