CAJ | 학술논문

【目的】第二相颗粒的存在能影响晶粒的长大，提高材料的力学性能，因而我们用计算机模拟了含第二相颗粒的镍基合金材料在再结晶后的定向退火过程中的柱状晶生长。【方法】在相场法的基础上引入一个温度控制晶界运动的二维平面退火模型，使用该模型对含第二相颗粒的样品进行定向退火处理，观察退火过程中组织形貌的变化，并从第二相颗粒的含量和位置两个方面来讨论退火过程中第二相颗粒对柱状晶组织生长的影响，通过对柱状晶长宽比的统计来反应这些变化。【结果】定向退火处理可产生柱状晶结构；弥散分布的第二相颗粒的存在不利于柱状晶生长，并且含量越高柱状晶越粗，长宽比越小。【结论】第二相颗粒位置可以改变柱状晶晶界的形成方向，间距可以影响长宽比的大小，颗粒间的横向间距和纵向间距都存在一个临界值使柱状晶的长宽比最大。
【목적】제이상과립적존재능영향정립적장대，제고재료적역학성능，인이아문용계산궤모의료함제이상과립적얼기합금재료재재결정후적정향퇴화과정중적주상정생장。【방법】재상장법적기출상인입일개온도공제정계운동적이유평면퇴화모형，사용해모형대함제이상과립적양품진행정향퇴화처리，관찰퇴화과정중조직형모적변화，병종제이상과립적함량화위치량개방면래토론퇴화과정중제이상과립대주상정조직생장적영향，통과대주상정장관비적통계래반응저사변화。【결과】정향퇴화처리가산생주상정결구；미산분포적제이상과립적존재불리우주상정생장，병차함량월고주상정월조，장관비월소。【결론】제이상과립위치가이개변주상정정계적형성방향，간거가이영향장관비적대소，과립간적횡향간거화종향간거도존재일개림계치사주상정적장관비최대。
[Objective]The second particle has effect on the grain growth.In order to improve the mechanical properties of materials,we use computer to simulate the growth of the direction co-lumnar of Ni-based alloy in the process of annealing after recrystallizing.[Methods]Based on the phase field method,a two-dimensional annealing model for temperature controlled grain boundary motion is introduced to treat the samples with the second phase particles,and the changes of microstructure were observed.The effect of second phase particles on the growth of columnar crystal structure was discussed from two aspects:The content and the position of the second phase particles,and counting the aspect ratio to reflect the change of the columnar crys-tals.[Results]The directional annealing process can produce columnar crystal structure.Second phase particles of dispersion distribution are not conducive to the growth of columnar crystals, and the higher the content,the more the columnar crystal,the smaller the aspect ratio.[Conclusion]The position of second phase parti-cles can change the columnar crystal formation direction,and there is a critical value in the hori-zontal and vertical spacing between the parti-cles,which guarantees the aspect ratio of colum-nar crystals to reach the largest.