Macro- and micro-mechanical behaviour of a γ′ strengthened Ni-based superalloy at cryogenic temperatures
Artikel i vetenskaplig tidskrift, 2021

In-situ neutron diffraction was performed during tensile deformation of Ni-base superalloy, Haynes 282, at 20, 100 and 300 K. Two distinct uni-modal microstructures with fine (20 nm) and coarse (200 nm) \(\gamma^\prime\) particles were investigated. On the macro-scale yield strength increased and ductility decreased with decreasing temperature, although most significant decrease in ductility occurred between 100 and 20 K. The work hardening differed between the two microstructures, but was independent of temperature for each microstructure. On the micro-scale intergranular elastic interactions mainly lead to a transfer of the load to grains with the $\left<200\right>$ parallel to the tensile axis. No further load re-distribution between matrix and particles occurred in the microstructure with fine \(\gamma^\prime\), where shearing of precipitates lead to co-deformation at all temperatures. In the coarse \(\gamma^\prime\) microstructure, the load was transferred intragranularly from matrix to particles, in addition to the intergranular load transfer. The particles initially behaved elastically while the matrix deformed plastically, but at higher stresses a change in load partitioning indicated that also the \(\gamma^\prime\) phase underwent plastic deformation as a result of the elastic stress build-up from the load partitioning. The tendency for, and effect of, plastic deformation of \(\gamma^\prime\) increased with decreasing temperature.

In-situ neutron diffraction

Ni-base superalloy

Cryogenic temperatures

Load re-distribution

Phase-specific response


Nitesh Raj Jaladurgam

Chalmers, Fysik, Mikrostrukturfysik

Saurabh Kabra

ISIS Neutron and Muon Source

Magnus Hörnqvist Colliander

Chalmers, Fysik, Mikrostrukturfysik

Materials and Design

0264-1275 (ISSN) 1873-4197 (eISSN)

Vol. 209 109954

In-situ studies of microstructural evolution during processing and service of high-temperature materials

Stiftelsen för Strategisk forskning (SSF), 2017-01-01 -- 2020-12-31.

Sveriges Neutronforskarskola - SwedNESS

Stiftelsen för Strategisk forskning (SSF) (GSn15-0008), 2016-07-01 -- 2021-06-30.

Stiftelsen för Strategisk forskning (SSF) (GSn15-0008), 2017-01-01 -- 2020-12-31.


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