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Evolution of γ′ Precipitate in in-713C for Long Aging Treatments

Published online by Cambridge University Press:  10 February 2011

A. Ges ,
O. Fornaro  and
H. Palacio
A. Ges
Affiliation:
IFIMAT-CIC, U-NICEN, Pinto 399 (7000) Tandil, Argentina.solidif@exa.unicen.edu.ar
O. Fornaro
Affiliation:
IFIMAT-CIC, U-NICEN, Pinto 399 (7000) Tandil, Argentina.solidif@exa.unicen.edu.ar
H. Palacio
Affiliation:
IFIMAT-CIC, U-NICEN, Pinto 399 (7000) Tandil, Argentina.solidif@exa.unicen.edu.ar
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Abstract

The strength of nickel-base superalloys hardened through precipitation is related to the volume fraction, particle size and distribution of the precipitate phase γ′: Ni3(Al,Ti). Such particles grow during the initial heat treatment and for long aging times, and it is very important to predict the kinetics growth owing to its technological application at high temperatures. In this work, we performed the analysis of the particle coarsening in IN-713C during long aging times at constant temperature (T=1223K), given an initial size, the volume fraction distribution of the γ′ precipitate phase, the evaluation of two different heat treatments through the microstructure analysis and γ′ morphology and tensile properties between 873–1123K. We found that for short aging times, t < 9×106s, the coarsening can be approximated by a linear volumetric growth as predicted by LSW theory. For a time greater than 9×106s the growth rate of γ′ precipitate shows an asymptotic behavior in both heat treatments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 195
Copyright
Copyright © Materials Research Society 1998

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