Effects of titanium content on hydrogen embrittlement susceptibility of hot-stamped boron steels

This study examines the effects of titanium content on hydrogen embrittlement in hot-stamped boron steel, by employing an electrochemical cathodic charging method, slow rate tensile tests, and thermal desorption analyses. With increasing titanium content in hot-stamped boron steel, titanium carbides...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-02, Vol.735, p.2067-2080
Main Authors: Kim, Hye-Jin, Jeon, Soon-Hyeok, Yang, Won-Seog, Yoo, Byung-Gil, Chung, Yoo-Dong, Ha, Heon-Young, Chung, Hyun-Young
Format: Article
Language:English
Subjects:
Boron
Boron steels
Charging
Desorption
Electrochemical reaction
Elongation
Hydrogen
Hydrogen embrittlement
Metals and alloys
Precipitates
Precipitation
Scanning electron microscopy, SEM
Tensile tests
Titanium carbide
Titanium catalysts
Transmission electron microscopy, TEM
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Summary:This study examines the effects of titanium content on hydrogen embrittlement in hot-stamped boron steel, by employing an electrochemical cathodic charging method, slow rate tensile tests, and thermal desorption analyses. With increasing titanium content in hot-stamped boron steel, titanium carbides are precipitated, while the resistance to hydrogen embrittlement improves with a slight reduction in the elongation when stress is applied to the hydrogen-charged specimens. The specimens with a high titanium content exhibit a relatively superior resistance to hydrogen embrittlement due to the presence of small titanium carbide precipitates that act as irreversible hydrogen trap sites with a high binding energy. •Ti content contributed refinement of prior austenite grain in hot-stamped boron steel.•The precipitation of Ti carbides was increased with the increase of Ti content.•Hydrogen embrittlement resistance was reinforced with the increase of Ti content.•TDS analysis show increase of irreversible hydrogen trapping in high Ti added alloy.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.12.004