Hydrogen delayed fracture properties and internal hydrogen behavior of a Fe-18Mn-1.5AI-0.6C TWIP steel

Kyoung Ho So, Ji Soo Kim, Young Soo Chun, Kyung Tae Park, Young Kook Lee, Chong Soo Lee

Research output: Contribution to journalArticle

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Abstract

The hydrogen delayed fracture (HDF) properties and internal hydrogen behavior were investigated in a Fe-18Mn-1.5AI-0.6C steel, a representative twinning induced plasticity (TWIP) aided steel. Slow strain rate tests (SSRT) were employed on both smooth and notched specimens to evaluate the effects of diffusible hydrogen on the HDF properties of the steel. Results showed that the fracture stress, fracture strain and time to fracture of the hydrogen pre-charged specimens were relatively insensitive to the amount of diffusible hydrogen. Fracture surface exhibited a ductile dimple fracture mode regardless of the diffusible hydrogen concentration. It was found that most hydrogen became non-diffusible after SSRT The major trapping sites of hydrogen were dislocations, grain boundaries and twins. The activation energies for detrapping of hydrogen were estimated 35 kJ/mol for dislocations or grain boundaries, and 62 kJ/mol for twins. A comparison of the HDF properties of the present steel with those of other high strength steels revealed that the TWIP steel appeared to be relatively immune to hydrogen delayed fracture. This was due to the combined effects of (a) higher hydrogen solubility of austenite matrix (b) negligible portion of diffusible hydrogen to the total hydrogen, (c) decrease of diffusible hydrogen content during the deformation, and (d) no transformation of austenite to either e or a′ martensite.

Original languageEnglish
Pages (from-to)1952-1959
Number of pages8
JournalISIJ International
Volume49
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1

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Steel
Twinning
Plasticity
Hydrogen
Dislocations (crystals)
Austenite
Strain rate
Grain boundaries
Ductile fracture
High strength steel
Martensite

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

So, Kyoung Ho ; Kim, Ji Soo ; Chun, Young Soo ; Park, Kyung Tae ; Lee, Young Kook ; Lee, Chong Soo. / Hydrogen delayed fracture properties and internal hydrogen behavior of a Fe-18Mn-1.5AI-0.6C TWIP steel. In: ISIJ International. 2009 ; Vol. 49, No. 12. pp. 1952-1959.
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abstract = "The hydrogen delayed fracture (HDF) properties and internal hydrogen behavior were investigated in a Fe-18Mn-1.5AI-0.6C steel, a representative twinning induced plasticity (TWIP) aided steel. Slow strain rate tests (SSRT) were employed on both smooth and notched specimens to evaluate the effects of diffusible hydrogen on the HDF properties of the steel. Results showed that the fracture stress, fracture strain and time to fracture of the hydrogen pre-charged specimens were relatively insensitive to the amount of diffusible hydrogen. Fracture surface exhibited a ductile dimple fracture mode regardless of the diffusible hydrogen concentration. It was found that most hydrogen became non-diffusible after SSRT The major trapping sites of hydrogen were dislocations, grain boundaries and twins. The activation energies for detrapping of hydrogen were estimated 35 kJ/mol for dislocations or grain boundaries, and 62 kJ/mol for twins. A comparison of the HDF properties of the present steel with those of other high strength steels revealed that the TWIP steel appeared to be relatively immune to hydrogen delayed fracture. This was due to the combined effects of (a) higher hydrogen solubility of austenite matrix (b) negligible portion of diffusible hydrogen to the total hydrogen, (c) decrease of diffusible hydrogen content during the deformation, and (d) no transformation of austenite to either e or a′ martensite.",
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Hydrogen delayed fracture properties and internal hydrogen behavior of a Fe-18Mn-1.5AI-0.6C TWIP steel. / So, Kyoung Ho; Kim, Ji Soo; Chun, Young Soo; Park, Kyung Tae; Lee, Young Kook; Lee, Chong Soo.

In: ISIJ International, Vol. 49, No. 12, 01.12.2009, p. 1952-1959.

Research output: Contribution to journalArticle

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