Volume 4, Issue 1 (1-2017)                   WJEPAS 2017, 4(1): 1-6 | Back to browse issues page

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Silverstein R, Eliezer D. Hydrogen Effect on Duplex Stainless Steels at Very High Strain Rates. WJEPAS. 2017; 4 (1) :1-6
URL: http://europeansp.org/article-15-147-en.html
Department of material science and engineering, Ben-Gurion University of the Negev P.O.B 653, Beer-Sheva, Israel
Abstract:   (213 Views)
Due to their attractive combination of high strength along with great ductility, duplex stainless steels (DSS) are often being used as pressure vessels or underwater pipelines. Another aspect of their use can be reviewed for storing and transporting hydrogen, as a source for renewable energy. The use of DSS alloys in services combined hydrogen and mechanical load can lead to hydrogen embrittlement. The susceptibility to hydrogen embrittlement is directly related to the interaction between traps (microstructural defects) and hydrogen. Hydrogen effects are being studied by a thermal desorption spectrometry (TDS) process. In this research we determine the mechanical properties of DSS alloys with hydrogen at high strain rates (~105 s-1) and compare them to low strain rates (~10-7 s-1 ). The first process is being conducted using shock waves by dynamic experiments and the last using quasi-static by tensile loading machine. Dynamic experiments were applied for the first time to DSS alloys with and without hydrogen. The dynamic experiments include dynamic yield stress and spall (rapture) strength. Our results give new insight to the hydrogen embrittlement model regarding high strain rate and high dynamic pressures, ~1 GPa. In this research we prove that at high strain rates and 1 GPa dynamic pressure, the possible hydrogen failure model is still valid. Calculations performed by TDS showed ~40 % differences in trapping energies of quasi-static and dynamic experiments. Hydrogen trapping in the various defects and its effect on the mechanical properties are discussed in details.
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Received: 2019/08/8 | Accepted: 2019/08/8 | Published: 2019/08/8

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