Herein, the effects of addition of TiB₂–TiC nanoparticles on the microstructure and tensile properties of as-cast gray cast irons are investigated. The in situ nanosized TiB₂–TiC/Al master alloy is added in the casting process. It is found that the presence of TiB₂–TiC nanoparticles refines the graphite flakes and pearlite and increases the yield strength, tensile strength, and fracture strain simultaneously. The strengthening mechanisms are related to grain refining strengthening and Orowan strengthening. The toughening mechanism is related to the scattering behavior of cracks by nanoparticles.

中文翻译：

---

原位纳米TiB2-TiC/Al中间合金增强灰口铸铁的组织细化与强韧化机理

在此，研究了添加 TiB ₂ -TiC 纳米颗粒对铸态灰铸铁的显微组织和拉伸性能的影响。在铸造过程中添加了原位纳米级TiB ₂ -TiC/Al中间合金。发现TiB ₂ -TiC纳米粒子的存在细化了石墨片和珠光体，同时提高了屈服强度、抗拉强度和断裂应变。强化机制与晶粒细化强化和Orowan强化有关。增韧机制与纳米粒子对裂纹的散射行为有关。