TY - JOUR
T1 - Surface orientation dependence of hydrogen flux in lenticular martensite of an Fe-Ni-C alloy clarified through in situ silver decoration technique
AU - Koyama, Motomichi
AU - Yamasaki, Daisuke
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:
© 2018 Elsevier B.V.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - An in situ silver decoration technique was applied to investigate the effect of microstructure on hydrogen flux in an austenite/α′-martensite dual-phase Fe-32Ni-0.2C alloy. Using time-resolved hydrogen mapping, the surface orientation of the body-centered cubic lenticular martensite was found to have a significant effect on hydrogen flux. The hydrogen flux was particularly high at the near-〈0 0 1〉 while it was the lowest at the near-〈1 1 1〉 surface. This dependence of hydrogen flux on the surface orientation is attributed to hydrogen trapping at dislocations in the martensite. Particularly, 〈1 1 1〉 twinning-shear in the martensite enhances hydrogen trapping at dislocations, suppressing hydrogen diffusion in the shortest path of grains orientated to 〈1 1 1〉.
AB - An in situ silver decoration technique was applied to investigate the effect of microstructure on hydrogen flux in an austenite/α′-martensite dual-phase Fe-32Ni-0.2C alloy. Using time-resolved hydrogen mapping, the surface orientation of the body-centered cubic lenticular martensite was found to have a significant effect on hydrogen flux. The hydrogen flux was particularly high at the near-〈0 0 1〉 while it was the lowest at the near-〈1 1 1〉 surface. This dependence of hydrogen flux on the surface orientation is attributed to hydrogen trapping at dislocations in the martensite. Particularly, 〈1 1 1〉 twinning-shear in the martensite enhances hydrogen trapping at dislocations, suppressing hydrogen diffusion in the shortest path of grains orientated to 〈1 1 1〉.
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U2 - 10.1016/j.matlet.2018.06.022
DO - 10.1016/j.matlet.2018.06.022
M3 - Article
AN - SCOPUS:85048329065
SN - 0167-577X
VL - 228
SP - 273
EP - 276
JO - Materials Letters
JF - Materials Letters
ER -