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Effect of high magnetic field on the microstructure evolution and mechanical properties of M50 bearing steel during tempering

机译：回火期间强磁场对M50轴承钢组织演变和力学性能的影响

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摘要

The effect of high magnetic field (12 T) on the microstructure evolution and mechanical properties during tempering of M50 bearing steel have been investigated for evaluating the application prospect of magnetic field in steels. Microstructural observation shows that the high magnetic field can obviously accelerate the decomposition of retained austenite (RA) during the moderate tempering (at 300 or 380 degrees C), which could be ascribed to the increased dislocation in RA by the magnetic field-Induced deformation of martensite. Meanwhile, the cementite precipitation is also increased by the applied high magnetic field because of the higher nucleation rate. Moreover, at higher tempering temperature of 530 degrees C, the Fe content in the precipitated carbides increases after applying high magnetic field, which is related to the different magnetization of carbides caused by various element content. Characterization of mechanical properties indicates that the tempered martensite embrittlement is significantly intensified during tempering at 380 degrees C, which is resulted from the accelerated RA decomposition and improved cementite precipitation under high magnetic field. When tempered at 530 degrees C in high magnetic field, the dislocation recovery is retarded and then the Vickers hardness and ultimate tensile strength (UTS) are thus improved by dislocation strengthening. This finding suggests the potential of high magnetic field (12 T) in optimizing the properties of M50 bearing steel during tempering (530 degrees C).
机译：为了评估磁场在钢中的应用前景，研究了高磁场（12 T）对M50轴承钢回火过程中组织演变和力学性能的影响。显微组织观察表明，强磁场可以明显促进中度回火（在300或380摄氏度）下残余奥氏体（RA）的分解，这可能归因于磁场引起的RA形变增加了RA的位错。马氏体。同时，由于较高的成核速率，外加高磁场也会增加渗碳体的析出。此外，在530℃的较高回火温度下，施加高磁场后，析出的碳化物中的Fe含量增加，这与由各种元素含量引起的碳化物的不同磁化强度有关。力学性能表征表明，回火马氏体脆化在380摄氏度回火期间显着增强，这是由于在高磁场下加速的RA分解和改善的渗碳体沉淀所致。当在强磁场中在530摄氏度下回火时，位错恢复受阻，然后通过位错强化提高了维氏硬度和极限抗拉强度（UTS）。这一发现表明在优化回火期间（530摄氏度）M50轴承钢的性能，强磁场（12 T）的潜力。

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