1988 Fiscal Year Final Research Report Summary
Hot Powder Vehicle Compaction of an Atomized Stainless Steel Powder
| Project/Area Number |
62550496
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属加工(含鋳造)
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
WATANABE Ryuzo Professor, Faculty of Eng., Tohoku University, 工学部, 教授 (20005341)
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| Project Period (FY) |
1987 – 1988
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| Keywords | Hot powder vehicle compaction / Full-densification / Stainless steel powder / 完全緻密化 / 塑性流動 / 超微細組織 |
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| Research Abstract |
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.
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