Hydrogen-Assisted Fracture Mechanisms in Ultrafine-Grained CrNi Austenitic Stainless Steels with Different Initial Microstructures

Abstract:

We investigated the effect of electrolytic hydrogen-charging on regularities of plastic flow, strength and fracture mechanisms of AISI 316L and 321 austenitic stainless steels. In the steels, an ultrafine-grained structure of various morphologies was formed using methods of warm abc-pressing and thermomechanical treatment (cold rolling and annealing). Hydrogen-charging of ultrafine-grained steels reduces their yield strength and elongation. The high dislocation density and low-angle boundaries inhibit the effects of hydrogen embrittlement in 316L and 321 steels.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 370-375
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.370
• Online since: December 2018
• Authors: Sergey V. Astafurov*, Elena G. Astafurova, Valentina A. Moskvina, Galina G. Maier, Eugene V. Melnikov, Il'ya V. Ratochka, Ivan P. Mishin, Anastasiya Fortuna, Gennady Zakharov
• Keywords: Austenitic Steel, Fracture, High-Temperature Abc-Pressing, Hydrogen Embrittlement, Rolling, Ultrafine-Grained Structure

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