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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.9 (2003)  >  pp.1802-1808

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Strain Enhanced Growth of Precipitates during Creep of T91

Takeshi Nakajima1), Stefano Spigarelli2), Enrico Evangelista2) and Takao Endo1)
1) Department of Materials Engineering, Yokohama National University
2) Department of Mechanics, University of Ancona

The previous work showed that the precipitate coarsening of T91 (Modified 9Cr–1Mo steel) was described by an empirical relationship depending on applied stress. However, there is another possibility that the stress dependent coarsening is merely apparent and strain dependent actually. In the present paper, an attempt was made to re-analyze the previous data based on a model in which the effective diffusivity of solute is strain dependent. The result of analysis suggests strongly that the dislocation dragging solute atmosphere causes the enhancement of solute diffusivity and leads to the promoted growth of precipitates.

T91, creep, precipitate, Ostwald ripening, diffusion, atmosphere

Received: June 03, 2003
Accepted: July 22, 2003 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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