TY - JOUR
T1 - Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation
AU - Wang, Dong
AU - Hagen, Anette Brocks
AU - Wan, Di
AU - Lu, Xu
AU - Johnsen, Roy
N1 - Publisher Copyright:
© 2021 The Authors
PY - 2021/9/8
Y1 - 2021/9/8
N2 - The hydrogen effect on a X65 carbon steel was investigated using in-situ electrochemical nanoindentation approach. The alterations in elastic behavior, pop-in load, and hardness under hydrogen-free and hydrogen-charged conditions in both ferrite and bainite were compared and discussed. The results demonstrated a non-affected elastic behavior by hydrogen in both microconstituents. The homogeneous and heterogeneous dislocation nucleation are proposed as the dominant mechanisms for pop-in behavior in ferrite and bainite, respectively. In addition, the reduction of pop-in load by hydrogen in both microconstituents indicates a hydrogen-enhanced dislocation nucleation in both homogenous and heterogeneous manners. Moreover, a hydrogen-induced hardness increment was detected in both microconstituents, which is related to the hydrogen-enhanced lattice friction on dislocations. Also, the more prominent hardness increment in bainite was caused by its significantly more trapping sites.
AB - The hydrogen effect on a X65 carbon steel was investigated using in-situ electrochemical nanoindentation approach. The alterations in elastic behavior, pop-in load, and hardness under hydrogen-free and hydrogen-charged conditions in both ferrite and bainite were compared and discussed. The results demonstrated a non-affected elastic behavior by hydrogen in both microconstituents. The homogeneous and heterogeneous dislocation nucleation are proposed as the dominant mechanisms for pop-in behavior in ferrite and bainite, respectively. In addition, the reduction of pop-in load by hydrogen in both microconstituents indicates a hydrogen-enhanced dislocation nucleation in both homogenous and heterogeneous manners. Moreover, a hydrogen-induced hardness increment was detected in both microconstituents, which is related to the hydrogen-enhanced lattice friction on dislocations. Also, the more prominent hardness increment in bainite was caused by its significantly more trapping sites.
KW - Carbon steel
KW - Dislocation
KW - Hydrogen embrittlement
KW - In-situ test
KW - Nanoindentation
UR - http://www.scopus.com/inward/record.url?scp=85111288776&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2021.141819
DO - 10.1016/j.msea.2021.141819
M3 - Article
AN - SCOPUS:85111288776
SN - 0921-5093
VL - 824
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 141819
ER -