Novel processing of Barkhausen noise signal for assessment of residual stress in surface ground components exhibiting poor magnetic response

The Barkhausen Noise Analysis (BNA) technique has been utilised to assess surface integrity of steels. But the BNA technique is not very successful in evaluating surface integrity of ground steels that exhibit poor micro-magnetic response. A new approach has been proposed for the processing of BN si...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2011-11, Vol.323 (21), p.2579-2584
Main Authors: Vashista, M., Paul, S.
Format: Article
Language:English
Subjects:
Analysing. Testing. Standards
Applied sciences
Barkhausen Noise Analysis
Bearing steels
Correlation
Exact sciences and technology
Grinding
Grounds
Integrity
Magnetic properties
Metals. Metallurgy
Noise
Residual stress
Signal processing
Steels
Stress analysis
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Summary:The Barkhausen Noise Analysis (BNA) technique has been utilised to assess surface integrity of steels. But the BNA technique is not very successful in evaluating surface integrity of ground steels that exhibit poor micro-magnetic response. A new approach has been proposed for the processing of BN signal and two newly proposed parameters, namely ‘count’ and ‘event’, have been shown to correlate linearly with the residual stress upon grinding, with judicious choice of user defined ‘threshold’, even when the micro-magnetic response of the work material is poor. In the present study, residual stress induced upon conventional plunge surface grinding of hardened bearing steel has been investigated along with unhardened bearing steel for benchmarking. Moreover, similar correlation has been established, when primarily compressive stress is induced upon high speed grinding using cBN wheel with moderately deep cut suppressing the micro-magnetic response from the ground medium carbon steel as the work material. ► The problem of work materials exhibiting poor BN response and poor Barkhausen Noise response is identified. ► A novel signal processing strategy is introduced to address the issue of poor micro-magnetic response of some ferromagnetic material. ► Potential of newly introduced BN parameters has been studied. ► These two BN parameters exhibited linear correlation with residual stress for work material with poor micro-magnetic response.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2011.05.036