Abstract
A deformation of a tempered martensitic structure (i.e., tempforming) at 773 K (500 °C) was applied to a 0.6 pct C-2 pct Si-1 pct Cr steel. The hydrogen embrittlement (HE) property of the tempformed (TF) steel was investigated by a slow strain rate test (SSRT) and an accelerated atmospheric corrosion test (AACT). Hydrogen content within the samples after SSRT and AACT was measured by thermal desorption spectrometry (TDS). The tempforming at 773 K (500 °C) using multipass caliber rolling with an accumulative are reduction of 76 pct resulted in the evolution of an ultrafine elongated grain (UFEG) structure with a strong 〈110〉//rolling direction (RD) fiber deformation texture and a dispersion of spheroidized cementite particles. The SSRT of the pre-hydrogen-charged notched specimens and the AACT demonstrated that the TF sample had superior potential for HE resistance to the conventional quenched and tempered (QT) sample at a tensile strength of 1500 MPa. The TDS analysis also indicated that the hydrogen might be mainly trapped by reversible trapping sites such as grain boundaries and dislocations in the TF sample, and the hydrogen trapping states of the TF sample were similar to those of the QT sample. The QT sample exhibited hydrogen-induced intergranular fracture along the boundaries of coarse prior-austenite grains. In contrast, the hydrogen-induced cracking occurred in association with the UFEG structure in the TF sample, leading to the higher HE resistance of the TF sample.
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Acknowledgment
The authors thank Mr. Kuroda and Mr. Taniuchi for the materials processing with caliber-rolling, Ms. Hirota for her help with the TDS analysis, and Dr. Kameda for his suggestions for this study. The study for the QT samples was carried out as a part of research activities of Fundamental Studies on Technologies for Steel Materials with Enhanced Strength and Functions by the Consortium of The Japan Research and Development Center of Metals and the New Energy and Industrial Technology Development Organization. The study for the TF sample was partly supported by the Iketani Science and Technology Foundation and by the Japan Science and Technology Agency under collaborative research based on industrial demand Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials.
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Nie, Y., Kimura, Y., Inoue, T. et al. Hydrogen Embrittlement of a 1500-MPa Tensile Strength Level Steel with an Ultrafine Elongated Grain Structure. Metall Mater Trans A 43, 1670–1687 (2012). https://doi.org/10.1007/s11661-011-0974-7
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DOI: https://doi.org/10.1007/s11661-011-0974-7