Abstract
This research work examined the use of non-destructive Barkhausen noise technique in establishing residual stress (RS) depth profile in shot-peened specimens. The main objective was to produce a quantitative study of various Barkhausen noise parameters, including root-mean-square (RMS), full-width at half maximum (FWHM), peak average and pulse counts. A correlation was developed between Barkhausen noise parameters with residual stress values that were measured using X-ray diffraction technique. It was noticed that Barkhausen noise generated was highest at shallower depth of 50 μm and lowest at deeper depth of 400 μm, i.e. Barkhausen noise decreased with increasing depth for all the samples. This was attributed to the shot peening treatment being more effective on the near surface region of the material than in its bulk. After a thorough analysis of the key Barkhausen parameters, RMS was determined to produce the best correlation to RS. The depth profiles of RMS and RS were inversely proportional, and this trend was best reflected in shallower depths of 50 μm to 250 μm where the shot-peening process had greater impact on the specimens.
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Acknowledgement
This work is supported by an industry alignment fund-prepositioning programme: Advanced Post-processing and Non-Destructive Evaluation for Additive Manufacturing (IAF-PP, Grant no. A20F9a0045).
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Koh, W.Z.I., Wei, Y. (2022). Correlation Study Between Barkhausen Noise and Depth-Resolved Residual Stress Upon Shot Peening. In: Wei, Y., Chng, S. (eds) Proceedings of the 2nd International Conference on Advanced Surface Enhancement (INCASE 2021). INCASE 2021. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-5763-4_19
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DOI: https://doi.org/10.1007/978-981-16-5763-4_19
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