钛含量对高铬铸铁耐磨性能的影响

Effect of Titanium Content on Wear Resistance of High Chromium Cast Iron

研究了含0.1%、0.6%、1.1%、1.6%钛的高铬铸铁的硬度和耐磨性能与组织之间的关系。通过金相组织图、XRD测试、EDS分析以及磨损试验,发现钛的添加对高铬铸铁的耐磨性能有显著影响,形成的TiC对(Cr,Fe)7C3碳化物有明显的细化作用,但是过多的钛会导致TiC团聚并减少基体组织中的含碳量,对高铬铸铁的耐磨性能造成负面影响。当钛含量为1.6%时,高铬铸铁硬度达到HRC 63,有着最佳的耐磨损性能,其热处理工艺为1 020℃保温2h,油淬,再经250℃保温4 h,空冷。

The relationships between the hardness, wear resistance and microstructure of high chromium cast irons with 0.1%, 0.6%, 1.1%, 1.6% titanium content were studied. Based on metallographic structure diagram, XRD test, EDS analysis and wear experiment, it was found that the addition of titanium has a significant effect on the wear resistance of high chromium cast iron, and the formed TiC has a significant refinement effect on(Cr, Fe)7C3 carbide. However, too much titanium will cause TiC to agglomerate and reduce the carbon content in the matrix structure, which will negatively affect the wear resistance of high-chromium cast iron. When high chromium cast iron containing titanium 1.6% was heat treated at 1 020 ℃ for 2 h, oil quenching, then tempering at 250 ℃ for 4 h, air cooling, its hardness was HRC 63 and the wear resistance was optimal.