基于OpenCL并行的挡板对珠光体生长的相场法模拟

建立了耦合相场和溶质场的KKSO模型,采用OpenCL并行计算模拟了Fe-C合金共析生长过程,研究了不同形状和不同位置的挡板对层片状珠光体协同生长的影响.结果表明:GPU计算效率相对于串行CPU,最高可达88倍的加速比,并且随着模拟规模的增大,GPU的加速性能越高;挡板的存在直接影响珠光体的形貌演化,其使挡板下方的珠光体生长被限制,穿过挡板间隙的珠光体形貌发生改变;当挡板位于渗碳体和铁素体界面正上方时,挡板两侧渗碳体相合并为不规则形状,渗碳体相前沿碳原子不能满足其生长需求,停止生长,相邻铁素体合为一个相.因此挡板的存在可以控制珠光体的生长形貌.

Phase field simulation of pearlite growth based on OpenCL parallel baffle

The KKSO model coupling of phase field and solute field was established. OpenCL parallel computing was used to simulate the eutectoid growth process of Fe-C alloy, and the influence of baffles with different shapes and positions on the co-growth of lamellar pearlite was studied. The results show that GPU computing efficiency reach up to 88 times faster than that of serial CPU, and as the simulation scale increases, acceleration performance is higher; the presence of baffles directly affects the evolution of pearlite morphology that is, the growth of pearlite under the bafflewas be restricted, and the morphology of the pearlite passing through the gap of the baffle changed; when the baffle is located directly above the interface between cementite and ferrite, the cementite on both sides of the baffle merges into an irregular shape; the carbon atoms in the front of the cementite phase cannot meet its growth requirements, so that the growth stops, and adjacent ferrites merge into one phase. Therefore, the presence of the baffle can control the growth morphology of pearlite.