【摘要】 本工作以TiCN_p和20Cr高铬铸铁粉末为原料，采用压制和超固相液相烧结（SLPS）工艺，制备含10%～30%（质量分数，下同）TiCN_p的高铬铸铁复合材料，系统研究了增强相含量和烧结温度对复合材料致密化行为、显微组织、物相组成和力学性能的影响规律。研究结果表明，通过真空液相烧结可以制备出相对致密度均达到97.5%以上的各成分复合材料，物相主要由TiCN、Cr₇C₃碳化物、马氏体和少量奥氏体组成；随着增强相添加量逐步增加，TiCN_p沿晶界分布，逐渐形成网状分布结构，而Cr₇C₃越来越多地在烧结过程中没有熔化的合金基体中析出和粗化；这使得复合材料的硬度线性上升，而抗弯强度和冲击韧性则降低。当TiCN_p添加量为30%时复合材料的力学性能可以达到硬度87.8HRA,抗弯强度1 304 MPa,冲击韧性2.35 J/cm²。更多还原

【Abstract】 Taking TiCN_p and 20Cr high chromium cast iron powder as raw materials, reinforced high chromium cast iron with 10wt%—30wt% TiCN_p in this work was fabricated by supersolidus liquid phase sintering（SLPS） method. The influence of TiCN_p addition amount and sintering temperature on its densification, constituent phase, microstructure and mechanical properties have been investigated systematically. The results show that the relative density of the TiCN_p sintered through SLPS technique could reach to 97.5%, and it’s phase composition containing TiCN, Cr₇C₃ carbides, martensite and a small amount of austenite. Besides, with the increment of TiCN_p addition amount, TiCN_p gradually forming a net distribution along the grain boundary. Meanwhile, more and more Cr₇C₃ carbides were precipitated and coarsened in the unmelted alloy matrix, which could lead to the linearly increment of the hardness of the TiCN_P but decreases their bending strength and impact toughness. And in general it is worth noting that the sintered composite with 30wt% TiCN_p has great mechanical properties with hardness of 87.8HRA, bending strength of 1 304 MPa and impact toughness of 2.35 J/cm².更多还原