1994 Fiscal Year Final Research Report Summary
Research on Microstructure Control and Improvement of Steel Seets Produced by Continuous Strip Casting Process
| Project/Area Number |
04555173
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MAKI Tadashi Kyoto University, Faculty of Eng., Professor, 工学部, 教授 (10026247)
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| Co-Investigator(Kenkyū-buntansha) |
UEMATU Yoshihiro Nisshin Steel Co., Ltd., Steel R&D Laboratories, Manager, 鉄鋼研究所・腐食防食研究室, 室長
FURUHARA Tasashi Kyoto University, Faculty of Eng., Research Associate, 工学部, 助手 (50221560)
TSUZAKI Kaneaki Kyoto University, Faculty of Eng., Associate Professor, 工学部, 助教授 (40179990)
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| Project Period (FY) |
1992 – 1994
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| Keywords | continuous strip casting / ferritic stainless steel / solidified structure / cold rolling / recrystallization / microstructer control |
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| Research Abstract |
The following experimental stuies have been carried out to examine the microstructre control of recrystallization structure of solidified columnar crystals in a 19%Cr ferritic stainless steel.
[1] Effects of Rolling Reductiion and Annealing Temperature on Recrystallization Structure
Reduction of cold-rolling was altered as 50%, 70%, and 90%, whereas subsequent annealing temperature was chainged from 700 to 1000ﾟC.Mirostructural observations and X-ray pole figure measurements were performed on specimens with different rolling and annealing conditions. The results showed that a favorable recrystallization structure with fine and uniformgrain size cannot be obtained simply by increasing rolling reduction or by increasing annealing temperature.
[2] Improvement of Recrystallization Structure by the Repetition of Rolling and Annealing
The orientations of recrystallized grains in a (001)[110]initially-oriented columnar crystal are random although such an oriented columanr crystal exhibits a very low recrystallization rate and a coarse recrystallization structure. Taking into account the above fact, the repetition of cold-rolling and annealing was applied to a columnar crystal specimen in order to improve its recrystallization structure. The result showed that a fine and uniform recrystallization structure can be achieved by two cycles of the repetition of 70% cold rolling and 973K annealing.
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