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| Casting micro-porosity growth in single-crystal superalloys |
| Revised:November 29, 2004 |
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| DOI：10.7511/jslx20066138 |
| KeyWord:casting microporosity,single-crystal superalloys,crystallographic constitutive equation,3D unit cell |
| WAN Jian-song LU Zhen-zhou YUE Zhu-feng |
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| Abstract: |
| 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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