Deformation Microstructure and Nucleation of Recrystallization in Hot-deformed Single Crystals of 18% Cr Ferritic Steel
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概要
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Static recrystallization of the hot deformed single crystals with [001], [111], [133] and [135] initial orientation of an 18% Cr ferritic stainless steel was studied. It was clarified that the hot-deformed microstructures and the recrystallization behaviors strongly depend on the initial orientation. The [001] crystal showed coarse and diffuse subgrains after hot-compression, the [111] and the [135] crystals formed relatively fine and uniform subgrains, and a number of the deformation bands elongated perpendicular to the compression axis developed in the [133] crystal. The [001] crystal was extremely hard to recrystallize and showed no recrystallization after a long time annealing. The [111] and the [135] crystals were relatively hard to recrystallize. The enhanced recrystallization along the deformation bands occurred in the [133] crystal, and the recrystallized grains had the orientations between those of the matrix and the deformation bands. The dislocation density, <I>i.e.</I>, the driving force for static recrystallization, in the hot-deformed subgrain structures were quantitatively evaluated on the basis of the detailed TEM observations. Although the dislocation density in the [001] crystal which showed no recrystallization was lower than those of the other orientations, that of the [133] crystal which showed enhanced nucleation was similar to that of the [111] crystal which was relatively hard to recrystallize. That is, the dislocation density in the deformed matrix does not necessarily correspond with the easiness of nucleation. EBSP measurements clearly showed that the narrow regions (transition bands) between the deformation bands and the matrix in the [133] crystal bear large misorientations about 50 degrees. It is concluded from those results that the large local misorientation in the deformation microstructure does be important for the nucleation of recrystallization and it is generally treacherous to discuss the nucleation problem only on the basis of the macroscopic and averaged information, such as the mean dislocation density, of the deformed state.
- 社団法人 日本鉄鋼協会の論文
- 1998-04-15
著者
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SAITO Yoshihiro
Department of Radiology and Radiation Oncology, Gunma University School of Medicine
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TSUJI Nobuhiro
Department of Adaptive Machine Systems, Osaka University
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Saito Yoshihiro
Department Of Bio-analytical Chemistry Osaka University Of Pharmaceutical Sciences
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Tsuji Nobuhiro
Department Of Adaptive Machine Systems Graduate School Of Engineering Osaka University
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Tsuji Nobuhiro
Department Of Materials Science And Engineering Osaka University
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MURAKI Mineo
Electrical Steel Laboratory, Technical Research Laboratories, Kawasaki Steel Corporation
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Muraki M
Electrical Steel Research Department Technical Research Laboratories Kawasaki Steel Corporation
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Muraki Mineo
Electrical Steel Laboratory Technical Research Laboratories Kawasaki Steel Corporation
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SHINMIYA Toyohisa
Graduate Student, Osaka University
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Shinmiya Toyohisa
Graduate Student Osaka University
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Saito Yoshihiro
Department Of Materials Science And Engineering Osaka University
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Saito Yoshihiro
Department Of Analytical Chemistry Osaka University Of Pharmaceutical Sciences
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Saito Yoshihiro
Department Of Aeronautics And Astronautics
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