Intercritical annealing temperature dependence of hydrogen embrittlement behavior of cold-rolled Al-containing medium-Mn steel |
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| Affiliation: | 1. Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, PR China;2. China Aero-Polytechnology Establishment, Beijing 100028, PR China;1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;2. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China;3. The State Key Laboratory of Rolling & Automation, Northeastern University, Shenyang 110819, China;4. Research Institute of Science and Technology, Northeastern University, Shenyang 110819, China;1. State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang, Liaoning, 110819, China;2. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, Liaoning, 110819, China;3. Laboratory for Excellent in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at EI Paso, TX, 79968-0521, USA;1. Research and Development Division, Tata Steel, Jamshedpur 831007, India;2. Materials Science and Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;1. Department of Mining and Materials Engineering, McGill University, 3610 University Street, Montreal, QC, Canada H3A 0C5;2. Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany;3. Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;4. CanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON, Canada L8P 0A5 |
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| Abstract: | The present investigation attempts to evaluate the influence of intercritical annealing temperature (TIA) on the hydrogen embrittlement (HE) of a cold-rolled Al-containing medium-Mn steel (Fe-0.2C-4.88Mn-3.11Al-0.62Si) by using electrochemical hydrogen-charging, slow strain rate tensile test and scanning electron microscope. The results show that an excellent combination of strength and ductility (the product of ultimate tensile strength and total elongation) up to ∼53 GPa·% was obtained for the specimen intercritically annealed at an intermediate temperature of 730 °C, whereas the HE index increases significantly with an increase in TIA up to 850 °C. Being different from the typical dimple ductile fracture for the uncharged specimen, the hydrogen-charged specimen exhibits a mixed brittle interface decohesion and ductile intragranular fracture mode in the crack initiation region and the brittle fracture fraction increases with increasing TIA. Both the stability and amount of austenite play a critical role in governing the HE behavior of TRIP-assisted medium-Mn steel. Thus, it is suggested that suitable TIA should be explored to guarantee the safety service of automotive parts made of this type of steel in addition to acquiring excellent mechanical properties. |
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| Keywords: | Hydrogen embrittlement Medium-Mn steel Intercritical annealing temperature Austenite stability |
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