Flow behaviors and microstructural evolutions of a novel high-Co powder metallurgy superalloy during hot working

[Display omitted] To understand how to tailor microstructure of high-Co polycrystalline superalloys during hot processing, the flow curves of a nickel-based superalloy with high Co content was quantitatively analyzed, and the microstructure evolution was studied by a high-throughput method. The resu...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials processing technology 2018-12, Vol.262, p.221-231
Main Authors: Tan, Liming, He, Guoai, Li, Yunping, Liu, Feng, Nie, Yan, Jiang, Liang
Format: Article
Language:English
Subjects:
Abnormally large grains
Annealing
Deformation
Flow behaviors
Grain structure
High Co content
High temperature
Hot working
Hot working condition
Microstructure
Nickel base alloys
Nickel-based superalloy
Powder metallurgy
Precipitates
Strain rate
Superalloys
Working conditions
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] To understand how to tailor microstructure of high-Co polycrystalline superalloys during hot processing, the flow curves of a nickel-based superalloy with high Co content was quantitatively analyzed, and the microstructure evolution was studied by a high-throughput method. The results suggested that hot working conditions, especially the temperature, strongly influenced the grain structure at annealing. In specific, deforming under low strain rate and high temperature conditions facilitated the recovery and grain growth to consume the stored strain energy, furthermore, the weakened pinning effects of γ′ precipitates accelerated these procedures, which made the high-Co superalloy more vulnerable to the formation of abnormally large grains during subsequent supersolvus annealing.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2018.06.039