Effect of hydrogen on the ductility reduction of F82H martensitic steel after different heat treatments

Citation
M. Beghini et al., Effect of hydrogen on the ductility reduction of F82H martensitic steel after different heat treatments, J NUCL MAT, 288(1), 2001, pp. 1-6
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Nuclear Emgineering
Journal title
JOURNAL OF NUCLEAR MATERIALS
ISSN journal
00223115 → ACNP
Volume
288
Issue
1
Year of publication
2001
Pages
1 - 6
Database
ISI
SICI code
0022-3115(200101)288:1<1:EOHOTD>2.0.ZU;2-9
Abstract
The influence of heat treatment on hydrogen embrittlement (HE) susceptibili ty of F82H martensitic steel, a candidate material for the first wall and b lanket of the DEMO reactor, was investigated by means of low strain rate te sts conducted at room temperature on notched cylindrical specimens, pre-cha rged with hydrogen. Three types of thermal treatment were compared, which p roduced quite different material hardness and strengths. As a general rule, F82H steel exhibited a strong susceptibility to HE in all conditions, with transitions between ductile and brittle behaviour ranging from 0.5 to 1.0 wppm H. The comparison of results produced by the different heat treatments confirmed for F82H also the tendency toward an increase of the susceptibil ity with material hardness. Moreover, the examined steel appeared to be mor e sensible to HE than another martensitic steel (MANET II), which was also proposed as a candidate material for fusion reactor first wall application. (C) 2001 Elsevier Science B.V. All rights reserved.