Micromagnetic approaches for microstructure analysis and capability assessment

Baak, Nikolas; Hajavifard, Ramin; Lücker, Lukas; Vasquez, Julian Rozo; Strodick, Simon; Teschke, Mirko; Walther, Frank

doi:10.1016/j.matchar.2021.111189

Cited by 16 publications

(3 citation statements)

References 30 publications

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“…3MA was used for the NDT experiments to extract MBN and MIP signals [ 10 , 11 , 12 , 13 , 14 ]. The excitation coil (4, Figure 3 ) is wound on a U-shaped yoke (5, Figure 3 ).…”

Section: Methodsmentioning

confidence: 99%

“…Tetsuya Uchimoto evaluated the creep-induced microstructural changes in 12Cr-Mo-V-W microstructure under different creep test conditions by using the MIP method [ 8 , 9 ]. G. Dobmann et al [ 10 , 11 , 12 , 13 , 14 ] detected the incremental permeability of the material based on hysteresis loops using eddy current coils and proposed a semi-analytical modeling method, and fused the MIP with MBN and other detection techniques to create the 3MA detection method. MIP and MBN can be used to characterize the stress and microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Stress and Microstructures Characterization Based on Magnetic Incremental Permeability and Magnetic Barkhausen Noise Techniques

Sheng,

Wang,

Yang

et al. 2024

Materials

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Both microstructure and stress affect the structure and kinematic properties of magnetic domains. In fact, microstructural and stress variations often coexist. However, the coupling of microstructure and stress on magnetic domains is seldom considered in the evaluation of microstructural characteristics. In this investigation, Magnetic incremental permeability (MIP) and magnetic Barkhausen noise (MBN) techniques are used to study the coupling effect of characteristic microstructure and stress on the reversible and irreversible motions of magnetic domains, and the quantitative relationship between microstructure and magnetic domain characteristics is established. Considering the coupling effect of microstructure and stress on magnetic domains, a patterned characterization method of microstructure and stress is innovatively proposed. Pattern recognition based on the Multi-layer Perceptron (MLP) model is realized for microstructure and stress with an accuracy rate higher than 97%. The results show that the pattern recognition accuracy of magnetic domain features and micro-magnetic features simultaneously as input parameters is higher than that of micro-magnetic features alone as input parameters.

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“…3MA was used for the NDT experiments to extract MBN and MIP signals [ 10 , 11 , 12 , 13 , 14 ]. The excitation coil (4, Figure 3 ) is wound on a U-shaped yoke (5, Figure 3 ).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stress and Microstructures Characterization Based on Magnetic Incremental Permeability and Magnetic Barkhausen Noise Techniques

Sheng,

Wang,

Yang

et al. 2024

Materials

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“…Another possibility would be to determine the optimal time of removal as a function of the austenite content by integrating micromagnetic sensors which enable an in situ measurement. [59,60]…”

Section: Mechanical Properties Of Press-hardened Componentsmentioning

confidence: 99%

Influence of Press‐Hardening in Combination with Quenching and Partitioning Treatment on the Microstructure of Medium Manganese Steel

Blankart

Emmrich

Bähren

et al. 2023

steel research int.

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Press‐hardening of manganese–boron steels is one of the most efficient production processes for high‐strength automotive components. However, the residual formability of these sheet components is greatly limited by the formation of fully martensitic microstructure. Herein, to extend the application of press‐hardened components also to impact energy‐absorptive parts of the vehicle body, the potential of press‐hardening of a medium manganese steel in combination with a quenching and partitioning (Q&P) treatment is analyzed. Therefore, selected heat treatments from prior dilatometer investigations are reproduced in a laboratory‐scale press‐hardening system equipped with a heated hat‐shaped tool. Instead of a complete martensitic microstructure, the Q&P process leads to a multiphase microstructure consisting of fresh and tempered martensite as well as retained austenite with different carbon content each. Since depending on the phase fractions also strongly different mechanical properties are expected, not only the qualitative distinction but also the quantitative determination of the martensitic phases is of extraordinary importance. Herein, it is shown that using phase maps combined with grain‐average band slope of electron backscatter diffraction measurements is a suitable method to distinguish quantitatively fresh and tempered martensite. Validation of the differentiation method is performed using electron‐probe microanalysis.

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Barkhausen Noise‐ and Eddy Current‐Based Measurements for Online Detection of Deformation‐Induced Martensite During Flow Forming of Metastable Austenitic Steel AISI 304L

Rozo Vasquez,

Kanagarajah,

Arian

et al. 2024

Engineering Reports

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This paper deals with micromagnetic measurements for online detection of strain‐induced α′‐martensite during plastic deformation of metastable austenitic steel AISI 304L. The operating principles of the sensors are magnetic Barkhausen noise (MBN) and eddy currents (EC), which are suitable for detection of microstructure evolution due to formation of ferromagnetic phases. The focus of this study was put on the qualification of different micromagnetic techniques and different measurement systems under conditions similar to the real ones during production, which is crucial for implementation of a property‐controlled flow forming process. The investigation was carried out on tubular specimens produced by flow forming, which have different content of α′‐martensite. To characterize the sensitivity of the sensors, different contact conditions between sensors and workpieces were reproduced. MBN sensors are suitable for detecting amount of α′‐martensite, but the measurements are affected by the surface roughness. This entails that the calibration models for MBN sensors must take account of these effects. EC sensors show a closer match with the amount of α′‐martensite without having major affectation by other effects.

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Micromagnetic approaches for microstructure analysis and capability assessment

Cited by 16 publications

References 30 publications

Stress and Microstructures Characterization Based on Magnetic Incremental Permeability and Magnetic Barkhausen Noise Techniques

Stress and Microstructures Characterization Based on Magnetic Incremental Permeability and Magnetic Barkhausen Noise Techniques

Influence of Press‐Hardening in Combination with Quenching and Partitioning Treatment on the Microstructure of Medium Manganese Steel

Barkhausen Noise‐ and Eddy Current‐Based Measurements for Online Detection of Deformation‐Induced Martensite During Flow Forming of Metastable Austenitic Steel AISI 304L

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