Evolution of gamma prime precipitate in IN-713C for long aging treatments

GES ALEJANDRO MARIO; FORNARO OSVALDO; PALACIO HUGO A

Boston

Congreso; Materials Research Society Annual Meeting; 1997

Materials Research Society

<!-- @page { margin: 2cm } H2.direcciones-western { margin-bottom: 2cm; color: #000000; font-family: "Arial", sans-serif; font-size: 12pt; so-language: es-ES; text-decoration: none } H2.direcciones-cjk { margin-bottom: 2cm; color: #000000; font-family: "Arial", sans-serif; font-size: 12pt; text-decoration: none } H2.direcciones-ctl { margin-bottom: 2cm; color: #000000; font-family: "Arial", sans-serif; font-size: 12pt; text-decoration: none } H2.nombres-western { margin-top: 0.42cm; color: #000000; font-family: "Arial", sans-serif; font-size: 12pt; so-language: en-US; text-decoration: none } H2.nombres-cjk { margin-top: 0.42cm; color: #000000; font-family: "Arial", sans-serif; font-size: 12pt; text-decoration: none } H2.nombres-ctl { margin-top: 0.42cm; color: #000000; font-family: "Arial", sans-serif; font-size: 12pt; text-decoration: none } H2 { margin-left: 1cm; margin-right: 1cm; margin-top: 0cm; margin-bottom: 0cm; direction: ltr; color: #c0c0c0; text-align: center; widows: 2; orphans: 2; text-decoration: underline } H2.western { font-family: "Arial", sans-serif; font-size: 12pt; so-language: en-US } H2.cjk { font-family: "Arial", sans-serif; font-size: 12pt } H2.ctl { font-family: "Arial", sans-serif; font-size: 12pt } P { text-indent: 1cm; margin-bottom: 0.21cm; direction: ltr; color: #000000; text-align: justify; widows: 2; orphans: 2 } P.western { font-family: "Times New Roman", serif; font-size: 12pt; so-language: en-US } P.cjk { font-family: "Times New Roman", serif; font-size: 12pt } P.ctl { font-family: "Times New Roman", serif; font-size: 12pt } A.sdfootnotesym { color: #008080 } A.sdendnotesym { font-size: 12pt } -->The strength of nickel-base superalloys hardened through precipitation is related to the volume fraction, particle size and distribution of the precipitate phase gamma prime: 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 g¢ precipitate phase, the evaluation of two different heat treatments through the microstructure analysis and g¢ morphology and tensile properties between 873-1123K. We found that for short aging times, t <  9x106s, the coarsening can be approximated by a linear volumetric growth as predicted by LSW theory. For a time greater than 9x106s the growth rate of g¢ precipitate shows an asymptotic behavior in both heat treatments.