Effects of crystal microstructure on residual stress relaxation

晶体微观结构对残余应力松弛的影响

• 批准号: 23360061
• 负责人: AKITA Koichi
• 金额: $ 11.81万
• 依托单位: Japan Atomic Energy Agency
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23360061/
• 关键词: 残留応力緩和; ショットピーニング; レーザーピーニング; 中性子回折; X線回折プロファイル解析; ピーニング; 転位密度; 機械的負荷

Peening techniques, such as shot-peening and laser-peening, introduce compressive residual stresses in the surface layer of metallic materials. The compressive residual stress is effective for preventing stress corrosion cracking and fatigue fracture, therefore the peening techniques have been applied to power plant structures. However, the compressive residual stress might decrease due to thermal and/or mechanical loading in service, and it reduces the benefit.In this study, the relaxation behavior of the compressive residual stress due to mechanical and thermal cyclic loading were investigated by in-situ neutron diffraction techniques. Also, the microstructures introduced by shot-peening and laser-peening were observed by an X-ray diffraction line profile analysis, and the relationships between the microstructures and the relaxation behavior of the compressive residual stress were discussed.

喷丸技术，例如喷丸和激光喷丸，在金属材料的表面层中引入压缩残余应力。残余压应力对防止应力腐蚀开裂和疲劳断裂是有效的，因此喷丸技术已被应用于电站结构。然而，压缩残余应力可能会减少，由于在服务中的热和/或机械加载，它降低了效益，在这项研究中，由于机械和热循环加载的压缩残余应力的松弛行为进行了研究，在原位中子衍射技术。通过X射线衍射线轮廓分析，观察了喷丸和激光喷丸后的显微组织，并讨论了显微组织与残余压应力松弛行为之间的关系。

项目成果

Relaxation of Peening Residual Stress during Mechanical Loading

机械加载过程中喷丸残余应力的松弛

• 发表时间: 2012
• 作者: K.Akita;K.Takeda and Y.Sano
• 通讯作者: K.Takeda and Y.Sano

X-ray diffraction study on microstructures of shot/laser-peened AISI316 stainless steel

• DOI: 10.1016/j.jnucmat.2013.07.010
• 发表时间: 2013-11
• 期刊: Journal of Nuclear Materials
• 影响因子: 3.1
• 作者: M. Kumagai;K. Akita;Y. Itano;M. Imafuku;S. Ohya

X-Ray Line Profile Study on Shot/Laser-Peened Stainless Steel

• DOI: 10.4028/www.scientific.net/amr.996.39
• 发表时间: 2014-08
• 期刊: Advanced Materials Research
• 作者: M. Kumagai;K. Akita;M. Imafuku;S. Ohya

Relaxation Behavior of Laser-Peening Residual Stress under Tensile Loading Investigated by X-ray and Neutron Diffraction

X射线和中子衍射研究拉伸载荷下激光喷丸残余应力的松弛行为

• 期刊: Mechanical Engineering journal
• 影响因子: 0.5
• 作者: Koichi AKITA;Kengo HAYASHI;Kazuya TAKEDA;Yuji SANO;Hiroshi SUZUKI;Atsushi MORIAI and Shin-ichi OHYA
• 通讯作者: Atsushi MORIAI and Shin-ichi OHYA

異材溶接継手における熱サイクル中その場中性子応力測定

异种金属焊接接头热循环过程中的原位中子应力测量

• 发表时间: 2013
• 作者: 秋田貢一;西川聡;柴原正和;生島一樹;鈴木裕士;盛合敦;Harjo/Stefanus;相澤一也
• 通讯作者: 相澤一也