Numerical Simulation of Freckle Defects in Nickel based Superalloys
In order to deeply understand the formation characteristics of freckle defects in the process of directional solidification of nickelbased superalloy, three major equations of fluid mechanics were used to simulate the formation of freckles during the directional solidification of CMSX2 superalloy ba...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Harbin University of Science and Technology Publications
2020-04-01
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| Series: | Journal of Harbin University of Science and Technology |
| Subjects: | |
| Online Access: | https://hlgxb.hrbust.edu.cn/#/digest?ArticleID=1759 |
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| Summary: | In order to deeply understand the formation characteristics of freckle defects in the process of directional solidification of nickelbased superalloy, three major equations of fluid mechanics were used to simulate the formation of freckles during the directional solidification of CMSX2 superalloy based on the SIMPLE (SemiImplicit Method for Pressure Linked Equations) algorithm The simulations in the reference were used to validate the model The effects of geometric shape and alloy composition on the flow field, solid fraction field and solute segregation distribution during solidification of the casting were investigated The simulations show that freckles are easily formed in the casting with shrinkage section The Al element in the alloy composition promotes the formation of freckles, while the Ta element plays a very good role in suppressing the formation of freckles |
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| ISSN: | 1007-2683 |