PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 t t l t it i Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ il l li i i

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ScienceDirect

Procedia Structural Integrity 42 (2022) 570–577

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract The Small Punch Test (SPT) is a useful technique for deriving location-dependent mechanical properties using small-sized specimens. In this work, we have investigated the tensile and fracture behavior of T91 steel, a candidate material for fusion and Gen IV fission nuclear reactors, by the SPT technique. Firstly, the hot shear flow behavior of T91 steel was investigated by SPT in the temperature range of 400 – 550 ºC under quasi-static strain rates (0.003 mm/min and 0.3 mm/min). Further, the hot deformation material parameters in the exponential power-law and hyperbolic sine constitutive equations have been evaluated. The effect of temperature and strain rate variation on stress exponent in power-law and activation energy from hyperbolic sine equation have been correlated. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Small Punch Test; T91 steel; hyperbolic sine equation. 1. Introduction The major components in fusion and Gen IV fission nuclear reactors are subjected to harsh operating conditions which cause gradual degradation of material characteristics and mechanical performance (Hussein 2020). Hence, a precise determination of the mechanical properties of operational components is vital for component reliability enhancement, optimization of operating methods. and maintenance and repair strategies of the reactors. . , 1 steel, a candidate material for f , . , . . . , . . . . . This is an open access article under the CC BY-NC-ND license . . ll t; t l; li i ti . 23 European Conference on Fracture - ECF23 Investigation of strain-rate sensitivity of T91 Steel Using Small Punch Testing Gauri Mahalle a , Thomas P. Davis b , William E. Lee a and Abdullah Al Mamun a * a Nuclear Futures Institute, Bangor University, Bangor Gwynedd LL57 2DG, United Kingdom b Oxford Sigma Ltd, Harwell Innovation Centre, 173 Curie Avenue, Oxfordshire, OX11 0QG, United Kingdom Investigation of strain-rate sensitivity of T91 Steel Using Small m b a a l t tit t , i it , , it i f i t , ll ti t , i , f i , , it i

* Corresponding author. Tel.: +44 1248382356; fax: +44 1248 382330. E-mail address: abdullah.mamun@bangor.ac.uk i t . l.: ; : . il ll . . .

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 l i . . i i ti l t CC BY-N li tt :// ti . /li / / . / t . li

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.072