Technology Tech Breakthrough Positive

3.1% Nano-Carbides Boost 3D-Printed Tool Steel Hardness to 921 HV

2026-05-03 · Impact score: 34

UK researchers employed synchrotron X-ray and neutron techniques to systematically study the tempering behavior of additively manufactured S390 high-speed steel. This high-alloy tool steel offers 1.5 times longer lifespan and over 20% higher cutting speeds in precision manufacturing compared to conventional grades. The study found that metastable M2C carbides dissolve during austenitization, while stable MC and M6C carbides coarsen by about 60 nm after just 2 minutes of tempering. The austenite lattice parameter decreases from 3.618 to 3.608 Å within the first 10 minutes of tempering, indicating matrix carbon depletion associated with secondary carbide formation. Small-angle scattering confirmed the presence of nanoscale precipitates with a volume fraction of 3.1% after 60 minutes of tempering, yielding a peak hardness of 921 HV. This research reveals the critical role of nano-carbides in strengthening 3D-printed tool steel, provides key insights for optimizing post-processing of high-performance mold steels, and holds guiding significance for advancing the commercialization of additively manufactured high-alloy steels.

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3.1%纳米碳化物使3D打印工具钢硬度达921HV

英国研究人员利用同步辐射X射线和中子技术，系统研究了增材制造S390高速钢的回火行为。该高合金工具钢在精密制造中寿命比传统牌号长1.5倍、切削速度高20%以上。研究发现，亚稳态M2C碳化物在奥氏体化过程中溶解，而稳定MC和M6C碳化物回火仅2分钟即粗化约60纳米。奥氏体晶格参数在回火前10分钟从3.618降至3.608埃，表明基体碳耗尽与二次碳化物形成相关。小角散射证实，回火60分钟后出现体积分数3.1%的纳米级析出物，使硬度峰值达到921 HV。该研究揭示了纳米碳化物对3D打印工具钢强化的关键作用，为高性能模具钢的后处理工艺优化提供了重要依据，对推动增材制造高合金钢商业化具有指导意义。

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