Morphological and Structural Study of Heat-Affected Zone Induced by Laser Cutting of Glassy Metal Tapes

Szabó, Attila; Lovas, László; Novák, Lajos; Koti, D.; Cziráki, Á.

doi:10.12693/aphyspola.137.1006

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“…The SEM figure shows a columnar microstructure within the HAZ, resembling a typical re-solidified microstructure. Furthermore, the columnar increasingly finer dispersity in the deeper region of HAZ [ 22 ]. The size of the HAZ region observed microscopically has good correspondence with micro-hardness, coercivity, and saturation magnetization [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Research on Deterioration Mechanism and High-Precision Modelling of the Core Loss for Amorphous Alloys after Wire-Cut Electric Discharge Machining

et al. 2023

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Amorphous alloys (AAs) have the advantage of low core loss. Thus, they can be used in high-speed motor applications. However, compared with the nominal performances, the performance of the wire-cut electric discharge machine (W-EDM)-processed AA iron core changes significantly, which limits its popularization. This paper focuses on the performance degradation mechanism of the AA ribbon caused by W-EDM and establishes a modified core loss model after machining. First, a 308 × 15 mm ribbon-shaped AA sample machined by W-EDM was prepared. The characterization and analysis of the magnetic properties, phase, magnetic domain, nano-indentation, micro-morphology, and composition were carried out. In this paper, by analysing the variation in the magnetic domain distribution based on domain width and nano-mechanical properties, it is proposed that the performance degradation range of AA ribbons processed by W-EDM is within 1 mm from the edge. By comparing the microscopic morphology and chemical composition changes in the affected and the unaffected area, this paper presents a mechanism for the property deterioration of W-EDM-processed AA ribbons based on electrochemical corrosion. Finally, a modified loss model for W-EDM-processed AAs is established based on the division of the affected area. This model can significantly improve the accuracy of core loss estimation in the medium- and high-frequency bands commonly used in high-speed motors.

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Section: Introductionmentioning

confidence: 99%