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题名: Secondary Precipitation Behavior of Nitride in the Electro-slag Remelted Structure of Alloy 690
作者: Wang, Min;  Chen, Bo;  Hao, Xian-Chao;  Ma, Ying-Che;  Liu, Kui
发表日期: 2017-8-1
摘要: The precipitation and evolution of secondary nitrides (S-nitrides) in the Alloy 690 electro-slag remelted (ESR) structure were investigated. Experimental results indicate that S-nitrides precipitated in the interdendritic region of the ESR structure at temperatures higher than 1100 degrees C. S-nitrides could spread throughout the entire interdendritic area after sufficient exposure, and they were more numerous and much finer than primary nitrides. Furthermore, after studying the evolution of S-nitride particles at 1100, 1200 and 1300 degrees C, it was determined that the precipitation of S-nitrides was controlled by the diffusion of nitrogen. In addition, by investigating the elemental segregation of ESR structure and calculating critical Ti concentrations, S-nitride precipitation was found to be thermodynamically inevitable in the Alloy 690 ESR structure.
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Recommended Citation:
Wang, Min,Chen, Bo,Hao, Xian-Chao,et al. Secondary Precipitation Behavior Of Nitride In The Electro-slag Remelted Structure Of Alloy 690[J]. Acta Metallurgica Sinica-english Letters,2017,30(8):771-780.

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