Hot Powder Vehicle Compaction of an Atomized Stainless Steel Powder

雾化不锈钢粉末的热粉末载体压实

• 批准号: 62550496
• 负责人: WATANABE Ryuzo
• 金额: $ 1.15万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550496/
• 关键词: Hot powder vehicle compaction; Full-densification; Stainless steel powder; 完全緻密化; 塑性流動; 超微細組織; 擬HIP法; ステンレス鋼粉; 等方圧付加熱間成形; ステンレス綱粉; 高速度綱粉; 結晶粒成長抑制効果

Densification and microstructural development of stainless steel powder during hot powder vehicle compaction was investigated. The preheated powder preform, vacuum encapsuled in a borosilicate glass, was compacted in a steel die using preheatedalumina granules as a pressure transmitting medium. The condition for the full-densification was determined as a function of pressure and temperature. The increase in pressure was more effective than in temperature. Three microstructural features were odserved during the compacting process; Solutioning of dendritic structure, recrystallization and normal grain growth, which in turn was found to be mainly dependent of preheating temperature. It has been found that a submicron-sized microstructure is formed during the recrystallization stage. the densification mechanism of the present compaction process has been discussed on a concept of pressure sintering map.

研究了热粉末载体压制过程中不锈钢粉末的致密化和微观结构的发展。将预热的粉末预制件真空封装在硼硅酸盐玻璃中，并使用预热的氧化铝颗粒作为压力传递介质在钢模中压实。完全致密化的条件被确定为压力和温度的函数。压力的增加比温度的增加更有效。在压实过程中观察到三个微观结构特征：枝晶结构的固溶、再结晶和正常晶粒生长，而这又主要取决于预热温度。已经发现，在再结晶阶段形成亚微米尺寸的微观结构。目前的压实过程的致密化机制已经在压力烧结图的概念上进行了讨论。

项目成果

宮島雅文、川崎亮、渡辺龍三: 日本金属学会誌.

Masafumi Miyajima、Ryo Kawasaki、Ryuzo Watanabe：日本金属学会杂志。