The effect of Si on hydrogen embrittlement of Fe-18Mn-0.6C-xSi twinning-induced plasticity steels

Sang Min Lee, Il Jeong Park, Jae Gil Jung, Young Kook Lee

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The hydrogen embrittlement (HE) of Fe-18Mn-0.6C-xSi (wt.%) twinning-induced plasticity (TWIP) steels was investigated through slow strain rate tensile tests (SSRTs) and thermal desorption analyses of electrochemically H-charged specimens. Whereas the H-charged Si-free steel showed only the (Fe,Mn)O layer with a fcc crystal structure on the surface, the Si-added steels had double oxide layers; the outer layer was a mixture of (Fe,Mn)O and (Fe,Mn)2SiO4 with an orthorhombic crystal structure and the inner layer was only (Fe,Mn)2SiO4. When the Si concentration increased, the (Fe,Mn)2SiO4 layer became thicker and the charged H concentration decreased. This result indicates that the (Fe,Mn)2SiO4 layer is effective in suppressing the permeation of H. Both the elongation loss (Eloss) and the area fraction of the brittle-fractured region increased with increasing Si concentration in the H-charged TWIP steels, particularly in the 3 wt.% Si steel, although the H concentration slightly decreased with increasing Si concentration. The H-charged Si-free and 1.5 wt.% Si steels underwent mechanical twinning and the migration of H atoms from lattices, dislocations and grain boundaries to mechanical twins during the SSRTs. The brittleness of both Si-free and 1.5 wt.% Si steels was caused by H-concentrated mechanical twins. The H-charged 3 wt.% Si steel underwent ε-martensitic transformation as well as mechanical twinning during the SSRT. H atoms migrated to mechanical twins until a strain of 0.24, and then inherited primarily into ε-martensite with further strain. The great Eloss of the H-charged 3 wt.% Si steel was caused mainly by H-concentrated ε-martensite.

Original languageEnglish
Pages (from-to)264-272
Number of pages9
JournalActa Materialia
Volume103
DOIs
Publication statusPublished - 2016 Jan 15

Fingerprint

Hydrogen embrittlement
Steel
Twinning
Plasticity
Strain rate
Elongation
Martensite
Crystal structure
Atoms
Thermal desorption
Martensitic transformations
Brittleness
Dislocations (crystals)
Permeation
Crystal lattices
Oxides
Grain boundaries

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Lee, Sang Min ; Park, Il Jeong ; Jung, Jae Gil ; Lee, Young Kook. / The effect of Si on hydrogen embrittlement of Fe-18Mn-0.6C-xSi twinning-induced plasticity steels. In: Acta Materialia. 2016 ; Vol. 103. pp. 264-272.
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title = "The effect of Si on hydrogen embrittlement of Fe-18Mn-0.6C-xSi twinning-induced plasticity steels",
abstract = "The hydrogen embrittlement (HE) of Fe-18Mn-0.6C-xSi (wt.{\%}) twinning-induced plasticity (TWIP) steels was investigated through slow strain rate tensile tests (SSRTs) and thermal desorption analyses of electrochemically H-charged specimens. Whereas the H-charged Si-free steel showed only the (Fe,Mn)O layer with a fcc crystal structure on the surface, the Si-added steels had double oxide layers; the outer layer was a mixture of (Fe,Mn)O and (Fe,Mn)2SiO4 with an orthorhombic crystal structure and the inner layer was only (Fe,Mn)2SiO4. When the Si concentration increased, the (Fe,Mn)2SiO4 layer became thicker and the charged H concentration decreased. This result indicates that the (Fe,Mn)2SiO4 layer is effective in suppressing the permeation of H. Both the elongation loss (Eloss) and the area fraction of the brittle-fractured region increased with increasing Si concentration in the H-charged TWIP steels, particularly in the 3 wt.{\%} Si steel, although the H concentration slightly decreased with increasing Si concentration. The H-charged Si-free and 1.5 wt.{\%} Si steels underwent mechanical twinning and the migration of H atoms from lattices, dislocations and grain boundaries to mechanical twins during the SSRTs. The brittleness of both Si-free and 1.5 wt.{\%} Si steels was caused by H-concentrated mechanical twins. The H-charged 3 wt.{\%} Si steel underwent ε-martensitic transformation as well as mechanical twinning during the SSRT. H atoms migrated to mechanical twins until a strain of 0.24, and then inherited primarily into ε-martensite with further strain. The great Eloss of the H-charged 3 wt.{\%} Si steel was caused mainly by H-concentrated ε-martensite.",
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The effect of Si on hydrogen embrittlement of Fe-18Mn-0.6C-xSi twinning-induced plasticity steels. / Lee, Sang Min; Park, Il Jeong; Jung, Jae Gil; Lee, Young Kook.

In: Acta Materialia, Vol. 103, 15.01.2016, p. 264-272.

Research output: Contribution to journalArticle

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T1 - The effect of Si on hydrogen embrittlement of Fe-18Mn-0.6C-xSi twinning-induced plasticity steels

AU - Lee, Sang Min

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AU - Lee, Young Kook

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AB - The hydrogen embrittlement (HE) of Fe-18Mn-0.6C-xSi (wt.%) twinning-induced plasticity (TWIP) steels was investigated through slow strain rate tensile tests (SSRTs) and thermal desorption analyses of electrochemically H-charged specimens. Whereas the H-charged Si-free steel showed only the (Fe,Mn)O layer with a fcc crystal structure on the surface, the Si-added steels had double oxide layers; the outer layer was a mixture of (Fe,Mn)O and (Fe,Mn)2SiO4 with an orthorhombic crystal structure and the inner layer was only (Fe,Mn)2SiO4. When the Si concentration increased, the (Fe,Mn)2SiO4 layer became thicker and the charged H concentration decreased. This result indicates that the (Fe,Mn)2SiO4 layer is effective in suppressing the permeation of H. Both the elongation loss (Eloss) and the area fraction of the brittle-fractured region increased with increasing Si concentration in the H-charged TWIP steels, particularly in the 3 wt.% Si steel, although the H concentration slightly decreased with increasing Si concentration. The H-charged Si-free and 1.5 wt.% Si steels underwent mechanical twinning and the migration of H atoms from lattices, dislocations and grain boundaries to mechanical twins during the SSRTs. The brittleness of both Si-free and 1.5 wt.% Si steels was caused by H-concentrated mechanical twins. The H-charged 3 wt.% Si steel underwent ε-martensitic transformation as well as mechanical twinning during the SSRT. H atoms migrated to mechanical twins until a strain of 0.24, and then inherited primarily into ε-martensite with further strain. The great Eloss of the H-charged 3 wt.% Si steel was caused mainly by H-concentrated ε-martensite.

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