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采用中频真空感应熔炼炉、X射线衍射仪、金相显微镜、电子探针、显微硬度计等实验分析方法,研究了稀土金属铈与低熔点金属锡在钢中的相互作用。结果表明,钢液中铈和锡浓度均较高的条件下,铸态试样中可析出化合物Ce3Sn7相,沿晶界分布。经奥氏体区高温退火处理,钢中的Ce3Sn7相化合为三元FeCe3Sn6相。退火状态下FeCe3Sn6相的显微硬度大于基体的显微硬度。FeCe3Sn6相在干燥器内稳定,在纯净水和酸性水溶液中不稳定。
The interaction between rare earth metal cerium and low melting point metallic tin in steel was studied by using IF induction melting furnace, X-ray diffraction, metallographic microscope, electron probe and microhardness tester. The results show that Ce3Sn7 phase can be precipitated in the as-cast sample and distributed along the grain boundaries under the high concentration of cerium and tin in the molten steel. After the austenite zone annealed at high temperature, the Ce3Sn7 phase in the steel is combined into a ternary FeCe3Sn6 phase. The microhardness of FeCe3Sn6 phase is greater than the microhardness of the matrix in the annealed state. The FeCe3Sn6 phase is stable in the desiccator and unstable in pure and acidic aqueous solutions.