Direct powder forging of PM nickel-based Superalloy: densification and recrystallisation
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Powder metallurgy nickel-based superalloys have been widely used in high temperature applications. For these materials, a fully dense and fine-grained microstructure is important. Full densification can be achieved by a suitable processing technique, while the latter can be achieved through recrystallisation for which valuable guidance is provided by the information about recrystallisation nuclei. In this study, a fully dense powder metallurgy nickel-based superalloy component has been produced by a new manufacturing method—direct powder forging—using a single acting hydraulic press under normal atmosphere. Boundary misorientation of the produced material has been analysed to determine the degree of recrystallisation nucleation. A finite element model for direct powder forging has been developed in DEFORM-2D/3D and validated by comparing experimental and simulated load curves. The relationship of stress and strain state with densification and recrystallisation nucleation degree has been analysed. It was found that the direct powder forged FGH96 alloy has a much higher recystallisation nucleation degree and more recrystallised sub-grains, compared with those of the hot isostatic pressed material. Within the forged component, a higher recystallisation nucleation degree resides in the material near the container wall where greater values of shear strain rate have operated.
Date Issued
2016-06-06
Date Acceptance
2016-05-20
Citation
International Journal of Advanced Manufacturing Technology, 2016, 88 (9-12), pp.2661-2670
ISSN
1433-3015
Publisher
Springer Verlag
Start Page
2661
End Page
2670
Journal / Book Title
International Journal of Advanced Manufacturing Technology
Volume
88
Issue
9-12
Copyright Statement
© The Author(s) 2016. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
License URL
Sponsor
Beijing Institute of Aeronautical Materials (BIAM)
Grant Number
N/A
Subjects
Science & Technology
Technology
Automation & Control Systems
Engineering, Manufacturing
Engineering
Direct powder forging
PM nickel-based superalloy
Finite element modelling
Fully dense component
Densification
Recrystallisation
ABNORMAL SUBGRAIN GROWTH
MICROSTRUCTURE EVOLUTION
DEFORMATION-BEHAVIOR
STRESS TRIAXIALITY
GRAIN-GROWTH
STRAIN-RATE
TEMPERATURE
SIMULATION
MODEL
MECHANISMS
09 Engineering
08 Information And Computing Sciences
01 Mathematical Sciences
Industrial Engineering & Automation
Publication Status
Published