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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Santa-Aho, Suvi Tuulikki
Tampere University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024Magnetic domain wall dynamics studied by in-situ lorentz microscopy with aid of custom-made Hall-effect sensor holdercitations
- 2024Synergistic effects of heat treatments and severe shot peening on residual stresses and microstructure in 316L stainless steel produced by laser powder bed fusioncitations
- 2024Magnetic behavior of steel studied by in-situ Lorentz microscopy, magnetic force microscopy and micromagnetic simulations
- 2023Magnetic Domain Structure of Ferromagnetic Steels Studied by Lorentz Microscopy and Magnetic Force Microscopy
- 2023Multi-instrumental approach to domain walls and their movement in ferromagnetic steels – Origin of Barkhausen noise studied by microscopy techniquescitations
- 2022Novel utilization of microscopy and modelling to better understand Barkhausen noise signal
- 2022Comparative study of additively manufactured and reference 316 L stainless steel samples – Effect of severe shot peening on microstructure and residual stressescitations
- 2022Surface and subsurface modification of selective laser melting built 316L stainless steel by means of severe shot peening
- 2021Additive manufactured 316l stainless-steel samplescitations
- 2021Mimicking Barkhausen noise measurement by in-situ transmission electron microscopy - effect of microstructural steel features on Barkhausen noisecitations
- 2021Motion of Domain Walls in Ferromagnetic Steel Studied by TEM – Effect of Microstructural Features
- 2020Statistical evaluation of the Barkhausen Noise Testing (BNT) for ground samples
- 2020Cracking and Failure Characteristics of Flame Cut Thick Steel Platescitations
- 2019Role of Steel Plate Thickness on the Residual Stress Formation and Cracking Behavior During Flame Cuttingcitations
- 2019Case Depth Prediction of Nitrided Samples with Barkhausen Noise Measurementcitations
- 2018Surface layer characterization of shot peened gear specimenscitations
- 2018Effect of microstructural characteristics of thick steel plates on residual stress formation and cracking during flame cuttingcitations
- 2017Characterization of Flame Cut Heavy Steelcitations
- 2016Barkhausen noise response of three different welded duplex stainless steelscitations
- 2016The Characterization of Flame Cut Heavy Steel – The Residual Profiling of Heat Affected Surface Layercitations
- 2015Modelling of Material Properties Using Frequency Domain Information from Barkhausen Noise Signalcitations
- 2012Barkhausen Noise Method for Hardened Steel Surface Characterization - The Effect of Heat Treatments, Thermal Damages and Stresses
Places of action
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thesis
Barkhausen Noise Method for Hardened Steel Surface Characterization - The Effect of Heat Treatments, Thermal Damages and Stresses
Abstract
This work concentrates on the non-destructive magnetic Barkhausen noise (BN) method. The BN method can be utilized in the detection of altered material properties such as changes in microstructure and stress. Method can be used e.g. in detection of grinding burns from hardened and ground gears. One challenge in the BN utilization is the lack of standardized quantification processes and varying guidelines for the use of the method. One of the aims of this study was to manufacture calibration samples for BN device to be used in quality control. The calibration samples must be characterized properly (microstructure, residual stress, surface condition) in order to use them. Then, the calibration samples can be used directly to verify the readings of the measurement device. In addition, these samples allow a more thorough analysis of the BN signal. The verification of the Barkhausen noise readings will give more confidence to the quality control. Two possible methods, induction heating and laser processing were studied for creation of controlled thermal damages. Laser processing was found to be more suitable method for producing these controlled thermal damages. One of the current topics of BN method development is its application to case-depth measurements of hardened components. The non-destructive detection of hardened layer thickness would be useful in detection of layer left for re-grinding and verification of case-depths of hardening heat treatments. This study presents also results of the utilization of commercial Rollscan equipment to case-depth analysis. Method presented here is based on magnetizing voltage sweeps generated from the hardened samples. Calculated slope from magnetizing voltage sweep and division of these measured slopes using varying frequencies can give information about the sample with composition gradients and microstructure gradients related to case-depth value. The relation between BN and stress is not yet well understood. This study also concentrates on this part of BN phenomenon. Here elastic stress was applied to case-hardened steel samples to examine the effect of elastic stress to BN responses. The stress sensitivity was found to be different in test bars with different hardness values obtained with tempering. The results revealed a linear behaviour of the reciprocal RMS value as a function of the applied stress. The stress sensitivity of the RMS value was noticed to depend on the surface hardness of the specimen.