Retardation of σ-phase transformation in modified superalloy RR2072

Autor: Q. Z. Chen, D. M. Knowles
Rok vydání: 2002
Předmět:
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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