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2 2024

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Impact of hydrogen charging techniques on hydrogen embrittlement behavior of s960mc ahs steel

Straková Denisa, Novy Frantisek, Šikyňa Lukáš

System Safety : Human - Technical Facility - Environment

2024

Vol. 6, iss. 1

270--276

The study explores the influence of hydrogen embrittlement on advanced highstrength steel S960MC, focusing on the role of different hydrogen charging techniques. Hydrogen embrittlement poses a critical challenge in high-strength steels, compromising their structural integrity and limiting their applications in demanding environments. The findings indicate that S960MC steel demonstrates intrinsic resistance to hydrogen embrittlement when exposed to a hydrogen-supersaturated environment without external factors like electric current or elevated temperature. However, cathodic hydrogen charging significantly enhances hydrogen diffusion into the material, leading up to a 60% decrease in ultimate tensile strength. In contrast, immersion hydrogen charging showed a minimal effect on the mechanical properties. Fractographic analysis showed that cathodic charging led to severe embrittlement, characterized by mixed transcrystalline quasicleavage, intercrystalline fractures, and extensive secondary cracking. Conversely, immersion charging resulted in negligible embrittlement, with minimal changes in fracture morphology. These results highlight the critical role of hydrogen charging methods in the embrittlement behavior of S960MC steel, emphasizing the substantial impact of cathodic charging on material degradation.

Hydrogen embrittlement of ferritic steel 1.4104

Šikyňa Lukáš, Straková Denisa, Nový František

System Safety : Human - Technical Facility - Environment

2024

Vol. 6, iss. 1

209--217

The primary goal of this study was to investigate laboratory techniques for hydrogenating selected steels and to examine the hydrogen embrittlement of steel 1.4104. These processes, which involve hydrogenation and subsequent mechanical testing, are rarely performed in laboratories due to the need for precise, costly equipment and the inherent risks associated with hydrogen's highly reactive and explosive nature. Various theories have been proposed to explain the mechanisms behind hydrogen embrittlement in steels. These theories attribute material degradation to hydrogen’s interaction with the steel microstructure. However, their applicability is often limited, as they are developed for specific conditions and may not fully describe the phenomenon under different scenarios. This work focused on hydrogenating steel 1.4104 using two distinct methods: immersion and cathodic. The aim was to induce embrittlement and compare the resulting fracture surfaces, particularly after conducting Charpy impact tests, to evaluate the effects of each hydrogenation method.