|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Material Design Approaches and Experiences IV
||Application-specific R&D Pathway to Higher-Temperature Gamma (TiAl) Alloy Materials and Processes
||Young-Won Kim, Sang-Lan Kim
|On-Site Speaker (Planned)
The current gamma alloy materials technology faces dilemmas in that their service temperatures for aero-engine LPT blade applications are limited to slightly over 700°C set by three engineering alloy systems: GE-4822 (cast DP/NL), RR-45XD (cast XDL) and MTU/PW-TNM (Wrought NL). The limitations, far below the potential use temperature range (800-900°C) in coarse-grained fully lamellar (FL) forms, have remained unchanged for 10-20 years. No new materials-processes that will break the deadlock are in sight as the R&D community continues to faithfully follow the inherited, usual R&D paths. In this talk, we will introduce the ways of developing high temperature gamma alloys: 1) solid solution hardening, 2) nearly-lamellar (NL) generation, 3) near gamma beta solidification generating fine-grained gamma-rich FL material forms, and 4) incoherent particle strengthening. It will be shown that integration of quantified composition-processing-microstructure-property relationships and the property requirements into the development path is vital for designing higher-temperature alloys and processes.
||Planned: TMS Journal: JOM