|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||E-23: Prediction of Incipient Melting Map and γ' Features of Ni-base Superalloys Using Molecular Orbital Method
||Mohammad Mostafaei, S. M. Abbasi
|On-Site Speaker (Planned)
Experimental nickel-base superalloys based on commercial CM247 LC containing Al and Ta were designed on the basis of Molecular Orbital calculation. Several models were developed to predict γ' solvus and γ/γ' eutectic dissolving temperatures, volume fraction of γ' precipitates and susceptibility to incipient melting during solution annealing. Solutioning and aging treatment were carried out following Cannon-Muskegon Corporation indication. For simplifying the model, Md and Bo parameters were replaced by a new electronic parameter (θ) named alloying angle. DSC thermal analysis and quantitative metallography results showed that a decrease in θ magnitude increases γ' solvus and γ' volume fraction considerably in the solutionized and aged condition. The suggested model presented an incipient melt fraction (IMF) map versus Al and Ta contents to predict a safe zone from incipient melting point of view during solutionizing treatment. As a result, Al+Ta contents must be less than 6 wt% to reach IMF < 1%.
||Planned: Supplemental Proceedings volume