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AbstractAbstract
[en] Diffusion data of microalloying elements such as Nb, V, Ti, are required when analysing the transformation and recrystallization behaviour of HSLA steels in order to optimize grain refinement and precipitation hardening. The diffusion behaviour of Nb in pure Fe, Fe 1.5 Mn, Fe 0.6 Si and Fe 1.5 Mn 0.6 Si has been measured between 1080 and 12000C. Results indicate that Si increases Nb diffusivity while Mn decreases it. The sequence of diffusion coeficients values is: D sup(Nb) sub(Fe 1.5 Mn) < D sup(Nb) sub(Fe 1.5 Mn 0.6 Si) < D sup(Nb) sub(Fe puro) < D sup(Nb) sub(Fe 0.6 Si). Changes in diffusivity at low temperature probably due to grain boundary diffusion are also discussed. (Author)
[pt]
A analise do comportamento da recristalizacao e transformacao de microligas para otimizar o refinamento de grao e o endurecimento por precipitacao requer dados de difusao das microligas mais comuns: Nb, V, Ti nas faixas de composicao e temperaturas mais comuns. O comportamento da difusao do Nb no Fe puro, Fe 1.5 Mn, Fe 0.6 Si e Fe 1.5 Mn 0.6 Si foi medido entre 10800C e 12000C. Os resultados indicaram que o Si aumenta a difusividade do Nb enquanto o Mn o diminui. A sequencia dos valores dos coeficientes de difusao e: D sup(Nb) sub(Fe 1.5 Mn) < D sup(Nb) sub(Fe 1.5 Mn 0.6 Si) < D sup(Nb) sub(Fe puro) < D sup(Nb) sub(Fe 0.6 Si). Discutem-se tambem mudancas na difusividade em baixas temperaturas provavelmente devido a difusao do contorno do grao. (E.G.)Original Title
Difusion de Nb en Fe y algunas aleaciones de base Fe
Primary Subject
Source
1981; 17 p; 36. Annual Congress of ABM; Recife (Brazil); 5 - 10 Jul 1981
Record Type
Miscellaneous
Literature Type
Conference
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