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Hydrogen Effects in Prestrained Transformation Induced Plasticity Steel

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Abstract

Thermal desorption analysis (TDA) was performed on laboratory heat-treated transformation induced plasticity (TRIP) steel with 14.5 pct retained austenite (RA), ultimate tensile strength (UTS) of 880 MPa, and elongation to failure of 33 pct. Samples were tensile prestrained 5 pct at 253 K (–20 °C), 296 K (23 °C), and 375 K (102 °C) to generate different amounts of deformation-induced martensite, 10.5, 5.5, and 0.5 pct, respectively, prior to cathodically charging to a hydrogen content of 1 to 2 ppm. TDA was performed on charged samples to determine the location and strength of hydrogen trapping sites. TDA results suggest that dislocations were the main trapping sites in prestrained TRIP steel. The TDA peak intensity increased with prestrain, suggesting that the quantity of hydrogen trap sites increased with deformation. Tensile tests were performed on the four hydrogen-charged TRIP steel conditions. As confirmed with transmission electron microscope images, samples with more homogeneous dislocation distributions (i.e., prestrained at 375 K (102 °C)) exhibited greater resistance to hydrogen embrittlement than samples that included a high dislocation density adjacent to the formations of strain-induced martensite (i.e., samples prestrained at 253 K (–20 °C) and 296 K (23 °C)).

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Notes

  1. LECO is a trademark of LECO Corporation, St. Joseph, MI.

  2. VICI® is a registered trademark of Valco Instruments Co. Inc. and VICI AG, Houston, TX.

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Acknowledgments

Part of this work was performed by one of the authors (JR) at the Graduate Institute of Ferrous Technology (GIFT), Pohang Institute of Science and Technology, University in Pohang, and the authors thank GIFT for their support. This work was partially supported by the IMI Program of the National Science Foundation under Award No. DMR 0843934. The authors are also grateful for the support of the Advanced Steel Processing and Products Research Center, an industry/university cooperative research center at the Colorado School of Mines.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Advanced Steel Processing and Products Research Center, Colorado School of Mines, 1500 Illinois Street, Golden, CO, 80401, USA

    J. A. Ronevich (Graduate Student), J. G. Speer (Professor), E. De Moor (Research Professor) & D. K. Matlock (Director)

  2. Materials Design Laboratory, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, South Korea

    B. C. De Cooman (Professor)

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  1. J. A. Ronevich
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  2. B. C. De Cooman
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  3. J. G. Speer
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  4. E. De Moor
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  5. D. K. Matlock
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Correspondence to J. A. Ronevich.

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Manuscript submitted June 20, 2011.

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Ronevich, J.A., De Cooman, B.C., Speer, J.G. et al. Hydrogen Effects in Prestrained Transformation Induced Plasticity Steel. Metall Mater Trans A 43, 2293–2301 (2012). https://doi.org/10.1007/s11661-011-1075-3

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