TiC颗粒增强低合金铁素体钢的耐磨性能

Wear resistance of TiC particle reinforced low alloy ferritic wear-resistant steel

通过与传统低合金铁素体钢做对比,研究了原位合成方法制备的1. 0vol%Ti C颗粒增强型铁素体耐磨钢的磨粒磨损性能。采用光学显微镜(OM)、扫描电镜(SEM)及能谱分析(EDS)对试验钢的显微组织形貌和析出相粒子分布进行了分析,并对试验钢的硬度、强度、韧塑性和磨粒磨损性能进行测试。试验结果表明:经过轧制后的Ti C粒子在试验钢中分布均匀,其中纳米Ti C粒子产生明显的沉淀强化作用,提高了基体的强度和硬度,并保证了良好的弯曲性能。粒径1~5μm的Ti C颗粒有效阻碍了磨粒对基体的犁削作用,提高了基体抵抗磨粒磨损的能力,Ti C增强后的铁素体试验钢磨损量仅为未增强铁素体钢的60%,与未增强铁素体钢淬火+低温回火处理后的耐磨性相当。Ti C颗粒增强铁素体钢的磨粒磨损机制既包括犁皱塑性变形机制又包括显微切削机制,钢的耐磨性提高为纳米、微米Ti C粒子共同作用的结果。

Compared with the traditional low alloy ferritic steel,the abrasive wear resistance of 1. 0 vol% Ti C particle-reinforced ferritic wear resistant steel prepared by in situ synthesis technique was studied. OM,SEM and EDS were used to analyze the microstructure morphology and distribution of precipitated particles in the tested steel,and the mechanical properties and wear resistance of the tested steel were analyzed and tested. The results show that the rolled Ti C particles are evenly distributed in the tested steel. Nano-TiC particles have obvious precipitation strengthening effect,which improves the strength and hardness of the matrix and ensures good bending properties. Ti C particles with size of 1-5 μm effectively hinder the plough-grinding effect of abrasive particles and improve the abrasive wear resistance. The wear weight loss of Ti C-reinforced ferritic tested steel is only 60% of that of non-reinforced ferritic steel,which is equivalent with the wear resistance of unreinforced ferritic steel after quenching and tempering. The abrasive wear mechanism of Ti C-reinforced ferritic tested steel includes both plow type abrasive wear and micro-cutting mechanism,which means that the improvement of wear resistance of the steel can be attributed to the combined action of nano-TiC and micro-TiC particles.