Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel

W. T. Geng; Vei Wang; Jin Xu Li; Nobuyuki Ishikawa; Hajime Kimizuka; Kaneaki Tsuzaki; Shigenobu Ogata

doi:10.1016/j.scriptamat.2018.02.025

Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel

W. T. Geng, Vei Wang, Jin Xu Li, Nobuyuki Ishikawa, Hajime Kimizuka, Kaneaki Tsuzaki, Shigenobu Ogata

Strength of materials

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28 Citations (Scopus)

Abstract

Our first-principles calculations demonstrate that hydrogen is more stable in carbon supersaturated martensite than in α‑iron, due to the carbon-induced tetragonality in martensite lattice. The trapped hydrogen leads to remarkable decohesion between (110) planes both inside the martensite and along the martensite/ferrite interface, with the former being more significant than the latter. This decohesion can explain recent precise observations that in martensite/ferrite dual-phase steels the hydrogen-promoted crack was initiated in the martensite region and that in lath martensite steel it propagated not on lath boundaries but showed quasi-cleavage feature along (110) planes at very high hydrogen concentration.

Original language	English
Pages (from-to)	79-83
Number of pages	5
Journal	Scripta Materialia
Volume	149
DOIs	https://doi.org/10.1016/j.scriptamat.2018.02.025
Publication status	Published - May 2018

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2018.02.025

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@article{b14e91338e1044e88745ef88cb2ef661,

title = "Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel",

abstract = "Our first-principles calculations demonstrate that hydrogen is more stable in carbon supersaturated martensite than in α‑iron, due to the carbon-induced tetragonality in martensite lattice. The trapped hydrogen leads to remarkable decohesion between (110) planes both inside the martensite and along the martensite/ferrite interface, with the former being more significant than the latter. This decohesion can explain recent precise observations that in martensite/ferrite dual-phase steels the hydrogen-promoted crack was initiated in the martensite region and that in lath martensite steel it propagated not on lath boundaries but showed quasi-cleavage feature along (110) planes at very high hydrogen concentration.",

author = "Geng, {W. T.} and Vei Wang and Li, {Jin Xu} and Nobuyuki Ishikawa and Hajime Kimizuka and Kaneaki Tsuzaki and Shigenobu Ogata",

note = "Funding Information: This work was supported by NEDO Basic Research Program entitled “Technological Development of Innovative New Structural Materials”, JFE Steel Corporation , the Elements Strategy Initiative for Structural Materials (ESISM) and the National Science Foundation of China (Grant No. U1760203 ). K.T. acknowledges the support of JSPS KAKENHI (JP16H06365) and JST (grant #20100113 ) S.O. acknowledges the support of JSPS KAKENHI Grant Nos. JP17H01238 and JP17K18827 Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2018",

month = may,

doi = "10.1016/j.scriptamat.2018.02.025",

language = "English",

volume = "149",

pages = "79--83",

journal = "Scripta Materialia",

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publisher = "Elsevier Limited",

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T1 - Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel

AU - Geng, W. T.

AU - Wang, Vei

AU - Li, Jin Xu

AU - Ishikawa, Nobuyuki

AU - Kimizuka, Hajime

AU - Tsuzaki, Kaneaki

AU - Ogata, Shigenobu

N1 - Funding Information: This work was supported by NEDO Basic Research Program entitled “Technological Development of Innovative New Structural Materials”, JFE Steel Corporation , the Elements Strategy Initiative for Structural Materials (ESISM) and the National Science Foundation of China (Grant No. U1760203 ). K.T. acknowledges the support of JSPS KAKENHI (JP16H06365) and JST (grant #20100113 ) S.O. acknowledges the support of JSPS KAKENHI Grant Nos. JP17H01238 and JP17K18827 Publisher Copyright: © 2018 Acta Materialia Inc.

PY - 2018/5

Y1 - 2018/5

N2 - Our first-principles calculations demonstrate that hydrogen is more stable in carbon supersaturated martensite than in α‑iron, due to the carbon-induced tetragonality in martensite lattice. The trapped hydrogen leads to remarkable decohesion between (110) planes both inside the martensite and along the martensite/ferrite interface, with the former being more significant than the latter. This decohesion can explain recent precise observations that in martensite/ferrite dual-phase steels the hydrogen-promoted crack was initiated in the martensite region and that in lath martensite steel it propagated not on lath boundaries but showed quasi-cleavage feature along (110) planes at very high hydrogen concentration.

AB - Our first-principles calculations demonstrate that hydrogen is more stable in carbon supersaturated martensite than in α‑iron, due to the carbon-induced tetragonality in martensite lattice. The trapped hydrogen leads to remarkable decohesion between (110) planes both inside the martensite and along the martensite/ferrite interface, with the former being more significant than the latter. This decohesion can explain recent precise observations that in martensite/ferrite dual-phase steels the hydrogen-promoted crack was initiated in the martensite region and that in lath martensite steel it propagated not on lath boundaries but showed quasi-cleavage feature along (110) planes at very high hydrogen concentration.

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EP - 83

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

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Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel

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