Investigation into the degradation mechanism of environmental embrittlement using integrated in-situ nano mechanical testing

• Project/Area Number: 20360054
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Osaka University
• Principal Investigator: MINOSHIMA Kohji Osaka University, 工学研究科, 教授 (50174107)
• Co-Investigator(Kenkyū-buntansha): HIRAKATA Hiroyuki 大阪大学, 工学研究科, 准教授 (40362454) ; YONEZU Akio 大阪大学, 工学研究科, 助教 (40398566)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥19,890,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥4,590,000); Fiscal Year 2010: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2009: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2008: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
• Keywords: その場観察 / ナノメカニカルテスティング / 水素ぜい化 / 高強度材料 / 塑性特性 / 環境ぜい化

Research Abstract

In the light of plastic deformation at nano scale, this study investigated the mechanism of hydrogen embrittlement which is caused by hydrogen diffusion into a material. Nano indentation applying to high strength steels and model materials revealed that hydrogen absorption enhanced plastic deformation. This finding was also observed in the interfacial fracture toughness test, indicating that plastic deformation of thin film (which surrounds crack propagation) was promoted by hydrogen absorption, leading the variation in apparent fracture toughness.

Research Products

• [Journal Article] Influence of activation energy and sensitivity to hydrogen embrittlement on fatigue strength degradation by irreversible hydrogen in high-strength steels (2011)
  • Author(s): 中谷正憲, 箕島弘二
  • Journal Title: Fatigue & Fracture of Engineering Materials and Structures Vol 34, Issue 5 Pages: 363-373
  • Peer Reviewed
• [Journal Article] Fatigue Strength Degradation by Irreversible Hydrogen in Cold Drawn Eutectoid Steels (2011)
  • Author(s): 中谷正憲, 箕島弘二
  • Journal Title: Key Engineering Materials Vols.462-463 Pages: 188-193
  • Peer Reviewed
• [Journal Article] 非拡散性水素吸蔵条件下における伸線強加工高強度鋼の疲労き裂進展特性と脱離水素の可視化 (2010)
  • Author(s): 中谷正憲, 藤原弘章, 崎原雅之, 箕島弘二
  • Journal Title: 日本機械学会論文集A編 Vol.76, No.769 Pages: 1214-1220
  • NAID: 110007730357
  • Peer Reviewed
• [Journal Article] Hydrogen Effect on Fracture Toughness of Thin Film/Substrate Interfaces (2010)
  • Author(s): Hiroyuki Hirakata, Takeshi Yamada, Yoshiki Nobuhara, Akio Yonezu, Kohji Minoshima
  • Journal Title: Engineering Fracture Mechanics Vol.77 Pages: 803-818
  • Peer Reviewed
• [Journal Article] On Hydrogen-induced Vickers Indentation Cracking in High-strength Steel (2010)
  • Author(s): Akio Yonezu, Masanori Arino, Toshiyuki Kondo, Hiroyuki Hirakata, Kohji Minoshima
  • Journal Title: Mechanics Research Communications Vol.37 Pages: 230-234
  • Peer Reviewed
• [Journal Article] 非拡散性水素吸蔵条件下における伸線強加工高強度鋼の疲労き裂進展特性と脱離水素の可視化 (2010)
  • Author(s): 中谷正憲, 藤原弘章, 崎原雅之, 箕島弘二
  • Journal Title: 日本機械学会論文集A編 Volume: 76 Pages: 1214-1220
