| 万建松,吕震宙,岳珠峰.单晶高温材料中铸造微孔洞的扩长[J].计算力学学报,2006,23(6):737~742 |
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| 单晶高温材料中铸造微孔洞的扩长 |
| Casting micro-porosity growth in single-crystal superalloys |
| 修订日期：2004-11-29 |
| DOI：10.7511/jslx20066138 |
| 中文关键词: 铸造微孔洞 单晶高温合金 晶体塑性本构关系 三维体胞 |
| 英文关键词:casting microporosity,single-crystal superalloys,crystallographic constitutive equation,3D unit cell |
| 基金项目:中国博士后科学基金 |
| 万建松 吕震宙 岳珠峰 |
| 西北工业大学工程力学系,西安710072 |
| 摘要点击次数: 1511 |
| 全文下载次数: 8 |
| 中文摘要: |
| 基于有限变形晶体塑性本构关系及三维体胞模型，采用有限元的方法，分析了在不同应力三维度、不同罗德参数、不同滑移系开动及不同加载取向下，单晶高温合金中铸造微孔洞扩长的力学行为。分析结果表明：累积剪切应变在铸造微孔洞的扩长中起着很重要的作用，大的累积剪切应变对应高含量的铸造微孔洞；开动滑移系族的类型对铸造微孔扩长的影响不容忽视，故准确的确定开动滑移系的类型，对于评估单晶热端部件的寿命至关重要。由于不同的取向具有不同的Schmid因子、弹性模量及开动滑移系，单晶高温合金中的铸造微孔洞的扩长还与取向密切相关，因此根据热端部件工况，合理的选择其取向是有必要的。 |
| 英文摘要: |
| Finite element(FE) analysis is employed to investigate casting micro-porosity growth in nickel-base single-crystal superalloys.Based on finite deformation rate-dependent crystallographic constitutive equation, the simulation of casting micro-porosity in three-dimensional unit cell model is carried out under variation in a range of parameters including triaxiality,Lode parameter,type of slip systems activated and Loading orientation.The FE results show that large local cumulative shear strain around casting micro-porosity plays an important role for driving casting micro-porosity growth,the high casting micro-porosity volume fraction corresponds to large cumulative shear strain.The type of slip systems activated has remarkable effect on casting micro-porosity growth,so it is very important to determine the operative slip systems for predicting the life of hot section.The growth of casting micro-porosity is related to crystallographic orientation,because different orientation is associated with different Schmid factor,the Young's modulus and slip systems activated.That is to say,according to load case of hot section,to choice a properly crystallographic orientation is necessary. |
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