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采用SEM与EDS对试样进行组织与成分分析,利用氧化增重法测定了不同钒含量(3.30%、6.80%、9.08%)的含钒中铬白口铸铁在500℃、600℃和750℃下的恒温氧化动力学曲线,采用X射线衍射法(XRD)对氧化试样的表面和氧化产物进行了物相分析。结果表明:随着V含量的增加,中铬白口铸铁的组织得到细化,基体上弥散分布大量VC颗粒,使得该材料有潜在的良好耐磨性能;在较低温度下(500℃、600℃)下,含钒中铬白口铸铁的恒温氧化动力学曲线符合抛物线规律,而在较高温度下(750℃),符合直线规律,最终高温氧化产物为Fe2O3以及少量的FeCr(VO4)2和Cr2O3,随着钒含量的增高,在较高温度下(750℃),含钒中铬白口铸铁的抗氧化性能有所改善。
The microstructure and composition of the samples were analyzed by SEM and EDS. The vanadium-containing chromium white cast iron with different vanadium content (3.30%, 6.80%, 9.08%) was determined by the method of oxidation weight increase at 500 ℃, 600 ℃ and 750 ℃ Under the constant temperature oxidation kinetics curve, the surface of the oxidized sample and the oxidation products were analyzed by X-ray diffraction (XRD). The results show that with the increase of V content, the microstructure of medium chromium white cast iron is refined and a large number of VC particles are dispersedly distributed on the matrix, which makes the material have potential good wear resistance. At lower temperature (500 ℃, 600 ℃), the kinetic curves of isothermal oxidation of vanadium-bearing medium-chromium white cast iron conform to the parabolic law, while at higher temperature (750 ℃), the linear rule is consistent with the final high temperature oxidation products of Fe2O3 and a small amount of FeCr (VO4) 2 And Cr2O3, with the increase of vanadium content, the oxidation resistance of vanadium-containing chromium white cast iron has been improved at higher temperature (750 ℃).