采用模铸、连铸两种工艺工业化试制一种TiC颗粒强化型马氏体耐磨钢,分析了TiC颗粒的析出规律,对比研究了试验钢与传统马氏体耐磨钢的组织、力学性能及耐磨性能.试验结果表明:凝固速度越大,TiC析出相越细;轧制压缩比越大,颗粒分布越均匀;TiC颗粒强化马氏体钢强度与传统马氏体钢相当,韧性有所降低;微米级的TiC可以有效提高材料的磨粒磨损性能,试验钢磨损失重仅为同等硬度传统马氏体钢的70％;耐磨性能的提高主要是因为在磨粒磨损条件下,微米级TiC硬质点可以破碎磨砺、钝化尖角、阻断磨痕.
TiC particle reinforced martensite wear-resistant steels with a hardness of HB450 were fabricated by mold casting and continuous casting processes.The principal of precipitation of TiC in experimental steels was studied.The microstructures and mechanical and wear-resistant properties of obtained steel were analyzed and compared with that of traditional martensite wear-resistant steels.It is found out that a higher solidification rate of continuous casting resulted in finer micron-sized TiC precipitates.In addition,a larger deformation ratio resulted in a more homogeneous distribution of TiC particles.Uniformly distributed micron-sized TiC particles could passivate the tip of the grains and stop scratches,which improved the wear resistant property of steels significantly,and reduced the weight loss to 70％ compared with the traditional martensite wear resistant steels.
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