Presentation Information
[22p-A309-6]Observation of hydrogen embrittlement cracking by local plasma irradiation in SEM
〇Akimitsu Hatta1, Kota Tomatsu2, Tomohiko Omura2, Kenji Kobayashi2, Takahiro Aoki2 (1.Kochi Univ. Technol., 2.Nippon Steel Corp.)
Keywords:
microplasma,hydrogen embrittlement
Hydrogen micro gas jet is locally supplied through a stainless steel nozzle with a micro-orifice tip into the vacuum chamber of SEM. SEM observation is carried out with flowing hydrogen gas into the chamber with evacuation using a turbo molecular pump installed on the chamber. A pulsed high voltage is applied to the nozzle to generate a local micro-discharge hydrogen plasma between the nozzle (anode) and the sample (ground/cathode). Cracks caused by hydrogen embrittlement were confirmed in the metal samples by hydrogen plasma irradiation.