论文部分内容阅读
通过对Fe-12.4Cr-0.13C(质量分数,%)合金在780℃分别进行10 h,100 h,200 h的时效处理,研究了合金中析出相在高温时效过程中的粗化行为。采用化学萃取、X射线衍射仪(XRD)、高分辨透射电镜(HREM)分析测定了不同时效条件下析出相的形貌与类型,并且在此基础上采用纳米粒度及电位分析仪确定其尺寸分布;同时,采用热力学与动力学计算模拟铁铬碳合金碳化物的粗化规律。结果表明,采用激光粒度仪研究碳化物平均粒度及其分布是可行的,且采用TC-DICTRA软件中的移动界面模型可较为准确地计算该碳化物的尺寸变化规律。
The roughening behavior of the precipitated phase in the alloy during aging at high temperature was studied by aging the Fe-12.4Cr-0.13C (mass fraction) alloy at 780 ℃ for 10 h, 100 h and 200 h, respectively. The morphology and type of the precipitated phase under different aging conditions were determined by chemical extraction, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HREM), and the size distribution was determined by the nano-particle size and potential analyzer At the same time, thermodynamic and kinetic calculations were used to simulate the roughening rules of Fe-Cr alloy carbides. The results show that it is feasible to study the average grain size and distribution of carbide by laser particle sizer. The moving interface model in TC-DICTRA can be used to calculate the size variation law of carbide accurately.