报告1题目：Hydrogen Safety—Part 1：Basic science of hydrogen embrittlement
报告2题目：Hydrogen Safety—Part 2：Prevention of hydrogen embrittlement
报 告 人：Prof.Kiyoshi Yokogawa（日本产业技术综合研究所）
报告时间：2021年10月22日下午14:30-16:30、10月29日下午14:30-16:30
会议方式：腾讯会议（会议号: 440 314 221）
欢迎广大师生踊跃参加!
机械与汽车工程学院
2021年10月12日
报告1摘要：
Hydrogen energy is expected to improve the climate of the Earth. New hydrogen technology, in particular fuel cell vehicle (FCV) using high-pressure hydrogen storage, is developed. Hydrogen embrittlement (HE) of metallic materials to be used in hydrogen production, storage, transportation and utilization is important for public safety of not only hydrogen energy industry but also current chemical industry, oil refinery and ammonia synthesis using hydrogen. HE was discovered in 19th century, since then, many studies have been conducted. HE is classified into 3 categories, one is internal reversible HE, another is hydrogen gas embrittlement, the other is hydrogen reaction embrittlement. HE evaluation methods, i.e. mechanical testing, hydrogen diffusion, hydrogen analysis, and computational calculations are shown with our experiences.Based on these studies, several HE mechanisms have been proposed.Main mechanisms, i.e. hydrogen-enhanced localized plasticity theory (HELP) and hydrogen-enhanced strain-induced vacancy theory (HESIV) are described in details.
报告2摘要：
Fuel cell vehicle (FCV) is developed and commercially available in the market. FCV uses high-pressure hydrogen storage tank on board and hydrogen station also supplies high-pressure hydrogen into FCV. Application of HE for FCV and hydrogen station to prevent the accidents is discussed, i.e. hydrogen compatibility and hydrogen suitability are introduced to establish the mechanical design for high-pressure hydrogen storage.
Hydrogen has been used in current chemical industry, oil refinery and ammonia synthesis from early 20th century.Many accidents have occurred in the industries, thus the application of HE is discussed to prevent the accidents, i.e. Nelson diagram for hydrogen attack and the strength limit of the component materials for delayed fracture are described in details.
报告人简介：
Kiyoshi Yokogawa，博士，日本产业技术综合研究所教授，是国际顶级的氢脆专家，取得了一系列处于国际领先水平的研究成果：首次发现氢致微裂纹起源于应变诱导马氏体富集区和奥氏体富集区的边界，而非传统认为的应变诱导马氏体，为揭示亚稳态奥氏体不锈钢的氢脆机理奠定了重要基础；基于分子动力学，建立了高压氢气环境中Ni基金属材料的塑性变形分析模型；首次发现石墨化炭纳米结构的环状超结构和5 圆环原子图像，揭示了炭纳米纤维的结构。多次应邀到美国、德国、韩国讲学。在国际刊物发表高水平论文110余篇，获授权专利12项（其中美国专利3项，日本专利9项），出版相关专著6本。获日本金属学会突出贡献奖、韩国机械学会突出贡献奖。
