Surface Treatments for the Suppression of Hydrogen Absorption into Steels

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14434
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Tohoku University
• Principal Investigator: SUGAWARA YU 東北大学, 工学研究科, 助教 (40599057)
• Co-Investigator(Kenkyū-buntansha): 武藤 泉 東北大学, 工学研究科, 教授 (20400278)
• Research Collaborator: KUDO Tomohiro ; HAYASHI Tomoki
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 窒化処理 / 水素透過 / プラズマ窒化 / 水素脆化 / マルテンサイト

Outline of Final Research Achievements

In order to suppress hydrogen absorption into steels, we tried to form the formation of nitrided layer on surfaces of the pure iron specimens using plasma nitriding because nitrogen is an interstitial element similar to hydrogen. It is found that the iron specimen with nitrogen compound layers composed of Fe2-3N and Fe4N on the surface showed much lower hydrogen permeability than the untreated specimen. In addition, nitrogen martensite layer formed by plasma nitriding and subsequent quenching slightly suppressed hydrogen permeation in the iron specimen.

Free Research Field

材料電子化学