  • NAID: 110007730357
  • Peer Reviewed
• [Journal Article] Hydrogen Effect on Fracture Toughness of Thin Film/Substrate Interfaces (2010)
  • Author(s): Hiroyuki Hirakata
  • Journal Title: Engineering Fracture Mechanics Vol.77 Pages: 803-818
  • Peer Reviewed
• [Journal Article] Oh Hydrogen-Induced Vickers Indentation Cracking in High-Strength Steel (2010)
  • Author(s): Akio Yonezu
  • Journal Title: Mechanics Research Communications (印刷中)
  • Peer Reviewed
• [Presentation] 非拡散性水素脱離による高強度鋼の疲労き裂進展の加速と脱離の力学条件 (2010)
  • Author(s): 中谷正憲, 藤原弘章, 崎原雅之, 箕島弘二
  • Organizer: 疲労シンポジウム
  • Place of Presentation: 高知城ホール(高知市)
  • Year and Date: 2010-10-28
• [Presentation] 伸線強加工高強度鋼の疲労き裂進展特性に及ぼす非拡散性水素の影響と脱離水素の可視化 (2010)
  • Author(s): 中谷正憲, 藤原弘章, 崎原雅之, 箕島弘二
  • Organizer: CAMP-ISIJシンポジウム「水素脆化研究の基盤構築を目指して」
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2010-09-26
• [Presentation] Evaluation of Susceptibility to Hydrogen Embrittlement Cracking in High Strength Steel using Indentation Test (2009)
  • Author(s): 米津明生, 有野雅規, 近藤俊之, 平方寛之, 箕島弘二
  • Organizer: 2009 ASME International Mechanical Engineering Congress & Exposition.
  • Place of Presentation: Orland, FL
  • Year and Date: 2009-11-17
• [Presentation] Acoustic Emission from Hydrogen Embrittlement Cracking in Maraging Steel subjected to Contact Loading (2009)
  • Author(s): 米津明生, 有野雅規, 近藤俊之, 平方寛之, 箕島弘二
  • Organizer: The 13th Asia-Pacific Conference on Non-Destructive Testing.
  • Place of Presentation: Yokohama
  • Year and Date: 2009-11-14
• [Presentation] 押込み法による水素ぜい化き裂発生強度特性の評価 (2009)
  • Author(s): 米津明生, 有野雅規, 近藤俊之, 平方寛之, 箕島弘二
  • Organizer: 腐食防食協会材料と環境討論会
  • Year and Date: 2009-09-28
• [Presentation] 押込み法による水素ぜい化き裂発生強度特性の評価 (2009)
  • Author(s): 米津明生
  • Organizer: 腐食防食協会第56回材料と環境討論会
  • Place of Presentation: 大阪府立大学(堺市)
  • Year and Date: 2009-09-28
• [Presentation] 局所接触負荷による高強度鋼の水素ぜい化破壊機構 (2009)
  • Author(s): 米津明生, 有野雅規, 近藤俊之, 平方寛之, 箕島弘二
  • Organizer: 日本機械学会M&M2009
  • Year and Date: 2009-07-26
• [Presentation] 局所接触負荷による高強度鋼の水素ぜい化破壊機構 (2009)
  • Author(s): 米津明生
  • Organizer: 日本機械学会M&M2009材料力学カンファレンス
  • Place of Presentation: 札幌コンベンションセンター(札幌市)
  • Year and Date: 2009-07-26
• [Presentation] ナノ塑性特性に及ぼす吸蔵水素の影響 (2009)
  • Author(s): 近藤俊之, 米津明生, 平方寛之, 箕島弘二
  • Organizer: 日本機械学会関西支部第84期定時総会講演会
  • Year and Date: 2009-03-16
• [Presentation] ナノ薄膜と基板の界面破壊じん性に及ぼす吸蔵水素の影響 (2009)
  • Author(s): 山田剛司, 延原由起, 崎原雅之, 平方寛之, 箕島弘二
  • Organizer: 日本機械学会関西支部第84期定時総会講演会
  • Year and Date: 2009-03-16
• [Presentation] ナノ塑性特性に及ぼす吸蔵水素の影響 (2009)
  • Author(s): 近藤 俊之
  • Organizer: 日本機械学会関西支部第84期定時総会講演会
  • Place of Presentation: 近畿大学本部キャンパス
  • Year and Date: 2009-03-16
• [Presentation] ナノ薄膜と基板の界面破壊じん性に及ぼす吸蔵水素の影響 (2009)
  • Author(s): 山田 剛司
  • Organizer: 日本機械学会関西支部第84期定時総会講演会
  • Place of Presentation: 近畿大学本部キャンパス
  • Year and Date: 2009-03-16
• [Remarks] ホームページ等
  • URL: http://www-micro.mech.eng.osaka-u.ac.jp/home.html