Role of Grain Boundary in Stress Corrosion Cracking based upon Elastic-Plastic Fracture Machanics

• Project/Area Number: 23560078
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Tohoku University
• Principal Investigator: LU Zhanpeng 東北大学, 未来科学技術共同研究センター, 客員教授 (30419999)
• Co-Investigator(Kenkyū-buntansha): SHOJI Tetsuo 東北大学, 未来科学技術共同研究センター, 教授 (80091700) ; TAKEDA Yoichi 東北大学, 大学院工学研究科, 准教授 (40374970)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 弾塑性 / 応力腐食割れ / 環境強度 / 結晶粒界 / 高温水 / き裂進展

Research Abstract

Stress corrosion cracking growth rates of Alloy 182 weld metals in T-S and T-L orientations in 288oC pure water with various dissolved oxygen and hydrogen concentrations were measured. High angle random boundaries are dominant in Alloy 182. Extensive inter-dendritic stress corrosion cracking paths on the side surfaces and fracture surfaces of both T-S and T-L orientation specimens. Crack growth rates of the T-S specimen are significantly higher than those of the T-L specimen. The crack growth path in the T-S orientation specimen is apparently perpendicular to the applied loading direction, which appears to be parallel to the loading direction in the T-L specimen. The crack growth rate decreased significantly with decreasing dissolved oxygen concentration.

Research Products

• [Journal Article] Deterministic formulation of the effect of stress intensity factor on PWSCC of Ni-base alloys (2013)
  • Author(s): Z.P. Lu, T. Shoji, H. Xue, C.Y. Fu
  • Journal Title: Pressure Vessel Technology Volume: 135 Issue: 2 Pages: 21402-21402
  • DOI: 10.1115/1.4007471
  • Peer Reviewed
• [Journal Article] Characterization of microstructure, local deformation and microchemistry in Alloy 600 heat-affected zone and stress corrosion cracking in high temperature water (2012)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji, Seiya Yamazaki, Kazuhiro Ogawa
  • Journal Title: Corrosion Science Volume: Vol.58 Pages: 211-228
  • DOI: 10.1016/j.corsci.2012.01.029
  • Peer Reviewed
• [Journal Article] Synergistic effects of local strain-hardening and dissolved oxygen on stress corrosion cracking of 316NG weld heat-affected zones in simulated BWR environments (2012)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji, He Xue, Fanjiang Meng, Chaoyang Fu, Yoichi Takeda, Koji Negishi
  • Journal Title: J. Nuclear Materials Volume: Vol.423 Issue: 1-3 Pages: 28-39
  • DOI: 10.1016/j.jnucmat.2011.12.030
  • Peer Reviewed
• [Presentation] Effects of dendrite orientation and water chemistry on stress corrosion cracking path and kinetics of Alloy 182 weld metal in high-temperature water (2013)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji
  • Organizer: 16th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors
  • Place of Presentation: USA
• [Presentation] Effects of Prior-deformation and Water Chemistry on Stress Corrosion Cracking of Austenitic Alloys In High Temperature Water (2013)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji, Shuang Xia, Meiyi Yao, Bangxin Zhou
  • Organizer: 21th International Conference on Nuclear Engineering (ICONE21)
  • Place of Presentation: China
• [Presentation] Effects of Prior-deformation and Water Chemistry on Stress Corrosion Cracking of Austenitic Alloys in High Temperature Water (2013)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji, Shuang Xia, Meiyi Yao, Bangxin Zhou
  • Organizer: 21th International Conference on Nuclear Engineering (ICONE21)
  • Place of Presentation: Chengdu, Sichuan, China
• [Presentation] Effects of dendrite orientation and water chemistry on stress corrosion cracking path and kinetics of Alloy 182 weld metal in high-temperature water (2013)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji
  • Organizer: 16th Inter. Conf. Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors
  • Place of Presentation: Asheville, North Carolina, USA
• [Presentation] Deformation Mode and Microstructure on Stress Corrosion Cracking Path and Kinetics in High Temperature Water Environments (2011)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji, Seiya Yamazaki, Fanjiang Meng, Tichun Dan, Yoichi Takeda, Koji Negishi
  • Organizer: 15^<th> International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors
  • Place of Presentation: USA
• [Presentation] Mechanistic Formulation of PWSCC Growth Rates of Ni-Base Alloys and Weld Metals (2011)
  • Author(s): Zhanpeng Lu, Tetsuo Shoji, He Xue and Chaoyang Fu
  • Organizer: ASME 2011 Pressure Vessels and Piping Conference
  • Place of Presentation: USA
• [Presentation] Mechanistic formulation of PWSCC growth rates of Ni-Base alloys and weld Metals. 2011 ASME Pressure Vessels and Piping Division Conference (2011)
  • Author(s): Z.P. Lu,et al.
  • Organizer: 2011 ASME Pressure Vessels and Piping Division Conference
  • Place of Presentation: Baltimore, USA
• [Presentation] Deformation mode and microstructure on stress corrosion cracking path and kinetics in high temperature water Environments, (2011)
  • Author(s): Z.P. Lu,et al
  • Organizer: 15th Int. Conf. Environ. Degradation of Materials in Nuclear Power Systems -Water Reactors
  • Place of Presentation: Colorado, USA