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.

研究了不锈钢粉末在热粉车压制过程中的致密化和组织演变。用预热的氧化铝颗粒作为传压介质，将预热的粉末预制件真空包裹在硼硅酸盐玻璃中，在钢模中压制。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。在压制过程中发现了三个显微组织特征：枝晶组织的溶解、再结晶和正常的晶粒长大，而这又主要取决于预热温度。研究发现，在再结晶阶段形成亚微米级的显微组织。用压力烧结图的概念讨论了现有压制工艺的致密化机理。

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。