Retardation of σ-phase transformation in modified superalloy RR2072
Autor: | Q. Z. Chen, D. M. Knowles |
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Rok vydání: | 2002 |
Předmět: |
chemistry.chemical_classification
Materials science Base (chemistry) Precipitation (chemistry) Alloy Metallurgy Metals and Alloys engineering.material Condensed Matter Physics Microstructure Carbide Superalloy chemistry Mechanics of Materials Transmission electron microscopy Phase (matter) engineering |
Zdroj: | Metallurgical and Materials Transactions A. 33:1319-1330 |
ISSN: | 1543-1940 1073-5623 |
DOI: | 10.1007/s11661-002-0058-9 |
Popis: | A comparative investigation of σ-phase transformation in base and modified experimental alloy RR2072 (C, Hf, and B) has been undertaken. The alloys were exposed at 950 °C for 5 to 500 hours. It was found that σ-phase transformation was notably retarded in the modified alloys due to the prior formation of M23C6 carbides and Ta/Ti being tied up in the MC phase. Detailed investigation has revealed that M23C6 carbides absorb Cr, Mo, and Co, consequently retarding σ-phase transformation that demands Cr, Mo, and Co in addition to Re. In the interdendritic regions, the growth of σ-phase was physically limited by MC carbides and chemically inhibited by the very localized microsegregation. |
Databáze: | OpenAIRE |
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