|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Improved Creep Strength of Nickel-base Superalloys by Optimized
γ/γ'-partitioning Behavior of Solid Solution Strengthening Elements
||Steffen Neumeier, Martin Pröbstle, Sven Giese, Ralf Rettig, Mathias Göken
|On-Site Speaker (Planned)
Solid solution strengthening of the γ-matrix is one key factor for improving the creep strength of single crystal nickel-base superalloys in the high temperature creep regime where dislocations climb along the γ/γ'-interface. Investigations on the creep properties of a series of alloys with constant Ni, Co, Al and Cr content and 3.6 at.% of Ir, Mo, Re, Rh, Ru, W and combinations of Re, Mo and W show that the diffusivity of the refractory elements in combination with their tendency to partition to the γ-matrix influences strongly the creep strength. Based on these findings the creep strength of a Re-free alloy was significantly improved by optimizing the partitioning behavior of the slowly diffusing element W through the addition of Ti. The Re-free alloy shows a creep strength similar to that of the Re-containing alloy CMSX-4.