Ferromagnetic material is widely used in various industrial fields as it good mechanical properties.Because the working environment and the load are complex, ferromagnetic material component often produce stress concentration and micro-cracks. Metal magnetic memory detection technology is widely concerned because it can accurately detect the stress concentration, micro-cracks of components and effectively prevent the early fatigue damage of ferromagnetic materials. However, the development time of metal magnetic memory detection technology is relatively short, and the quantitative detection of stress concentration and micro-defects cannot be achieved. In order to achieve the quantitative detection of metal magnetic memory detection technology, scholars have studied on the magnetic memory characteristics, magnetic memory detection mechanism and detection methods presented in the detection of material fatigue damage. At present, reference has discovered a phenomenon that the magnetic field strength and the magnetic field gradient have been changed in the stress concentration of ferromagnetic materials and the defect parts. For the detection mechanism of magnetic memory, the main mechanisms included own leakage magnetic field, principle of minimum energy, equivalent magnetic field and micro-magnetization are put forward from the researchers. The initial detection method mainly uses the magnetic field normal component to cross zero, and the tangential component has the maximum value, but this method is prone to misjudgment. Afterwards, the researchers use magnetic field gradients, two-dimensional detection and other methods to make judgments, which greatly improved the accuracy of detection. This article summarizes the research progress of metal magnetic memory fatigue damage detection. The magnetic memory characteristics of fatigue damage of ferromagnetic materials, the mechanism of metal magnetic memory detection, and the method of metal magnetic memory detection are introduced.The problems faced by the metal magnetic memory fatigue damage detection technology are analyzed, and its prospects are prospected. It is expected to provide a reference for the quantitative detection of metal magnetic memory fatigue damage. © 2021, Materials Review Magazine. All right reserved.
