Abstract
The effect of high-pressure torsion (HPT) and annealing on hydrogen embrittlement (HE) of a type 304 stainless steel was studied by metallographic characterization and tensile test after hydrogen gas charging. A volume fraction of ~78 pct of the austenite transformed to α′ martensite by the HPT processing at an equivalent strain of ~30. Annealing the HPT-processed specimen at a temperature of 873 K (600 °C) for 0.5 hours decreased the α′ martensite to ~31 pct with the average grain size reduced to ~0.43 μm through the reverse austenitic transformation. Hydrogen charge into the HPT-processed and the HPT+annealed specimens in the hydrogen content of ~10 to 20 ppm led to no severe HE but appeared in the solution-treated specimen. Especially the 873 K (600 °C) annealed specimen had the ~1.4 GPa tensile strength and the ~50 pct reduction of area (RA) despite the hydrogenation.
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Acknowledgments
This research has been supported by the NEDO, Fundamental Research Project on Advanced Hydrogen Science (2006 to 2012). Portions of this research are included in Kyushu University Interdisciplinary Programs in Education and Projects in Research Development (P&P).
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Manuscript submitted February 17, 2010.
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Mine, Y., Tachibana, K. & Horita, Z. Effect of High-Pressure Torsion Processing and Annealing on Hydrogen Embrittlement of Type 304 Metastable Austenitic Stainless Steel. Metall Mater Trans A 41, 3110–3120 (2010). https://doi.org/10.1007/s11661-010-0394-0
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DOI: https://doi.org/10.1007/s11661-010-0394-0