Enhanced Grain Refinement of W18Cr4V High-Speed Steel Using in Situ TiN−Nb−Cr@Graphene/Fe Nanocomposite Inoculant,Steel Research International

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Enhanced Grain Refinement of W18Cr4V High-Speed Steel Using in Situ TiN−Nb−Cr@Graphene/Fe Nanocomposite Inoculant
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-16 , DOI: 10.1002/srin.202100094
Lina Bai _{1,

2} , Chunxiang Cui ₁ , Jianjun Zhang ₁ , Lichen Zhao ₁ , Guixing Zheng ₂ , Sen Cui ₁

Affiliation

Traditional cast W18Cr4V high-speed steel (HSS) undergoes elemental segregation during solidification, which deteriorates its macroscopic mechanical properties. Previous reports have demonstrated that grain refinement overcomes this issue. Therefore, herein, the effect of an Fe-based nanocomposite inoculant on carbide dispersion is investigated. The inoculant comprises graphene-coated ceramic particles prepared in situ via mechanical grinding in a ball grinder, where material thermodynamics are considered. The microstructure of the inoculated W18Cr4V HSS is analyzed using transition electron microscopy, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. The orientation relationship among the phases is

{(200)}_{NbC} // {(1 \bar{1} \bar{1})}_{{Fe}_{3} W_{3} C} // {(00 \bar{2})}_{{Fe}_{3} C}

. The nanocomposite ceramic particles serve as a base for the heterogeneous nucleation of Fe₃W₃C and Fe₃C, thereby increasing the nonuniform nucleation rate for enhanced grain refinement. This behavior plays a crucial role in the intragranular reinforcement of HSS.

中文翻译：

原位TiN−Nb−Cr@石墨烯/Fe纳米复合孕育剂增强W18Cr4V高速钢晶粒细化

传统的铸造 W18Cr4V 高速钢（HSS）在凝固过程中会发生元素偏析，使其宏观力学性能变差。先前的报告表明，晶粒细化克服了这个问题。因此，本文研究了铁基纳米复合孕育剂对碳化物分散的影响。孕育剂包括通过在球磨机中机械研磨原位制备的石墨烯涂层陶瓷颗粒，其中考虑了材料热力学。使用跃迁电子显微镜、扫描电子显微镜、能量色散光谱和 X 射线衍射分析接种的 W18Cr4V HSS 的微观结构。相间的取向关系为