Hydrogen Embrittlement of Duplex Steel Tested Using Slow Strain Rate Test

P. Vaňová, J. Sojka. VŠB Technical u niversity of O strava, FMME, Ostrava, Czech Republic This paper is dealing with hydrogen embrittlement of austenitic-ferritic 2205 duplex steel using the slow strain rate test (SSRT). The original material was subjec ted to heat treatment under 700 °C during 5 hours and f ollowing aircooling with the aim of pr ovoking sigma phase pr ecipitation and embrittlement of the mat erial. The samples of both states were electrolytic saturation with hydrogen in 0,1N solution of sulfuric acid (H 2SO4) with addition KSCN during 24 hours. The hydrogen embrittlement appeared on fracture surfaces of tested tensile bars as a quasi-cleavage damage on their perimet er. From the established depth of h ydrogen charging the diff usion coeffi cient of hydrogen in duplex st eel with ferritic-austenitic structure and with the struc ture containing the sigma phase as w ell were estimated.