1996 Fiscal Year Final Research Report Summary
Development of high functional materials with nanoscale structure by combined process of MA treatment and powder consolidation with underwater shock wave
| Project/Area Number |
08455339
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | KUMAMOTO UNIVERSITY |
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Principal Investigator |
CHIBA Akira Kumamoto Univ., Fac.of Engr., Prof., 工学部, 教授 (90005322)
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| Co-Investigator(Kenkyū-buntansha) |
HOKAMOTO Kazuyuki Kumamoto Univ., Fac.of Engr., Assoc.Prof., 工学部, 助教授 (70199462)
NISHIDA Minoru Kumamoto Univ., Fac.of Engr., Assoc.Prof., 工学部, 助教授 (90183540)
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| Project Period (FY) |
1996
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| Keywords | Mechanical alloying / Underwater-shock wave / Austenitic stainless steel / Functional materials / nano-scale structure / Grain refining / Deformation induced martensite / powder consolidation |
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| Research Abstract |
Commercially available SUS304L powders (powder size ; 44mum) and the powders mixed with Fe, Ni, or Cu powders were mechanically alloyed at first, and then the powders were consolidated by cylindrical axisymmetric explosive consolidation using water as a pressure medium to obtain nano-size grains. The compacts obtained were annealed between 873K and 1023K in salt bath. As results, (1) by the methods combined MA treatment with explosive consolidation, ultra fine grains with 90nm grain size were obtained by annealing at 873K for 20 min. The heat treatment using reversion from deformation induced martensite to austenite was suggested to obtain ultra fine grain structure in metastaible austenite steels. (2) compacts mixed with 4wt% Ni shows ultimat4e strength of 570MPa and elongation of 430% after heat-treatment at 1373K for 1h by tensile test.
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