Micro-magnetic damage characterization of bent and cold forged parts

Samfaß, Lisa; Baak, Nikolas; Meya, Rickmer; Hering, Oliver; Tekkaya, A. Erman; Walther, Frank

doi:10.1007/s11740-019-00934-y

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…As the number of voids is reduced during hot flat rolling, the distortions of the induced tangential magnetic field decrease. This is reflected in lower amplitudes of the upper harmonics, especially A 3 and the subsequent harmonic distortion K. Concurrently, A 3 and K show a significant sensitivity to these microstructural changes, as also demonstrated in [31]. This way, harmonic analysis is also suitable to characterize damage.…”

Section: Micromagnetic Analysismentioning

confidence: 82%

“…The process-related damage shown by the number of voids is correlated with the Barkhausen noise parameter M max , the upper harmonic amplitude A 3, and the harmonic distortion factor K. The number of voids with a size greater than 150 µm 2 , was determined by means of cross-sectional topography analyses in [6]. In previous investigations, it was found for steel DP800 that before heat treatment, the upper harmonic amplitude A 3 is the most suitable parameter for damage characterization compared to higher harmonic amplitudes [30,31]. The evolution of the curves in Figure 5 is quasi-simultaneous, describing an appropriate correlation of the micromagnetic parameters and the damage evolution.…”

Section: Micromagnetic Analysismentioning

confidence: 99%

“…Wear and forming-induced damage on steels are features that can be also investigated by micromagnetic testing [27][28][29][30]. Harmonic analysis has so far only used in [31] for damage characterization.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Damage Evolution on Hot Flat Rolled Mild Steel Sheets by Means of Micromagnetic Parameters and Fatigue Strength Determination

et al. 2020

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In continuous casting processes, inevitable voids (damage) are generated inside the material. The subsequent forming process of hot flat rolling offers the potential of healing these defects by closing the voids and bonding the internal surfaces. In this paper, different forming conditions from hot flat rolling process were characterized with micromagnetic measurement techniques and the influence of the damage evolution on the fatigue behavior was investigated. To characterize the reduction of voids through hot flat rolling processes, nondestructive testing techniques are required. Therefore, micromagnetic measurements such as Barkhausen noise, incremental permeability, and harmonic analysis were carried out, correlated with the number of voids, and compared with each other. The influence of damage evolution of different forming conditions on the fatigue behavior was characterized based on instrumented constant amplitude and multiple amplitude (load increase) tests. A significant increase in fatigue strength due to the hot flat rolling process, which leads to a reduction in the number of voids, was observed. In addition, the fracture surfaces of the specimens were analyzed in the scanning electron microscope.

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Section: Micromagnetic Analysismentioning

confidence: 82%

Section: Micromagnetic Analysismentioning

confidence: 99%