摘要
采用俄歇电子能谱仪(AES)研究了在520℃,40 MPa的张应力下2.25Cr-1Mo钢中磷元素的晶界偏聚行为。经检测发现磷在晶界处发生了明显的非平衡晶界偏聚现象,其临界时间为0.5 h,此时磷原子的偏聚量为14.82%(原子百分比)。根据徐庭栋的中温低张应力引起的非平衡晶界偏聚理论模型进行分析,发现张应力使磷-空位复合体的扩散系数增加了1个数量级,使磷原子的扩散系数降低了4个数量级,且俄歇试样的断口形貌与晶界磷原子的偏聚结果相一致。
The grain boundary segregation of phosphorous in 2.25Cr-1Mo steel at 520℃ and 40MPa tensile stress is studied by Auger electron spectroscopy （AES）. The phenomenon of non-equilibrium segregation of phosphorous in the grain boundary occurs obviously, and the critical time for this nonequilibrium segregation is 0.5h when the segregation concentration of phosphorus is 14.82at. %. Xu＇s model of non-equilibrium grain boundary segregation induced by intermediate temperature and low tensile stress is used to analyze the experimental results. It is found that the tensile stress raises the diffusion coefficient of phosphorous-vacancy complexes by 1 order of magnitude and reduces that of phosphorous by 4 orders of magnitude. And the fracture appearance of AES samples corresponds to the grain boundary segregation results of phosphorus.
出处
《武汉科技大学学报》
CAS
2008年第4期357-360,共4页
Journal of Wuhan University of Science and Technology
基金
国家自然科学基金重点资助项目(50331020)
关键词
磷
非平衡偏聚
张应力
扩散系数
phosphorous
non-equilibrium grain boundary segregation
tensile stress
diffusion coefficient
