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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 549 - 559 (11page)
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The eff ect of the time-dependent pinning pressure of precipitates on abnormal grain growth has been investigated by multiphasefi eld simulation with a simple precipitation model. The application of constant pinning pressure is problematicbecause it always induces abnormal grain growth or no grain growth, which is not reasonable considering the real situation. To produce time-dependent pinning pressure, both precipitation kinetics and precipitate coarsening kinetics have been consideredwith two rates: slow and fast. The results show that abnormal grain growth is suppressed at the slow precipitationrate. At the slow precipitation rate, the overall grain growth caused by the low pinning pressure in the early stage indeedplays a role in preventing abnormal grain growth by reducing the mobility advantage of abnormal grains. In addition, thefast precipitate coarsening rate tends to more quickly transform abnormal grain growth into normal grain growth by inducingthe active growth of grains adjacent to the abnormal grains in the early stage. Therefore, the present study demonstratesthat the time dependence of the pinning pressure of precipitates is a critical factor that determines the grain growth mode.
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