Accelerated grain refinement induced by dispersed coarse particles

粗颗粒分散加速晶粒细化

• 批准号: 18560674
• 负责人: MIURA Hiromi
• 金额: $ 2.42万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560674/
• 关键词: Severe plastic deformation; multi-directional forging; hot deformation; stimulation; grain refinement; Ni-Fe alloy; coarse particle; Ni-Fe合金; 粗大粒子; 微細化促進

A Ni-30 mass% Fe alloy with dispersed coarse oxide particles, ranging from 1 to 3 μm in diameter, was multi-directionally forged (MDF) at temperatures between 773 K and 873 K at a true strain rate of 1 × 10^<-3> s^<-1> in vacuum. For comparison, a particle-free Ni-Fe alloy was also prepared and MDFed. At 873 K, an obvious flow softening occurred during MDF especially in the alloy with dispersed particles, while work hardening followed by steady-state flow appeared at 773 K in both alloys. With increasing cumulative strain, the average grain size became gradually finer. However, the evolved microstructure was quite different depending on temperature and dispersion of particles. At 873 K, in the alloy with particles, equi-axed fine grains of about 1.3 μm in average was uniformly evolved at a cumulative strain ofΣε=2.4, while at 773 K the microstructure was still inhomogeneous. The above experimental results suggest important role of coarse particles to stimulate grain refinement.

具有分散的粗氧化物颗粒（直径范围为 1 至 3 μm）的 Ni-30 质量% Fe 合金，在 773 K 至 873 K 的温度下以 1 × 10^< 的真实应变速率进行多向锻造 (MDF) -3> s^<-1> 在真空中，还制备了无颗粒的Ni-Fe合金并在873 K下进行MDF，特别是在MDF过程中发生了明显的流动软化。在具有分散颗粒的合金中，两种合金在 773 K 时均出现加工硬化和稳态流动，随着累积应变的增加，平均晶粒尺寸逐渐变细，但是，根据温度和分散性，演变的微观结构有很大不同。 873 K 时，含颗粒合金中均匀析出平均约 1.3 μm 的等轴细晶，累积应变 Σε=2.4，而 773 K 时，颗粒合金中均匀析出平均约 1.3 μm 的等轴细晶。微观结构仍然不均匀。上述实验结果表明粗颗粒对于促进晶粒细化具有重要作用。

项目成果

Accelerated Evolution of Ultrafine Grains by Coarse Particles during Multi-Directional Forging of Ni-Fe alloy

Ni-Fe合金多向锻造过程中粗颗粒加速超细晶粒演化

• 发表时间: 2007
• 作者: H. Miura;T. Ueno;T. Sakai;N. Fujita;N. Yoshinaga
• 通讯作者: N. Yoshinaga

温間多軸鍛造中の粗大分散粒子によるNi-Fe合金の結晶粒超微細化の促進

粗分散颗粒温多轴锻造促进Ni-Fe合金超细晶粒细化

• 发表时间: 2007
• 作者: 三浦博己;他4名
• 通讯作者: 他4名

Stimulated Grain Refinement in Ni-Fe Alloy by Coarse Particles, during Warm Multi-Directional Forging

温多向锻造过程中粗颗粒促进镍铁合金晶粒细化

• 发表时间: 2007
• 期刊: Materials Science Forum Vol. 550
• 作者: H. Miura;T. Sakai;T. Ueno;N. Fujita;N. Yoshinaga
• 通讯作者: N. Yoshinaga

分散強化型Ni-Fe合金の温間強ひずみ加工と結晶粒微細化

弥散强化Ni-Fe合金的温强应变加工及晶粒细化

• 发表时间: 2007
• 作者: 上野太郎;他4名
• 通讯作者: 他4名

stimulated Grain Refinement in Ni-Fe Alloy by Coarse Particles during Warm Multi-Directional Forging

温多向锻造过程中粗颗粒促进镍铁合金晶粒细化

• 发表时间: 2007
• 期刊: Materials Science Forum Vol. 550
• 作者: H. Miura;et al.
• 通讯作者: et al.