TY - JOUR
T1 - Revisiting the effects of hydrogen on deformation-induced γ-ε martensitic transformation
AU - Koyama, Motomichi
AU - Terao, Natsuki
AU - Tsuzaki, Kaneaki
N1 - Funding Information:
This study was supported by the Japan Science and Technology Agency (JST) (grant: 20100113 ) under Industry-Academia Collaborative R&D Program “Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials”. M. Koyama and K. Tsuzaki acknowledge financial support from JSPS KAKENHI ( JP16H06365 ; JP17H04956 ).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/8/15
Y1 - 2019/8/15
N2 - Hydrogen effects on deformation-induced γ-ε martensitic transformation were revisited in terms of morphology, number density, and fraction of ε-martensite in strained austenitic steel. Hydrogen charging suppresses the stress-assisted nucleation of the martensite in stress criterion, which is consistent with a previous finding that hydrogen suppresses thermally induced γ-ε martensitic transformation. At an identical strain (e.g., 4%), hydrogen charging decreases the average thickness of ε-martensite plates, but increases their number density. As a result, hydrogen charging promotes deformation-induced γ-ε martensitic transformation when compared at the identical strain. These facts provide the following two conclusions: (1) hydrogen increases the required elastic strain energy for martensite nucleation and (2) hydrogen promotes a dislocation-motion-related nucleation process.
AB - Hydrogen effects on deformation-induced γ-ε martensitic transformation were revisited in terms of morphology, number density, and fraction of ε-martensite in strained austenitic steel. Hydrogen charging suppresses the stress-assisted nucleation of the martensite in stress criterion, which is consistent with a previous finding that hydrogen suppresses thermally induced γ-ε martensitic transformation. At an identical strain (e.g., 4%), hydrogen charging decreases the average thickness of ε-martensite plates, but increases their number density. As a result, hydrogen charging promotes deformation-induced γ-ε martensitic transformation when compared at the identical strain. These facts provide the following two conclusions: (1) hydrogen increases the required elastic strain energy for martensite nucleation and (2) hydrogen promotes a dislocation-motion-related nucleation process.
KW - Austenitic steel
KW - Electron channeling contrast imaging
KW - Hexagonal close-packed structure
KW - Hydrogen
KW - Martensitic transformation
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U2 - 10.1016/j.matlet.2019.04.093
DO - 10.1016/j.matlet.2019.04.093
M3 - Article
AN - SCOPUS:85064709841
SN - 0167-577X
VL - 249
SP - 197
EP - 200
JO - Materials Letters
JF - Materials Letters
ER -