17Cr フェライト系ステンレス鋼の熱間圧延時の再結晶挙動

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To investigate the recrystallization behaviour of a 17 Cr ferritic stainless steel during hot rolling, wedge shaped specimens taken from continious casting slab were hot rolled at temperatures from 1173K to 1453K in single pass manner, and then hardness test and optical microscopic observation were conducted. The results are as follows. At relatively lower heating temperatures near 1173K, deformation structure having many deformation bands forms especially in the vicinity of austenite phases that are isolatedly scattered in the initial ferrite grains. At higher rolling reduction, much deformation bands are introduced. At heating temperatures near 1273K, deformation structure changes into partial recrystallization structure with increasing rolling reduction. At relatively higher heating temperatures, recovery structure which contains many fine sub-boundaries is attained. Therefore the nose in recrystallization behavior exists at near 1273K. In the recrystallization region, recrystallization is accelerated with increasing rolling reduction, and consequently hardness of hot rolled specimens decreases at higher rolling reduction. However in the recovery region accompanied with sub-boundaries hardness increases with increasing rolling reduction. From the above results and discussion in mechanism of microstructural changes under restoration process, it is concluded that recrystallization structure is statically formed after hot rolling and recovery structure is dynamically formed in hot rolling process.
社団法人日本鉄鋼協会の論文
1983-09-01

17Cr フェライト系ステンレス鋼の熱間圧延時の再結晶挙動

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