Evaluation of a nitrided case depth by the magnetic Barkhausen Noise

0480064 - FZÚ 2018 RIV US eng J - Journal Article
Stupakov, Alexandr - Farda, R. - Neslušan, M. - Perevertov, Alexej - Uchimoto, T.
Evaluation of a nitrided case depth by the magnetic Barkhausen Noise.
Journal of Nondestructive Evaluation. Roč. 36, Oct (2017), s. 1-9, č. článku 73. ISSN 0195-9298. E-ISSN 1573-4862
R&D Projects: GA ČR GB14-36566G; GA MŠMT LM2015088
Institutional support: RVO:68378271
Keywords : Barkhausen noise * plasma nitridation * casehardening steel * surface field control * magneto-acoustic emission
OECD category: Electrical and electronic engineering
Impact factor: 1.690, year: 2017

Applicability of magnetic methods for non-destructive evaluation of plasma nitrided cases was investigated comprehensively. Nitrided layers of 60–800 μm thicknesses were produced on a 16MnCr5 steel surface varying the plasma temperature, the nitriding time and atmosphere. Low-frequency Barkhausen noise was measured by a unique laboratory system to obtain physically grounded data. The laboratory measurements were performed at the triangular waveforms of the magnetizing voltage and the surface magnetic field. A typical rms envelope with a single peak positioned near the hysteresis coercive field was obtained for the unnitrided homogeneous sample. All nitrided samples with the hardened surface layer demonstrated an additional envelope peak at higher fields. Deeper nitridation suppressed both envelope peaks equally making the classical rms parameter sensitive to variation of the nitrided case depth.

Permanent Link: http://hdl.handle.net/11104/0275999