|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Hydrogen Embrittlement and Hydrogen-enhanced Strain-induced Vacancies in α-iron
||Yuya Matsumoto, Nami Kurihara, Hiroshi Suzuki, Kenichi Takai
|On-Site Speaker (Planned)
Clarifying states of hydrogen present in iron and steel is important in order to understand hydrogen embrittlement mechanisms and develop materials with high resistance to hydrogen embrittlement. Though it is widely recognized that fracture strain of iron and steel decreased with increasing the amount of hydrogen, it has not been understood that hydrogen affects the decrease in fracture strain directly or not. Therefore, the objective is to clarify the atomic-scale changes in α-iron specimen strained with hydrogen. A thermal desorption spectroscopy which can heat from lower temperature (L-TDS) was used to separate peak temperatures and hydrogen states corresponding to various lattice defects in α-iron. The L-TDS results show that new hydrogen trap sites in α-iron specimen strained with hydrogen were enhanced compared with that without hydrogen. These sites were not dislocations but hydrogen-enhanced strain-induced vacancies since these sites were annihilated during aging at 30 °C.
||Planned: Supplemental Proceedings volume