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Home Material Sciences Hydrogen-Resistant Austenitic Steels

Hydrogen-Resistant Austenitic Steels

Description

The proposal concerns development of engineering materials for service in hydrogenating environments. The approach is based on the electronic concept of hydrogen embrittlement (HE), studies of atomic interaction between hydrogen and alloying elements in steel and the effect of alloying elements on hydrogen migration, hydrogen-induced phase transformations and mechanical properties of hydrogenated steels. It is shown that a reason for HE is the hydrogen-caused increase in the concentration of free electrons leading to a striking decrease of the shear module, which results in a strongly modified mechanism of plastic deformation leading to pseudo-brittle fracture. The developed concept is applicable for all not hydride-forming metals.The knowledge of optimal chemical compositions of hydrogen-resistant austenitic steels is obtained from the studies of Me-H bonding energies in the solid solution, mobility of dislocations, hydrogen migration enthalpy and hydrogen-induced phase transformations in relation to mechanical properties. It is shown that

  • nickel, be the widely used (and very expensive) alloying element in austenitic steels, is harmful for hydrogen resistance,
  • alloying with elements increasing hydrogen migration enthalpy in steel is useful for hydrogen resistance,
  • alloying with elements enhancing the hydrogen-induced fcc --> hcp transformation is a promising way to develop hydrogen-resistant steel.

Innovative Aspect and Main Advantages

Cost-effective high-strength nonmagnetic austenitic steel with increased resistance to hydrogen brittleness.


Fig. 1 Stress-strain curve of hydrogen-free and hydrogen-
charged steels. Effect of Ni in a model steel


Fig. 2 Effect of chemical composition on hydrogen migration
enthalpy and hydrogen embrittlement of austenitic steels

Areas of Application

Automotive, aircraft, chemical and other industries

Stage of Development

Development phase – laboratory tested

Contact Details

Institute for Metal Physics of the National Academy of Sciences of Ukraine
36, Vernadsky str., Kyiv, 03142, Ukraine
Prof. Valentin Gavriljuk
Tel +380-44-424-3310
Fax +380-44-424-3310
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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