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
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.