Open Access
Article Number 03001
Number of page(s) 4
Section Principles, Simulations, Materials: Mathematical Modelling
Published online 01 September 2009
ESOMAT 2009, 03001 (2009)
DOI: 10.1051/esomat/200903001

The influence of hydrogen on martensitic transformation of austenitic steels

A.I. Balitskii, L.M. Ivaskevich and V.M. Mochulskyi

Department of Hydrogen Resistance of Materials Karpenko Physiko-Mechanical Institute National Academy of Sciences of Ukraine, 79601, Lviv, Ukraine

Published online: 1 September 2009

The effect of hydrogen on the mechanical properties of the quenched and deformed specimens of Cr-Ni and Cr-Mn steels in 293...773 K temperature range has been investigated. Non-hydrogenated and hydrogenated (623 Κ; 35 MPa H2; 5 h) polished plane specimens with 3×6×20 mm working part were subjected to static tension with displacement rate of 0,1 mm/min in helium and hydrogen under 35 MPa pressure. It was established that all tested steels are sensitive to hydrogen degradation. The maximum effect of hydrogen has observed at room temperature, when decreased the elongation and reduction of area of specimens. Martensitic transformation of nitrogen-containing austenite (stable on air) was caused by hydrogen. In unstable steels hydrogen change the intensity of γ-α transformation. Formation of polygonal dislocation substructure by preliminary mechanical or thermomechanical treatment decreases the hydrogen degradation of steels.

© Owned by the authors, published by EDP Sciences 2009