钢中固溶稀土对过冷奥氏体转变的影响
发布时间：2018-10-08 20:39
【摘要】：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。
[Abstract]:By means of ICP-MS inductively coupled plasma mass spectrometer, JEM-2100 transmission electron microscope and L78 quenching thermal expansion instrument, the existence of solid solution rare earth elements in steel and its effect on the transformation of undercooled austenite were studied by combining with the measurement of the diffusion coefficient of La interface. The results show that rare earth has a certain amount of solid solution in steel. Trace amount of solid solution rare earth exists in grain boundary, dislocation and other crystal defects. Solid solution of rare earth elements can delay the transformation of subcooled austenite and make the CCT curve move to the lower right. The solid solution rare earth atoms are concentrated at the grain boundary, which hinders the process of diffusion or thermal activation, and delays the nucleation and growth of the new phase, which is the main reason for delaying the transformation of undercooled austenite.
【作者单位】： 内蒙古科技大学材料与冶金学院;内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室;
【基金】：国家自然科学基金资助项目(51261018) 内蒙古自然科学基金资助项目(2012MS0805) 内蒙古科技大学创新基金资助项目(2011NCL037)
【分类号】：TG142.1
[Abstract]:By means of ICP-MS inductively coupled plasma mass spectrometer, JEM-2100 transmission electron microscope and L78 quenching thermal expansion instrument, the existence of solid solution rare earth elements in steel and its effect on the transformation of undercooled austenite were studied by combining with the measurement of the diffusion coefficient of La interface. The results show that rare earth has a certain amount of solid solution in steel. Trace amount of solid solution rare earth exists in grain boundary, dislocation and other crystal defects. Solid solution of rare earth elements can delay the transformation of subcooled austenite and make the CCT curve move to the lower right. The solid solution rare earth atoms are concentrated at the grain boundary, which hinders the process of diffusion or thermal activation, and delays the nucleation and growth of the new phase, which is the main reason for delaying the transformation of undercooled austenite.
【作者单位】： 内蒙古科技大学材料与冶金学院;内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室;
【基金】：国家自然科学基金资助项目(51261018) 内蒙古自然科学基金资助项目(2012MS0805) 内蒙古科技大学创新基金资助项目(2011NCL037)
【分类号】：TG142.1
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