About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
A-11: Principle for Homogenization Design of High-generation Single Crystals Superalloys Containing Increased Refractory Contents |
Author(s) |
Wanshun Xia, Xinbao Zhao, Quanzhao Yue, Yuefeng Gu, Ze Zhang |
On-Site Speaker (Planned) |
Wanshun Xia |
Abstract Scope |
Increasing the fractions of certain refractory elements resulted in the development of modern single-crystal superalloys with improved high-temperature performance, but also increased solidification segregation of elements. The importance of solution treatment to reduce segregation and homogenize the microstructure has been well verified; however, guidelines for achieving simple but effective homogenization practices have yet to be developed. In this study, the effects of different solution treatments on the creep properties of a fourth-generation single-crystal superalloy were investigated, and two guidelines for designing homogenization practices for modern single-crystal superalloys were proposed. First, the degree of homogenization achieved by solution treatment will be saturated once the dendritic segregation coefficient of specific elements reaches a certain limit (lower than 1.2 for Re and W, and higher than 0.9 for Al and Ta). Second, if the residual segregation is strong, different degrees of local deformations between the dendrite core (D) and interdendritic (ID) regions induce uneven fractures in the alloy. An effective, fully homogenized structure should exhibit similar local strengths in the D and ID regions. These guidelines will help assess the effectiveness of solution treatments and guide the development of new solution treatment strategies for modern single-crystal superalloys. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |