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1 2007

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

Błaszwiewicz M., Ćwiek J., Zieliński A.

Advances in Materials Science

2007

Vol. 7, nr 1(11)

107-112

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.