Precipitation of γ’ during cooling of nickel-base superalloy Haynes 282
Journal article, 2021

Cooling-induced precipitation of the strengthening γ’ phase is commonly investigated in Ni-base superalloys with a high γ’ volume fraction, where it is used to control the final microstructure and properties. Less is known about the phase separation in low-volume-fraction alloys during cooling, although the microstructural state after cooling from solution treatment is known to affect subsequent heat-treatment steps. We use atomic-scale characterisation of Ni-base superalloy Haynes 282 (equilibrium γ’ volume fraction around 20%) to show that air cooling after solution or carbide stabilisation results in precipitation of nm-sized γ’ particles, whereas precipitation was suppressed during water quenching. The solution treatment has a significant effect on the hardness and γ’ precipitation during air cooling from the subsequent carbide stabilisation temperature. Also, the carbide-stabilisation treatment itself affects the γ’ precipitation during subsequent air cooling.

Superalloy

atom probe tomography

heat treatment

cooling

precipitation

Author

Ceena Joseph

GKN Aerospace Sweden

Chalmers, Industrial and Materials Science, Engineering Materials

Mattias Thuvander

Chalmers, Physics, Microstructure Physics

Christer Persson

Chalmers, Industrial and Materials Science, Engineering Materials

Magnus Hörnqvist Colliander

Chalmers, Physics, Microstructure Physics

Philosophical Magazine Letters

0950-0839 (ISSN) 1362-3036 (eISSN)

Vol. 101 1 30-39

Driving Forces

Sustainable development

Areas of Advance

Production

Materials Science

Subject Categories

Manufacturing, Surface and Joining Technology

Metallurgy and Metallic Materials

Corrosion Engineering

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1080/09500839.2020.1841314

More information

Latest update

1/5/2021 9