PMO对M2高速钢连铸坯凝固组织及碳化物析出的影响

doi:10.12066/j.issn.1007-2861.2678

摘要/Abstract

摘要： M2高速钢连铸坯中碳化物的尺寸、分布及形貌影响着后续轧制等工艺过程,并对最终产品性能和质量有重要影响.采用连铸坯枝晶生长热模拟试验机,探究脉冲磁致振荡（pulse magneto-oscillation,PMO）凝固细晶技术对M2高速钢连铸坯中碳化物析出长大过程的影响,探讨应用PMO技术改善连铸M2高速钢碳化物的可能性及条件.实验研究表明,PMO可以细化凝固组织,0、120、240、360 K_IA峰值电流条件下,凝固末端的二次枝晶臂间距分别减小3.08、3.83、6.91μm.同时C、W、Cr元素宏观分布更为均匀.利用PMO技术可有效降低碳化物面积占比,减小碳化物网交汇处尺寸:360 K_IA时碳化物面积占比最低,240 K_IA时碳化物网交汇尺寸最小.热力学计算表明:未施加PMO时,固液界面处Mo₂C与W₂C析出固相率为0.921、0.972;施加PMO处理时,固液界面处Mo₂C与W₂C析出固相率分别为0.931、0.988,M₂C （M=Mo/W）形貌由层片状转变为蜂窝状.PMO处理一方面使凝固组织细化,元素富集减弱,另一方面使碳化物析出温度降低,两方面的作用使得碳化物更加细小.

关键词: M2高速钢, 连铸, 脉冲磁致振荡, 碳化物, 热模拟

Abstract: Regarding M2 high-speed steel continuous-cast billets,the carbide’s size,distribution,and morphology not only directly influence subsequent processes like rolling,but also exert a significant impact on the performance and quality of the final product.A thermal simulation test machine is utilized in this study for dendritic growth in continuous cast billets to explore the effect of pulse magneto-oscillation （PMO） solidification refinement technology on the carbide precipitation and growth process in M2 high-speed steel billets.The possibility and conditions for using PMO technology to improve the carbides in continuous cast M2 high-speed steel are also discussed.The thermal simulation results indicate that PMO can refine the solidification microstructure.Under peak current conditions of0,120,240,and 360 K_IA,the secondary dendrite arm spacing at the solidification end decreased by 3.08,3.83,and 6.91μm,respectively.At the same time,the macro-distribution of C,W,and Cr elements became more uniform.The thermal simulation quenching tests show that PMO technology can effectively reduce the area fraction of carbides and decrease the size of carbide network intersections.The lowest carbide area fraction was observed at360 K_IA,while the smallest carbide network intersection size was found at 240 K_IA.Thermodynamic calculations indicate that without PMO treatment,the solid-phase fraction of Mo₂C and W₂C precipitated at the solid-liquid interface was 0.921 and 0.972,respectively.With PMO treatment,the precipitated solid phase fractions of Mo₂C and W₂C at the solid-liquid interface reach 0.931 and 0.988 respectively,while the morphology of M₂C（M=Mo/W） transitions from lamellar to fibrous-like structure.On the one hand,PMO treatment refines the solidification microstructure and weakens element enrichment,and on the other hand,it lowers the carbide precipitation temperature.These two effects result in smaller carbides.

Key words: M2 high-speed steel, continuous casting, pulse magnetic-oscillation, carbides, thermal simulation

中图分类号:

TG249.7

朱守豪, 刘海宁, 徐智帅, 李志聪, 陈湘茹, 翟启杰. PMO对M2高速钢连铸坯凝固组织及碳化物析出的影响[J]. 上海大学学报(自然科学版), 2025, 31(3): 403-419.

ZHU Shouhao, LIU Haining, XU Zhishuai, LI Zhicong, CHEN Xiangru, ZHAI Qijie. The effect of PMO on the solidification microstructure and carbide precipitation of M2 high-speed steel continuous cast billets[J]. Journal of Shanghai University（Natural Science Edition）, 2025, 31(3): 403-419.

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