School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.
Sensors (Basel). 2021 Dec 12;21(24):8310. doi: 10.3390/s21248310.
Stress affects the microstructure of the material to influence the durability and service life of the components. However, the previous work of stress measurement lacks quantification of the different variations in time and spatial features of micromagnetic properties affected by stress in elastic and plastic ranges, as well as the evolution of microstructure. In this paper, microstructure evolution under stress in elastic and plastic ranges is evaluated by magnetic Barkhausen noise (MBN) transient analysis. Based on a J-A model, the duration and the intensity are the eigenvalues for MBN transient analysis to quantify transient size and number of Barkhausen events under stress. With the observation of domain wall (DW) distribution and microstructure, the correlation between material microstructure and MBN transient eigenvalues is investigated to verify the ability of material status evaluation on the microscopic scale of the method. The results show that the duration and the intensity have different change trends in elastic and plastic ranges. The eigenvalue fusion of the duration and intensity distinguishes the change in microstructure under the stress in elastic and plastic deformation. The appearance of grain boundary (GB) migration and dislocation under the stress in the plastic range makes the duration and the intensity higher on the GB than those inside the grain. Besides, the reproducibility of the proposed method is investigated by evaluating microstructure evolution for silicon steel sheet and Q235 steel sheet. The proposed method investigates the correlation between the microstructure and transient micromagnetic properties, which has the potential for stress evaluation in elastic and plastic ranges for industrial materials.
应力会影响材料的微观结构，从而影响部件的耐久性和使用寿命。然而，以前的应力测量工作缺乏对弹性和塑性范围内磁微结构特性随时间和空间变化的定量分析，也缺乏对微观结构演变的研究。本文通过磁巴克豪森噪声（MBN）瞬变分析来评估弹性和塑性范围内的微观结构演变。基于 J-A 模型，MBN 瞬变分析的持续时间和强度是特征值，可以量化在应力下的瞬变大小和巴克豪森事件的数量。通过观察畴壁（DW）分布和微观结构，研究了材料微观结构与 MBN 瞬变特征值之间的相关性，以验证该方法在微观尺度上评估材料状态的能力。结果表明，持续时间和强度在弹性和塑性范围内呈现出不同的变化趋势。持续时间和强度的特征值融合可以区分弹性和塑性变形下的微观结构变化。在塑性范围内的应力作用下，晶界（GB）迁移和位错的出现使得 GB 处的持续时间和强度高于晶粒内部。此外，通过评估硅钢板和 Q235 钢板的微观结构演变，研究了所提出方法的重现性。该方法研究了微观结构与瞬态磁微结构特性之间的相关性，为工业材料的弹性和塑性范围内的应力评估提供了潜力。
