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Hydrogen Trapping Behavior in Vanadium Microalloyed TRIP-Assisted Annealed Martensitic Steel

1
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China
3
School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 741; https://doi.org/10.3390/met9070741
Received: 26 May 2019 / Revised: 27 June 2019 / Accepted: 29 June 2019 / Published: 30 June 2019
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Abstract

Transformation induced plasticity (TRIP)-assisted annealed martensitic (TAM) steel combines higher tensile strength and elogangtion, and has been increasingly used but appears to bemore prone to hydrogen embrittlement (HE). In this paper, the hydrogen trapping behavior and HE of TRIP-assisted annealed martensitic steels with different vanadium additions had been investigated by means of hydrogen charging and slow strain rate tensile tests (SSRT), microstructral observartion, and thermal desorption mass spectroscope (TDS). Hydrogen charging test results indicates that apparent hydrogen diffusive index Da is 1.94 × 10−7/cm2·s−1 for 0.21 wt.% vanadium steel, while the value is 8.05 × 10−7/cm2·s−1 for V-free steel. SSRT results show that the hydrogen induced ductility loss ID is 76.2% for 0.21 wt.%V steel, compared with 86.5% for V-free steel. The trapping mechanism of the steel containing different V contents is analyzed by means of TDS and Transmission electron microscope (TEM) observations. It is found out that the steel containing 0.21 wt.%V can create much more traps for hydrogen trapping compared with lower V steel, which is due to vanadium carbide (VC) precipitates acting as traps capturing hydrogen atoms.The relationship between hydrogen diffusion and hydrogentrapping mechanism is discussed in details. View Full-Text
Keywords: TRIP-assisted annealed martensitic steel; hydrogen embrittlement; hydrogen trapping; thermal desorption spectroscope TRIP-assisted annealed martensitic steel; hydrogen embrittlement; hydrogen trapping; thermal desorption spectroscope
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Yang, X.; Yu, H.; Song, C.; Li, L. Hydrogen Trapping Behavior in Vanadium Microalloyed TRIP-Assisted Annealed Martensitic Steel. Metals 2019, 9, 741.

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