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Effect of water and mercury quenching on the microstructure and mechanical behavior of room temperature rolled Zircaloy-2

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Title Effect of water and mercury quenching on the microstructure and mechanical behavior of room temperature rolled Zircaloy-2
 
Creator Goel, Sunkulp
Singh, Dharmendra
Kumar, Nikhil
Chauhan, Abhishek Kumar
Singh, Punit
 
Subject Ultrafine grains
Zircaloy-2
Transmission electron microscopy
Electron back scattered diffraction
Annealing
Quenching
 
Description 432-436
The present study investigates the effect of water and mercury quenching on the microstructural and mechanical behavior
of room temperature rolled Zircaloy-2. Solution treatment of Zircaloy-2 at 1073 K followed by quenching in mercury and
water has been performed prior to rolling. Different reduction from 25% to 85% of the quenched alloy and further
characterization has been performed by tensile testing, Electron back scattered diffraction (EBSD) and Transmission
Electron Microscopy (TEM). Enhanced tensile strength (745 MPa) after 85% rolling reduction was obtained compared to
389 MPa after water quenching. Rolling reduction results an increase in the dislocation density, thereby enhancing the
mechanical strength. Initial deformation has been observed by the activation of extension twinning from EBSD
microstructure. Twinning results the inclination of ‘c’ axis towards the normal direction which makes near basal grains
orientation along the deformation direction. Due to hard orientation i.e. ‘c’ axis aligned along the loading direction, the grain
fragmentation is heterogeneous. Grain fragmentation leads to improvement in the ductility with minimal loss in strength
owing to rearrangement of dislocations after annealing at 400o C for 30 minutes. By optimizing the annealing temperature
(400o C for 30 minutes), bulk ultrafine grained Zircaloy-2 have been produced in 85% room temperature rolled Zircaloy-2.
 
Date 2022-08-16T06:06:02Z
2022-08-16T06:06:02Z
2022-08
 
Type Article
 
Identifier 0975-1017 (Online); 0971-4588 (Print)
http://nopr.niscpr.res.in/handle/123456789/60288
https://doi.org/10.56042/ijems.v29i4.47288
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJEMS Vol.29(4) [AUG 2022]