Impact of precipitates on the hydrogen embrittlement behavior of a V-alloyed medium-manganese austenitic stainless steel

• DOI: 10.1016/j.jmrt.2020.09.085
• Publication Date: 2020-10-04T02:31:31Z
• Authors: Tarek Allam; Xiaofei Guo; Marta Lipińska-Ch...; Atef Hamada; Essam Ahmed; Wolfgang Bleck
• Keywords: Thermal desorption; Austenitic stainless steel

This paper discusses the avoidance of hydrogen embrittlement (HE) in a medium manganese stainless steel X20CrNiMnVN18-5-10. We adopted HE-mitigation strategy that relies on improving its intrinsic resistance to by adjusting an ultrafine microstructure (∼1.3 µm) containing significant amount nano-sized V- and Cr-based precipitates size range 20 - ≥200 nm. The precipitation state was characterized using high-resolution scanning transmission electron microscope. Slow strain rate tests at 10−6 s−1 were conducted specimens with/without pre-charging evaluate HE susceptibility. Thermal desorption analysis applied explore trapping behavior cold-rolled, annealed pre-charged states. Hydrogen uptake behaviors show dependence precipitates. It is remarked large trap larger higher temperature peak than small do. high-temperature peaks (>400 °C) indicate observed provide irreversible sites, where occurs. investigated X20CrNiMnVN18-5-10 demonstrates enhanced comparison high as well steels. findings suggest engineering with sufficient number traps ultrafine-grained appropriate mitigation allows designing hydrogen-resistant advanced strength