The cover image illustrates the effect of microstructure on the hardness and wear properties of 45 steel after induction hardening. The formation and refinement of martensite improve the hardness and wear resistance. In this work by Lin Liu and co‐workers, article number 2000540, the mechanism of 45 steel microstructure from austenite to martensite during the induction hardening was explored.

中文翻译：

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感应淬火后显微组织对45钢硬度和磨损性能的影响

封面图像显示了显微组织对感应淬火后45钢的硬度和磨损性能的影响。马氏体的形成和细化提高了硬度和耐磨性。在Lin Liu及其同事的这项工作中（文章编号2000540），探讨了感应淬火过程中从奥氏体到马氏体的45种钢组织的机理。