Near-Threshold Fatigue Crack Growth Characteristics and Quantitative Evaluation of Relevant Fracture Surface of Directionally Solidified Superalloy in a Vacuum at Elevated Temperatures

高温真空定向凝固高温合金近阈值疲劳裂纹扩展特性及相关断口定量评价

• 批准号: 20560074
• 负责人: TSUJI Masahiro
• 金额: $ 3万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20560074/
• 关键词: 高温疲労; 下限界; 見かけの下限界; 真空中; 破壊力学; 破面解析; 一方向凝固超合金; 荷重波形依存性; 通常凝固超合金; 荷重周波数依存性

Fatigue crack growth experiments in the near-threshold region were conducted in a vacuum and in the air for directionally solidified Ni-based superalloy at elevated temperature. The so-called "apparent threshold" behavior occurred by K_<max> increased, and it was found that the crack growth behaviors below that had the temperature, loading frequency, and loading waveform dependences. Observations of fracture surfaces after those experiments were made by AFM. Fractal analysis was applied to the data and quantitative evaluations for those fracture surfaces were attempted. It was found that fractal dimensions increased as K_<max> increased in a vacuum.

对定向凝固镍基高温合金在真空和空气中进行了近门槛区疲劳裂纹扩展试验。随着K_（？）的增加，裂纹扩展出现“表观门槛值”现象<max>，低于该值时，裂纹扩展行为与温度、加载频率和加载波形有关。通过AFM观察这些实验后的断裂表面。分形分析应用于数据和定量评价这些断裂表面的尝试。结果表明，在真空条件下，分形维数随K的增大而增大<max>.

项目成果

Ni基超合金材の大気中および真空中における下限界近傍の高温疲労き裂進展挙動の周波数依存性

镍基高温合金材料在空气和真空中接近下限的高温疲劳裂纹扩展行为的频率依赖性

• 发表时间: 2010
• 作者: 小谷昌弘;佐藤充朗;辻昌宏;久保司郎;佐藤充朗
• 通讯作者: 佐藤充朗

真空中および大気中におけるニッケル基超合金の下限界近傍高温疲労き裂進展挙動の繰り返し速度依存性

真空和空气中镍基高温合金下限附近高温疲劳裂纹扩展行为的重复率依赖性

• 发表时间: 2010
• 期刊: 日本機械学会M&M2010材料力学カンファレンスCD-ROM論文集 CD-ROM
• 作者: 小谷昌弘;佐藤充朗;久保 司郎;辻昌宏
• 通讯作者: 辻昌宏

ニッケル基超合金の真空中および大気中における高温疲労き裂進展挙動

镍基高温合金在真空和空气中的高温疲劳裂纹扩展行为

• 发表时间: 2008
• 作者: 山下敦史;佐藤充朗;辻昌宏;久保司郎
• 通讯作者: 久保司郎