Experimental investigation on the role of grain boundary in fatigue crack propagation of Ni-base suepralloys

晶界在镍基合金疲劳裂纹扩展中作用的实验研究

• 批准号: 24760073
• 负责人: SAKAGUCHI Motoki
• 金额: $ 2.83万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24760073/
• 关键词: 疲労; 破壊力学; 耐熱材料; き裂進展; 疲労き裂進展; 耐熱超合金; 結晶粒界; Ni基超合金

Fatigue crack propagation in thin-wall superalloys were experimentally investigated at room temperature, employing miniature compact tension (CT) specimens directly extracted from as-cast Ni-base superalloys. At first, the effect of crystallographic orientation on the fatigue crack propagation was investigated, using a single crystal (SC) Ni-base superalloy with different primary orientations. Based on the test result of the SC specimens, some significant interactions between the crack and grain boundaries were discussed, using a directionally solidified (DS) superalloy. It was found from a series of experiments that the Stage I fatigue crack propagation rate in both SC and DS superalloys were significantly affected by the primary crystallographic orientation and the vicinity of the grain boundaries.

采用直接从铸态镍基高温合金中提取的小型紧凑拉伸（CT）试样，在室温下对薄壁高温合金的疲劳裂纹扩展进行了实验研究。首先，研究了晶体取向对镍基单晶高温合金疲劳裂纹扩展的影响。根据定向凝固高温合金SC试样的试验结果，讨论了裂纹与晶界之间的一些重要相互作用。从一系列的实验中发现，SC和DS高温合金的第I阶段疲劳裂纹扩展速率显着影响的主要晶体取向和晶界附近。

项目成果

Fatigue crack propagation in thin-wall superalloys component; experimental investigation via miniature CT specimens

薄壁高温合金部件中的疲劳裂纹扩展；

• 发表时间: 2012
• 期刊: Suepralloys 2012
• 作者: Motoki SAKAGUCHI;Takeshi TSURU;Masakazu OKAZAKI
• 通讯作者: Masakazu OKAZAKI

耐熱超合金の第I段階疲労き裂進展についての実験的検討

耐热高温合金I阶段疲劳裂纹扩展实验研究

• 发表时间: 2014
• 作者: Y. Mizuno;T. Arima;S. Taniguchi and M. Sugiyama;阪口基己,神山大知,木村俊之,井上裕嗣
• 通讯作者: 阪口基己,神山大知,木村俊之,井上裕嗣

Roles of plastic and creep strains in the directional coarsening of a Ni-base singel crystal superalloy

塑性和蠕变应变在镍基单晶高温合金定向粗化中的作用

• 发表时间: 2013
• 作者: 吉村忍;小林敬;秋葉博;鈴木智;荻野正雄;Motoki SAKAGUCHI
• 通讯作者: Motoki SAKAGUCHI

Ni基超合金における第I段階疲労き裂進展に関する実験的検討

镍基高温合金I阶段疲劳裂纹扩展实验研究

• 期刊: 日本機械学科論文集
• 作者: T. Arima;S. Taniguchi;T. Ruggeri and M. Sugiyama;阪口基己,井上裕嗣,岡崎正和
• 通讯作者: 阪口基己,井上裕嗣,岡崎正和

Roles of plastic and creep strains in the direc- tional coarsening of a Ni-base single crystal sup- eralloy

塑性和蠕变应变在镍基单晶高温合金定向粗化中的作用

• 发表时间: 2013
• 作者: M. Sakaguchi;M. IKE;M. Okazaki
• 通讯作者: M. Okazaki