文档介绍：国内图书分类号:TG249: 学校代码:10213 国际图书分类号:669 密级:公开工学硕士学位论文高温合金点阵夹芯板低压熔模铸造数值模拟硕士研究生:董多导 师:王宏伟副教授申请学位:工学硕士学科:材料加工工程所在单位:材料科学与工程学院答辩日期:2009年6月授予学位单位:哈尔滨工业大学 Classified Index: TG249: : 669 Dissertation for the Master Degree in Engineering NUMERICAL SIMULATION OF THE TRUSS CORE PANELS IN INVESTMENT AND LOW PRESSURE DIE CASTING Candidate:Dong DuoSupervisor:Associate Prof. Wang HongweiAcademic Degree Applied for:Master of EngineeringSpeciality:Materials Processing EngineeringAffiliation:School of Materials Sci.& Eng. Date of Defence:June, 2009Degree-Conferring-Institution:Harbin Institute of Technology哈尔滨工业大学工学硕士学位论文I 摘要本文以3D-Kagome点阵夹芯板为研究对象,采用Anycasting铸造模拟软件对点阵夹芯板的低压熔模铸造过程进行了数值模拟,研究了浇注系统及主要的铸造工艺参数对高温合金点阵夹芯板成形的影响,并在此基础上进行了工艺优化。对Inc718镍基高温合金点阵夹芯板充型及凝固过程进行了数值模拟,获得了金属液充型过程中的流动状态和凝固过程中的冷却速率;采用RMM判据进行缺陷预测,指出点阵夹芯板中间的芯体杆件部位容易形成缩松、缩孔缺陷。采用不同立缝厚度的浇注系统进行充型过程模拟,结果表明,增加垂直缝隙式浇道的厚度有利于金属液平稳充型,减少铸造缺陷。高温合金点阵夹芯板充型温度场和缺陷预测模拟结果表明,在型壳预热温度保持900℃不变的条件下,随着浇注温度的提高,金属液的充型能力增加,缺陷减少,但当温度超过1460℃时,缩松、缩孔缺陷有增加的趋势;在浇注温度为1460℃不变的条件下,随着型壳预热温度的提高,铸件成形性提高,但产生缩松、缩孔缺陷的概率也增大。高温合金点阵夹芯板优化的浇注工艺为:浇注温度1480℃,型壳预热温度900~910℃,充型速度40mm/s。以铝合金为材质,对点阵夹芯板进行了低压熔模铸造浇注实验,结果表明,对陶瓷型壳进行适当的预热有利于点阵夹芯板的低压铸造成形。针对本文采用的点阵夹芯板,铝合金液的浇注温度为740℃、型壳预热温度为 250℃、保压时间为 200s时可保证点阵夹芯板完整成形。关键词:点阵夹芯板;高温合金;数值模拟;工艺优化;低压铸造哈尔滨工业大学工学硕士学位论文 IIAbstract Sandwich structure with 3D-Kagome truss core is chosen as the test casting and its casting process in investment and under low pressure casting is simulated by the software of Anycasting. The effects of the gating systems and the parameters to the truss core panels figuration were researched by the simulation. Based on the simulation results, optimize the casting process of the truss core panels. The filling and solidification process of the truss core panels of Ni-based supperalloy have been simulated, concequently the state of the molten metal during filling and the cooling rate during its solidification was obtained. In addition