Investigation of correlation between local plastic deformation and microstructural factors in aggregated grains by means of non-destructive X-ray method in three-dimension

三维无损X射线方法研究聚集晶粒局部塑性变形与微观结构因素的相关性

• 批准号: 22H01809
• 负责人: 小林 正和
• 金额: $ 11.15万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22H01809/
• 关键词: 結晶粒; 局所塑性ひずみ; X線; トモグラフィ; 金属材料; 結晶組織; 局所ひずみ; 結晶方位依存性; 引張変形; 三次元; 不均一変形

塑性加工を受けた金属の微細構造の不均一な発達と局所的なひずみの発生は，その後の加工や再結晶，そして，亀裂の発生と成長などに影響するため非常に重要である。これまで，「不均一変形」と「不均一組織形成」について報告は，それぞれ，数多く為され，結晶粒組織の不均一な挙動は，結晶方位依存が主要因と広く信じられているが，未だもって，結晶粒組織中のどのような場所で局所的なひずみ集中が生じるのかは，明瞭に提示されていない。Al-4mass%Cu合金を試料とし，実験で得られたX線CTの三次元画像中のAl2Cu粒子位置を画像解析し，変形前後で同一の粒子を見つけることで，粒子間距離の変化から，局所的な3次元塑性ひずみを解析した。測定された塑性ひずみは，LabDCTで測定した初期の結晶粒組織の結晶方位と対比され，各結晶粒において，ひずみの平均値や標準偏差を求めた。加工硬化領域の約15%引張での解析をおこなった。相当塑性ひずみを代表値として，結晶粒サイズ，Taylor因子（塑性変形のし易さの指標），あるいは，粒界までの距離との相関関係を調査した。結晶粒サイズが大きいものは，比較的結晶粒内のひずみ差（標準偏差）が大きいかった。しかしながら，サイズやTaylor因子と，実際の塑性ひずみ量には，明確な相関関係が見られなかった。ひずみ集中と結晶組織との関係を注意深く検討したところ，隣接する結晶粒との変形能の差（例えば，Taylor因子の差）が重要であることが示唆された。ここまでの結果を論文で報告した。

The plastic processing is affected by the mechanical properties of the metal micromachine. it is very important that the mechanical properties of the metal are uniformly produced by the micromachine. after the plastic processing is completed, the growth of the crack is very important. The results show that the structure of the crystal structure is not uniform, and the orientation of the crystal structure is mainly due to the fact that the structure of the crystal is not uniform, and the orientation of the crystal is mainly due to the fact that the structure of the crystal is mainly due to the fact that the system in the crystal tissue is affected, and the results show that the system in the crystal tissue is very important. In the Al-4mass%Cu alloy, the position of Al2Cu particles is analyzed in the three-dimensional portrait of the X-ray CT, the same particles in front and back of the shape, the distance between the particles, the plasticity of the third dimension, and the plasticity of the third dimension. The plastic properties of the alloy were measured, and the orientation and orientation of the microstructure were determined by LabDCT. The average deviation of the standard deviation of each grain was calculated. The field of work hardening is about 15%. The equivalent plastic strain represents the temperature, the grain size, the Taylor factor, the grain boundary, and the grain boundary. The results showed that the grain size was much higher than that of the standard deviation (standard deviation). This is due to the fact that the Taylor factor is the most important factor, and that the plastic properties are very sensitive to each other. The focus of the microstructure is that the microstructure pays attention to the difference in the shape and energy of the grains (for example, the difference in Taylor factor). This is the result of the report report.