中文摘要：

模拟当模特儿热并且 macrostructural 进化在 Ni 底的方向性的团结期间，在高率团结(HRS )(LMC ) 并且液体金属冷却下面的单个水晶(SX ) 汽轮机片用 ProCAST 被构造了软件，结合了 3D 细胞的自动机有限元素(咖啡馆) 模型。模型被用来调查迷路的谷物(SG ) 的趋势在平台的形成 HRS 和 LMC 技术制作的汽轮机片的区域。结果表明 LMC 技术能由弄平 concaved 等温线并且接着在让树突的结束充满的平台减轻 undercooling 禁止 SG 形成在 SG 前的 undercooled 地区成核。模拟结果与试验性的结果同意了很好，显示这些模型能被用来分析 macrostructural 进化或优化进程参数压制 SG 形成。用这些当模特儿，为没有 SG 形成，扔 SX 汽轮机片的批评退却率被决定是约 75 m 慴獧？

英文摘要：

The simulation models of the thermal and macrostructural evolutions during directional solidification of Ni-base single crystal （SX） turbine blades under high rate solidification （HRS） and liquid metal cooling （LMC） have been constructed using ProCAST software, coupled with a 3D Cellular Automaton Finite Element （CAFE） model. The models were used to investigate the tendencies of stray grain （SG） formation in the platform region of turbine blades fabricated by HRS and LMC techniques. The results reveal that the LMC technique can prohibit SG formation by smoothing the concaved isotherm and in turn alleviating the undercooling in the platform ends to let the dendrites fill up the undercooled zone before SG nucleation. The simulation results agreed well with the experimental results, indicating that these models could be used to analyze the macrostructural evolution or to optimize process parameters to suppress SG formation. Using these models, the critical withdrawal rate for casting SX turbine blades without SG formation were determined to be around 75μm·s^-1 and 100μm·s^-1 for HRS and LMC respectively, suggesting that LMC can be used as an efficient technique in fabricating SX turbine blades without any SG defect formation.