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利用Al-Ti-B4C体系通过燃烧合成辅助铸造法成功制备了TiC-TiB2颗粒局部增强钢基复合材料,研究了Al含量对局部增强复合材料的组织及耐磨性的影响.结果表明,不同Al含量(0~50%,质量分数)的Al-Ti-B4C压坯在约1873 K钢液浇注下都能原位反应生成TiC和TiB2陶瓷颗粒,而且钢液都向预制块发生了不同程度的浸渗.压坯内Al含量的变化不仅影响了合成产物的相组成及陶瓷相的分布、尺寸和数量,而且还影响了局部增强区和钢基体界面处陶瓷颗粒的分布状况.随Al含量的增加,合成陶瓷的颗粒大小、数量以及颗粒间的孔隙均变小,产物中形成的金属间化合物的种类和数量增多,且陶瓷颗粒在界面处的梯度分布趋势减弱并最终消失.磨损测试结果表明,复合材料局部增强区的耐磨损性比钢基体显著提高,而且在Al含量为0时为最好,然后依次为含30%Al,10%Al和50%Al的复合材料.
The Al-Ti-B4C system was used to successfully prepare the TiC-TiB2 partially reinforced steel matrix composites by combustion synthesis assisted casting method and the effect of Al content on the microstructure and wear resistance of partially reinforced composites was investigated. The content of Al-Ti-B4C compacts (0 ~ 50%, mass fraction) can react in-situ to form TiC and TiB2 ceramic particles under about 1873 K molten steel pouring, Infiltration.The change of Al content in the compact not only affected the phase composition and the distribution, size and quantity of the ceramic phase, but also affected the distribution of the ceramic particles at the interface between the local reinforced zone and the steel matrix. The size and number of the synthesized ceramic particles and the pores between the particles become smaller, the type and amount of the intermetallic compounds formed in the product increase, and the gradient distribution of the ceramic particles at the interface weakens and eventually disappears.The results of the wear test , The wear resistance of the local reinforced region of the composite material is significantly higher than that of the steel substrate, and is the best when the Al content is 0, followed by the composite material containing 30% Al, 10% Al and 50% Al.