2026年1月8日、Asst Prof. Eason (Yi-sheng) Chenよるご講演が第184回構材ゼミとして開催されました。
日時：2026年1月8日（木曜日）11：00-12：00
場所：NIMS千現地区 先進構造材料研究棟5階カンファレンスルーム
講演題目：Atom probe tomography and micromechanics for understanding hydrogen embrittlement in steels
講演者：Asst Prof. Eason (Yi-sheng) Chen , School of Materials Science and Engineering, Nanyang
Technological University (NTU), Singapore
開催者：佐々木 泰祐（微細組織解析グループ）
講演後の集合写真
Prof. Eason Chen（前列 右から5番目）
Abstract:
Hydrogen embrittlement poses a significant challenge to the durability of structural steels essential for the hydrogen economy. Understanding the interaction between hydrogen and materials plays a crucial role to address this issue. As such, the research in my group dedicates to characterizing how hydrogen distributes in material microstructure and the related embrittling and anti-embrittling effects. We aim to establish the microstructure-property-processing relationships of materials in the presence of hydrogen, which leads to the development of safe and long-lasting infrastructure in the hydrogen economy.
In this presentation, I will give an overview about hydrogen embrittlement and what have been achieved in my group for several major research outcomes [1-5]. I will shed light on the validation of the influence of hydrogen trapping on reducing the susceptibility of hydrogen embrittlement, using cold-drawn high-strength pearlitic steels as a model system. By using atom probe tomography, equipped with a cryogenic sample handling workflow, in combination with hydrogen-charging mechanical testing and transmission electron microscopy, we found the high-strength steels containing a specific type of dislocation strong hydrogen traps are less susceptible to hydrogen embrittlement. The result is informative for gas pipeline sectors when using pearlite in their steel pipes.
References [1] P.-Y. Liu et al., Nature Communication, 15, 724 (2024).
[2] R. Niu et al., Acta Materialia, 281, 120327 (2024).
[3] Y.-S. Chen et al., International Journal of Hydrogen Energy, 136, 789-821 (2024).
[4] Y.-S. Chen et al., Science, 367, 171-175 (2020).
[5] Y.-S. Chen et al., Science, 355, 1196-1199 (2017).