单晶高温合金杂晶形成倾向性数值模拟

发布时间：2018-05-17 22:00

本文选题：液态金属冷却法 + ProCAST　；参考：《上海金属》2017年03期

【摘要】：采用液态金属冷却法(LMC)实现定向凝固,运用ProCAST有限元软件包计算了DD483高温合金的定向凝固过程。在试验验证获得合理模拟参数的基础上,模拟抽拉速度和平台尺寸对高温合金变截面试样定向凝固过程温度场的影响,并采用ProCAST中的元胞自动机(CA)与有限元(FE)耦合模块计算相应条件下的微观组织,探究拉速和平台尺寸对高温合金变截面试样平台区域杂晶形成的影响。结果表明,冷却曲线模拟结果与试验结果吻合良好;拉速越大,杂晶形成倾向越大;同样,平台尺寸越大,杂晶形成倾向也越大;试样平台尺寸越大,获得单晶的临界拉速越小。
[Abstract]:The directional solidification process of DD483 superalloy was calculated by ProCAST finite element software. On the basis of the reasonable simulation parameters obtained from the test, the effects of the drawing speed and the platform size on the temperature field during the directional solidification process of the superalloy specimens with variable cross section were simulated. The coupling module of cellular automata (CA) and finite element method (FEE) in ProCAST was used to calculate the microstructure under the corresponding conditions, and the effects of drawing speed and platform size on the formation of heterocrystals in the platform region of superalloy specimens with variable cross section were investigated. The results show that the simulation results of the cooling curve are in good agreement with the experimental results; the larger the drawing speed, the greater the tendency of heterocrystalline formation; similarly, the larger the platform size, the greater the heterocrystalline formation tendency, and the larger the specimen platform size, the larger the heterocrystalline formation tendency is. The critical drawing speed of single crystal is smaller.
【作者单位】：省部共建高品质特殊钢冶金与制备国家重点实验室上海市钢铁冶金新技术开发应用重点实验室和上海大学材料科学与工程学院;
【基金】：国家自然科学基金(No.U1560202、No.51401116、No.51404148) 上海市科委项目(No.13521101102、No.14521102900)
【分类号】：TG132.3

【相似文献】