Monitoring of grinding burn via Barkhausen noise emission in case-hardened steel in large-bearing production

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• 作者：Miroslav Neslu&scaron ; an^a ; ^{miroslav.neslusan@fstroj.uniza.sk" class="auth_mail" title="E-mail the corresponding author} ; Jakub Č&iacute ; žek^b ; ^{jakub.cizek@mff.cuni.cz" class="auth_mail" title="E-mail the corresponding author} ; Kamil Kolař&iacute ; k^c ; ^{kamil.kolarik@email.cz" class="auth_mail" title="E-mail the corresponding author} ; Peter Miná ; rik^d ; ^{petorip@centrum.sk" class="auth_mail" title="E-mail the corresponding author} ; Má ; ria Čilliková ; ^a ; ^{maria.cillikova@fstroj.uniza.sk" class="auth_mail" title="E-mail the corresponding author} ; Oksana Melikhova^b ; ^{oksivmel@yahoo.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Barkhausen noise ; Grinding ; Case-hardening ; Microstructure ; Residual stresses
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：104-117
• 全文大小：6032 K

文摘

This paper deals with monitoring of thermally induced damage during grinding in case-hardened surfaces via magnetic Barkhausen noise (MBN) combined with other non-destructive techniques: positron annihilation spectroscopy (PAS) and X-ray diffraction (XRD). This study discusses the possible ways in which MBN signals could be calibrated as a function of microstructure expressed in terms of the heat-affected zone (HAZ) thickness, dislocation density, microhardness profile, or carbide distribution. It was found that MBN envelopes exhibit two peaks due to remarkable inhomogeneity of the carbide distribution. Resistance of carbides against elevated temperatures induced by grinding heat is employed in order to suggest the threshold MBN. It is concluded that, in the real production of large bearings for wind power stations, the MBN technique should be calibrated with respect to microstructural transformations rather than residual stress state.