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

• 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
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.12.004

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.