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SUMMARY:Hydrogen Embrittlement in a Fe-Mn-C Based Austenitic Steels
DTSTART:20190821T103000
DTEND:20190821T113000
DTSTAMP:20260610T113933Z
UID:26f98772e1c7149dca405ff58b6195a542d6995ad44b1052a5cd38af
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Burak BAL Department of Mechanical Engineering\, Abdullah 
 Gul University\, 38080 Kayseri\, Turkey   \nFe-Mn-C based austenitic stee
 ls show excellent combination of tensile strength (>1 GPa) and ductility (
 >60%) due to high strain hardening rate associated with deformation twinni
 ng of a face centered cubic (FCC) structure\, microstructural interactions
  during plastic deformation and dynamic strain aging. Having FCC crystal p
 rovides large solubility and low diffusion coefficient of hydrogen. Theref
 ore\, they are potential materials for hydrogen-related infrastructure (i.
 e\, storage\, transportation\, energy conversion). However\, it has been o
 bserved that they are also susceptible to catastrophic hydrogen-related fa
 ilure\, often called as hydrogen embrittlement (HE) or hydrogen-delayed fr
 acture (HDF). Therefore\, better understanding of the mechanism of HE in F
 e-Mn-C based austenitic steels is of utmost importance to use them in hydr
 ogen- related infrastructures safely. The main factors\, responsible for s
 usceptibility of materials for HE\, are 1) Mechanical (HE is linearly prop
 ortional to strength of material)\, Material (Microstructure\, crystal str
 ucture\, etc) and Environmental (Pressure\, temperature\, exposure time\, 
 etc).\nIn this study\, the effects of strain rate on the HE susceptibility
  of twinning induced plasticity (TWIP) steel\, a kind of Fe-Mn-C based aus
 tenitic steel\, were investigated by tensile testing at room temperature a
 nd microstructural characterization. Hydrogen was introduced into the spec
 imens by electrochemical hydrogen charging. Microstructural investigations
  were conducted using in-situ scanning electron microscopy\, transmission 
 electron microscopy and electron backscatter diffraction to observe the ef
 fects of hydrogen on microstructure during deformation. It was observed th
 at hydrogen enhanced the microstructural interactions and slip localizatio
 n during plastic deformation and HE is more pronounced at low strain rates
 . In addition\, hydrogen charging did not change the average dislocation d
 ensity considerably but changed the average twin thickness and fracture mo
 de from ductile to quasi-cleavage at a low strain rate. Consequently\, new
  HE mechanism was proposed based on these observations.
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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