Limited cold formability has been a longstanding challenge for processing high-speed steels. In this study, we probe the relationship between the ductility and eutectoid carbides. The results show that larger-fractioned eutectoid carbides are formed and gradually evolve from granular M₆C to rod-shaped M₂₃C₆ with increasing annealing duration. Rod-shaped M₂₃C₆ carbides have limited shear resistance and are readily sheared by dislocations at large strains, which deteriorates work-hardening abilities and the ductility. Highly dispersive M₆C eutectoid carbides are desirable for the ductility enhancement of annealed high-speed steels.

中文翻译：

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理想的共析碳化物，可提高退火高速钢的延展性

有限的冷成形性一直是加工高速钢的长期挑战。在这项研究中，我们探讨了延性和共析碳化物之间的关系。结果表明，随着退火时间的延长，形成了较大分数的共析碳化物，并从颗粒M ₆ C逐渐演化为棒状M ₂₃ C ₆。棒状M ₂₃ C ₆碳化物具有有限的抗剪切性，并且容易在大应变下因位错而被剪切，从而降低了加工硬化能力和延展性。为了提高退火高速钢的延展性，需要高度分散的M ₆ C共析碳化物。