Research on Hybrid Peening and Its Application for Suppression of Hydrogen Embrittlement

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360040
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Tohoku University
• Principal Investigator: SOYAMA Hitoshi 東北大学, 工学(系)研究科(研究院), 教授 (90211995)
• Co-Investigator(Kenkyū-buntansha): IGA Yuka 東北大学, 流体科学研究所, 准教授 (50375119) ; TAKAKUWA Osamu 東北大学, 大学院工学研究科, 助教 (60633518) ; AOYAGI Yoshiteru 東北大学, 大学院工学研究科, 准教授 (70433737)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 表面改質 / ピーニング / キャビテーション / 水素脆化 / 疲労亀裂進展 / 応力拡大係数 / パルスレーザ / 表面力学

Outline of Final Research Achievements

In order to suppress of hydrogen embrittlement of metallic materials, which is an obstacle to realize hydrogen society, “hybrid peening” was established. Here, “hybrid peening” means a mechanical surface treatment which combined with different peening method such cavitation peening, laser peening and shot peening. In the present research, suppression of hydrogen embrittlement of chrome molybdenum steel and stainless steel by the peening was demonstrated by experimentally. It was also revealed that the peening reduced invention of hydrogen into metallic materials by introducing compressive residual stress into the materials and the peening suppressed the hydrogen embrittlement of the metallic materials.

Free Research Field

知的計測評価学