Influence of High Temperature Pre-Deformation on the Dissolution Rate of Delta Ferrites in Martensitic Heat-Resistant Steels

Junru Li; Jianjun Liu; Bo Jiang; Chaolei Zhang; Yazheng Liu

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자료유형: 학술저널

저자정보: Junru Li (University of Science and Technology Beijing) Jianjun Liu (University of Science and Technology Beijing) Bo Jiang (University of Science and Technology Beijing) Chaolei Zhang (University of Science and Technology Beijing) Yazheng Liu (University of Science and Technology Beijing)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.23 No.2

발행연도: 2017.1

수록면: 239 - 245 (7page)

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The dissolution process of delta ferrites and the influence of high temperature pre-deformation on the dissolutionrate of delta ferrites in martensitic heat-resistant steel 10Cr12Ni3Mo2VN were studied by isothermalheating and thermal simulation experiments. The precipitation temperature of delta ferrites in experimentalsteel is about 1195 °C. M23C6-type carbides incline to precipitate and coarsen at the boundaries of delta ferritesbelow 930 °C, and can be rapidly dissolved by heating at 1180 °C. The percentage of delta ferrites graduallydecreases with heating time. And a Kolmogorov-Johnson-Mehl-Avrami equation was established to describethe dissolution process of delta ferrites at 1180 °C. High temperature pre-deformation can markedly increasethe dissolution rate of delta ferrites. Pre-deformation can largely increase the interface area between delta ferriteand matrix and thus increase the unit-time diffusing quantities of alloying elements between delta ferritesand matrix. In addition, high temperature pre-deformation leads to dynamic recrystallization and increases thenumber of internal grain boundaries in the delta ferrites. This can also greatly increase the diffusing rate ofalloying elements. In these cases, the dissolution of delta ferrites can be promoted.

참고문헌 (8)

참고문헌 신청

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