Deformation and densification behaviours of nickel-based superalloy during hot isostatic pressing

ABSTRACT

Hot isostatic pressing of nickel-based superalloys has important applications for manufacturing near-net shape parts such as turbine disks and jet engine parts, which have to operate at high temperatures. Finite element modelling can be used to predict deformation and densification behaviour of such superalloys. Thus, the cost and time of trial and error to obtain the required geometry of the part can be reduced, such that near-net shape parts can be manufactured more economically. Numerical simulations were carried out by implementing the model of ElRakayby and Kim into Abaqus-FEA. The model parameters (relative density functions f and c) for the nickel-based superalloy were obtained from the creep response and compressive strength of porous and solid powder compacts at high a temperature. The agreement between finite element calculations and the experimental data was good for densification, shape change and density distribution of nickel-based superalloy during hot isostatic pressing.

GRAPHICAL ABSTRACT

KEYWORDS:

• Nickel-based superalloy
• hot isostatic pressing
• stacking fault energy
• densification
• finite element analysis

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

Hosam ElRakayby is a PhD candidate at Mechanical Engineering Department of POSTECH University. He has been working in powder metallurgy for the last 4 years, pursuing a PhD thesis about the densification and deformation behaviors of metal powders during hot isostatic pressing.

KiTae Kim is a professor of Mechanical Engineering Department of POSTECH University. His research interests include (a) Mechanics of porous materials (b) Crystal plasticity.

ORCID

Hosam ElRakayby http://orcid.org/0000-0003-0186-1139

Additional information

Funding

This work was supported by Korean Agency for Defense Development [grant number UE155043GD]. We are grateful for this support.