Production of super steel by multi directional forging

多向锻造生产超级钢

• 批准号: 14550700
• 负责人: MIURA Hiromi
• 金额: $ 1.92万
• 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: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550700/
• 关键词: grain refinement; severe plastic deformation; malti directional forging; steel; precipitates; structure control; 結晶粒 微細化; 超微細粒; 熱的安定性; 第二相粒子; 動的回復; 鉄合金

Effect of large amount of dispersed particles on ultra-fine grain evolution severe deformation was investigated. For that purpose, austenitic stainless steels containing about 1 vol.% of second phase particles, which radii ranged from 30 to 70 nm, were multi-axially compressed at 637 and 873 K to a strain of ε=6.0 at maximum. Microstructure with nodes of dislocation walls or boundaries was gradually developed as strain increased. However, fine-grain evolution seemed to be stagnated by the presence of the fine particles when compared with the result of plain 304 stainless steel with no precipitates. Though ultra-fine grain evolution was not sharply took place even at ε=6.0, the grain size of the ultra-fine grains specifically evolved around deformation bands and microbands was about 0.5μm in average. Such microstructural evolution looked to be more obvious in the samples containing finer particles. This result suggests that recovery process is one of the most important factors on the ultra-fine grain evolution by severe plastic deformation.

研究了大量弥散颗粒对大变形超细晶演化的影响。为此，将含有约1vol.%第二相粒子的奥氏体不锈钢在637K和873K下进行多轴压缩，最大应变ε=6.0.随着应变的增加，以位错壁或晶界为节点的显微组织逐渐发展。然而，与没有析出物的普通304不锈钢相比，细小颗粒的存在似乎阻碍了细晶的演变。即使在ε=6.0时，超细晶的演化也不明显，但在变形带和微带附近特定演化的超细晶平均尺寸约为0.5μm。这种微观结构的演变在含有更细颗粒的样品中看起来更加明显。这一结果表明，回复过程是影响强塑性变形超细晶演化的重要因素之一。

项目成果

H.Miura, H.Hamaji, T.Sakai: "Microstructural Evolution during Severe Deformation in Austenitic Stainless Steal with Second Phase Particles"Advanced Engineering Materials. (in press). (2004)

H.Miura、H.Hamaji、T.Sakai：“带有第二相颗粒的奥氏体不锈钢剧烈变形过程中的微观结构演化”高级工程材料。

H.Miura, H.Hamaji, T.Sakai: "Microstructural Evolution during Severe Deformation in Austenitic Stainless Steel with Second Phase Particles"Advanced Engineering Materials. (in press). (2004)

H.Miura、H.Hamaji、T.Sakai：“带有第二相颗粒的奥氏体不锈钢剧烈变形过程中的微观结构演化”《先进工程材料》。

H.Miura, H.Hamaji, T.Sakai: "Microstructural Evolution during Severe Deformation in Austenitic Stainless Steel with Second Phase Particles"Advanced Engineering Materials. in press. (2004)

H.Miura、H.Hamaji、T.Sakai：“带有第二相颗粒的奥氏体不锈钢剧烈变形过程中的微观结构演化”《先进工程材料》。

H.Miura, H.Hamaji, T.Sakai: "Microstructural Evolution during Sever Deformation in Austenitic Stainless Steel with Second Phase Particles"Advanced Engineering Materials. (In press).

H.Miura、H.Hamaji、T.Sakai：“带有第二相颗粒的奥氏体不锈钢剧烈变形过程中的微观结构演化”《先进工程材料》。