A new phase-field method for simulating γ′ precipitation in multicomponent nickel-base superalloys

✍ Scribed by T. Kitashima; H. Harada

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 629 KB
• Volume: 57
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2009.01.006

✦ Synopsis

The phase-field method is used to develop a new technique to simulate c 0 precipitation in multicomponent Ni-base superalloys. This technique generates the Gibbs free energy for both the c and c 0 phases from the single function formalism of both phases in the CALP-HAD method without using conventional CALPHAD software. The Gibbs free energy surfaces for eight-element multicomponent systems are used to confirm that there is an accurate coupling with the CALPHAD method, because they compare favorably with calculated results from Thermo-Calc. In addition, c 0 precipitation in a third-generation Ni-base superalloy containing eight components is simulated in one dimension with anti-phase effects of the c 0 phase on the precipitate interactions. The simulation results reveal late-stage enrichments of Re and W in the c phase during coalescence of the c 0 precipitates.