Mechanical behaviour of hydrogen-charged Fe-Ni-Al alloys

Nataliya Yadzhak^1,2, Uwe Glatzel¹

¹ University of Bayreuth, Bayreuth, Germany

² Ivan Franko National University of Lviv, Lviv, Ukraine

Iron-based body-centred cubic Fe-Ni-Al alloys show potential for a range of industrial applications, yet their performance in hydrogen-rich environments remains underinvestigated. Since hydrogen diffuses into and accumulates within metallic materials, affecting their properties, an investigation of the hydrogen effect on this alloy is required. This study focuses on the fundamental investigation of the effects of hydrogen on the mechanical properties of three Fe-Ni-Al alloys with varying nickel and aluminium content. The alloys were cast using the vacuum induction melting method and further subjected to controlled heat treatment to achieve the desired microstructure of bcc Fe_ss matrix and cubic NiAl precipitates. In order to investigate the influence of hydrogen, the alloys were subjected to electrochemical hydrogen charging under different modes leading to a range of hydrogen concentrations. This factor was taken into account while studying hydrogen damage in the alloys with different microstructures. Mechanical properties of the alloys were investigated and brought in relation to the hydrogen charging time and intensity, resulting in different hydrogen concentrations.

Keywords: hydrogen embrittlement, hydrogen effect, iron-based alloys, mechanical properties.