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采用ICP-MS电感耦合等离子质谱仪、JEM-2100透射电镜及L78淬火热膨胀仪等设备,结合对La界面扩散系数的测定,研究了固溶稀土元素在钢中的存在及对过冷奥氏体转变的影响。结果表明,稀土在钢中有一定固溶量。微量的固溶稀土存在于晶界、位错等晶体缺陷处。固溶稀土元素可推迟过冷奥氏体的转变,使CCT曲线向右下方移动。固溶稀土原子塞集于晶界等缺陷处,阻碍扩散或热激活过程,延迟了新相的形核-长大,是推迟过冷奥氏体转变的主要原因。
Using ICP-MS inductively coupled plasma mass spectrometer, JEM-2100 transmission electron microscope and L78 quenching dilatometer and other devices, combined with the determination of La interface diffusion coefficient, the existence of solid solution rare earth elements in steel and the effect on supercooled austenite The impact of change. The results show that rare earth in the steel has a certain amount of solid solution. Trace amount of solid solution rare earth exists in grain boundaries, dislocations and other crystal defects. Solute rare earth elements can postpone the transformation of subcooled austenite, the CCT curve to the lower right. Solute rare earth atomic plugs gathered in the grain boundaries and other defects, hinder the proliferation or thermal activation process, delayed the nucleation - growth of new phase is delayed the main reason for the overcooled austenite.