Role of e{open} martensite in tensile properties and hydrogen degradation of high-Mn steels

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

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Abstract

Effects of e{open} martensite on tensile properties and hydrogen degradation behaviors of a high Mn steel were investigated. For this purpose, a Fe-15Mn-2Cr-0.6C steel containing various amount of e{open} martensite was prepared and tensile tested at room temperature. Microstructures were examined by electron back scattered diffraction and transmission electron microscopy. Then, a series of electrochemical hydrogen pre-charging, slow strain rate tests, and thermal desorption spectrometry (TDS) analyses was conducted to examine the hydrogen degradation behaviors. Deformation of the steel without e{open} martensite (i.e. fully austenitic) was dominated by slip and mechanical twinning, but that of the steel containing e{open} martensite was mainly attributed to transformation induced plasticity in association with strain induced martensitic transformation during deformation, resulting in higher work hardening rate. However, tensile strength and elongation on the steel containing e{open} martensite were lower than those of the fully austenitic steel, since cracks were prone to be initiated and propagated at the region of e{open} martensite which is harder than austenite. Furthermore, it was found that e{open} martensite provided many diffusible hydrogen trapping sites. Consequently, the notch fracture stress of the steel containing e{open} martensite decreased significantly as the diffusible hydrogen content increased. The activation energy for hydrogen detrapping from its trapping sites was also calculated by means of the TDS analyses, ∼22. kJ/mol for the γ/e{open} interfaces, and ∼37. kJ/mol for dislocations/γ grain boundaries.

Original languageEnglish
Pages (from-to)87-95
Number of pages9
JournalMaterials Science and Engineering A
Volume533
DOIs
Publication statusPublished - 2012 Jan 30

Fingerprint

Steel
tensile properties
martensite
Tensile properties
Martensite
Hydrogen
steels
degradation
Degradation
hydrogen
Thermal desorption
Spectrometry
desorption
trapping
mechanical twinning
work hardening
Austenitic steel
Twinning
Martensitic transformations
martensitic transformation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Chun, Young Soo ; Kim, Ji Soo ; Park, Kyung Tae ; Lee, Young Kook ; Lee, Chong Soo. / Role of e{open} martensite in tensile properties and hydrogen degradation of high-Mn steels. In: Materials Science and Engineering A. 2012 ; Vol. 533. pp. 87-95.
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Role of e{open} martensite in tensile properties and hydrogen degradation of high-Mn steels. / Chun, Young Soo; Kim, Ji Soo; Park, Kyung Tae; Lee, Young Kook; Lee, Chong Soo.

In: Materials Science and Engineering A, Vol. 533, 30.01.2012, p. 87-95.

Research output: Contribution to journalArticle

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AU - Chun, Young Soo

AU - Kim, Ji Soo

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AB - Effects of e{open} martensite on tensile properties and hydrogen degradation behaviors of a high Mn steel were investigated. For this purpose, a Fe-15Mn-2Cr-0.6C steel containing various amount of e{open} martensite was prepared and tensile tested at room temperature. Microstructures were examined by electron back scattered diffraction and transmission electron microscopy. Then, a series of electrochemical hydrogen pre-charging, slow strain rate tests, and thermal desorption spectrometry (TDS) analyses was conducted to examine the hydrogen degradation behaviors. Deformation of the steel without e{open} martensite (i.e. fully austenitic) was dominated by slip and mechanical twinning, but that of the steel containing e{open} martensite was mainly attributed to transformation induced plasticity in association with strain induced martensitic transformation during deformation, resulting in higher work hardening rate. However, tensile strength and elongation on the steel containing e{open} martensite were lower than those of the fully austenitic steel, since cracks were prone to be initiated and propagated at the region of e{open} martensite which is harder than austenite. Furthermore, it was found that e{open} martensite provided many diffusible hydrogen trapping sites. Consequently, the notch fracture stress of the steel containing e{open} martensite decreased significantly as the diffusible hydrogen content increased. The activation energy for hydrogen detrapping from its trapping sites was also calculated by means of the TDS analyses, ∼22. kJ/mol for the γ/e{open} interfaces, and ∼37. kJ/mol for dislocations/γ grain boundaries.

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