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Transformation During Aging of Niobium-Rich Carbides in Cast Heat-Resistant Alloys

Rosa Ortega-Reyes,Sergio Haro-Rodríguez,Ireri A. Sustaita-Torres, Francisco A. Pérez González,Javier H. Ramírez-Ramírez,Nelson F. Garza-Montes-de-Oca,Rafael Colás

Metallurgical and Materials Transactions A（2022）

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Abstract
The changes occurring in two heat-resistant alloys while aged at 750 °C for different periods of time were studied. Aging promoted precipitation of secondary M 23 C 6 carbides and transformation of Nb-rich, which were evaluated by SEM. The results show that transformation of the NbC starts from their boundaries to their centre by silicon diffusion; carbon was detected to migrate from these particles promoting precipitation of secondary Cr-rich carbides in regions adjacent to the Nb-rich particles.
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alloys,niobium-rich,heat-resistant
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