Fabrication of partially stabilized austenitic steel with high strength and performance against hydrogen embrittlement

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630352
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Kyushu University
• Principal Investigator: Takaki Setsuo 九州大学, 工学(系)研究科(研究院), 教授 (90150490)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 鉄鋼材料

Outline of Final Research Achievements

In this study, the stabilization of surface austenite layer was attempted by applying the solid nitrogen absorption treatment in order to realize the high strength and performance against hydrogen embrittlement in a conventional austenitic stainless steel (SUS 304). As a result, it was found that 1) the austenite phase containing 0.4% or more is stable even after 60% cold working, 2) the stable austenite layer plays a role to retard the hydrogen absorption from the surface, 3) the center potion of material has been strengthened to a high level by the deformation induced martensitic transformation. As expected in the initial research plan, a high strength stainless steel with high performance against hydrogen embrittlement could be fabricated by applying the solid nitrogen absorption treatment to SUS 304.

Free Research Field

鉄鋼材料