학술논문
Influence of dynamic strain ageing on fracture behaviour and stretch zone formation of a reactor pressure vessel steel
Document Type
Original Paper
Source
International Journal of Fracture. November 2016 202(1):79-91
Subject
Language
English
ISSN
0376-9429
1573-2673
1573-2673
Abstract
Fracture behaviour of a reactor pressure vessel steel has been studied under dynamic strain ageing (DSA) conditions. Severity of DSA is varied by changing both the loading rate and test temperature. Significant reduction in fracture toughness is noted at 235∘C, which is recovered with further increase of temperature at slow loading rate. DSA influence on fracture behaviour diminished with temperature at fast loading rate. DSA led to repeated crack tip blunting and “ridge-valley” fractographic features. Defining the stretch zone boundary was difficult in such cases, and applying stretch zone method for determination of initiation fracture resistance seemed to be inappropriate.