Understanding the effect of irradiation temperature on microstructural evolution of 20MnMoNi55 steel.

Autor: Srivastava AP; Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India. *apsri@barc.gov.in., Sharma SK; Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India., Saini S; Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India., Neogy S; Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India., Ghosh SK; MaterialsProcessing and Corrosion Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India., Kabiraj D; Inter-University Accelerator Centre, New Delhi, 110067, India., Tewari R; Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Sep 30; Vol. 12 (1), pp. 16366. Date of Electronic Publication: 2022 Sep 30.
DOI: 10.1038/s41598-022-18538-5
Abstrakt: In this study, the effect of irradiation temperature on microstructural evolution of Indian RPV steel is reported. This study, by virtue of helium ion irradiation at 77, 300 and 573 K, could bring out the effect of the irradiation induced defects on microstructural and mechanical property changes at different stages of their existence starting from the state of cascade damage till the point of their free migration. Irradiation experiments were performed with varying ion energies to achieve nearly uniform irradiation damage of 0.05, 0.2 and 3 dpa in a ~ 300 nm wide region. Irradiated samples were characterized using GIXRD, PAS, TEM and nanoindentation. Unirradiated samples showed predominant presence of a combination of di- and tri-vacancy type of defects. Most of the dislocations present in unirradiated samples were screw dislocations, while mixed type was noticed upon irradiation irrespective of the irradiation temperature. PAS study showed formation of distinct defect types at different irradiation temperatures. TEM study confirmed formation of dislocation loops and defect clusters on irradiation. Higher irradiation temperatures resulted in the extension of the width of the damage region owing to increased migration of defects.
(© 2022. The Author(s).)
Databáze: MEDLINE
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