Delamination Toughening of Ultrafine Grain Structure Steels Processed through Tempforming at Elevated Temperatures
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概要
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The deformation of tempered martensitic structures, namely tempforming treatments, were applied to a 0.6C–2Si–1Cr steel at 500, 600 and 700°C using multi-pass caliber-rolling with an accumulated area reduction of 80%. The tensile and Charpy impact properties were investigated to make clear the relation between the microstructure and the delamination behavior of the tempformed (TF) samples. The tempforming treatments resulted in the evolution of ultrafine grain structures with strong ‹110›//rolling direction (RD) fiber deformation textures and fine spheroidized cementite particles distributions. In contrast to the ductile-to-brittle transition of the conventional quenched and tempered (QT) samples, the TF samples exhibited inverse temperature dependences of the impact toughness due to the delaminations, where the cracks branched in the longitudinal direction (//RD) of the impact test bars. As a result, high strength with excellent toughness was achieved in the TF samples. A yield strength of 1364 MPa and a V-notch Charpy absorbed energy of 125 J were obtained at room temperature in the sample that was tempformed at 500°C. The delamination was shown to occur due to the microstructural anisotropy of the TF samples, and the dominating factors controlling the delamination toughening were the transverse grain size, the grain shape and the ‹110›//RD fiber deformation texture. The discussion also indicated that the ultra refinement of the transverse grain structure was the key to enhancing both the yield strength and the toughness of the TF steel while lowering the ductile-to-brittle transition temperature.
- 2010-01-15
著者
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YIN Fuxing
Exploratory Materials Research Laboratory for Reliability and Safety, National Institute for Materia
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Yin Fuxing
Exploratory Materials Research Laboratory For Reliability And Safety National Institute For Material
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Inoue T
National Inst. Metals Sci.
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Inoue Tadanobu
Nims
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Inoue Tadanobu
Steel Research Center National Institute For Materials Science
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Inoue Tadanobu
Metallurgical Processing Group Steel Research Center National Institute For Materials Science
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Inoue Tadanobu
Innovative Materials Engineering Laboratory National Institute For Materials Science
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Inoue Tadanobu
Innovative Materials Engineering Lab. National Institute For Materials Science
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Inoue Tadanobu
National Institute For Metals Science
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Yin Fuxing
Exploratory Materials Res. Lab. For Reliability And Safety National Inst. For Materials Sci.
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Kimura Y
Kyushu Univ. Fukuoka‐ken Jpn
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Kimura Yuuji
Structural Metals Center National Institute Of Materials Science
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Kimura Yuuji
Department Of Materials Science And Engineering Kyushu University
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Kimura Yuuji
Materials Engineering Group Department Of Materials Physics And Chemistry Graduate School Of Enginee
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TSUZAKI Kaneaki
Structural Metals Center, National Institute for Materials Science
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INOUE Tadanobu
Exploratory Materials Research Laboratory for Reliability and Safety, National Institute for Materia
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Inoue Tadanobu
Exploratory Materials Research Laboratory For Reliability And Safety National Institute For Material
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Inoue T
National Institute For Materials Sciense
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Tsuzaki Kaneaki
Structural Metals Center National Inst. For Materials Sci.
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Tsuzaki Kaneaki
Steel Research Center National Inst. For Materials Science (nims)
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Tsuzaki Kaneaki
Structural Metals Center National Institute Of Materials Science
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Tsuzaki Kaneaki
Structural Metals Center National Institute For Materials Science
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Tsuzaki Kaneaki
Doctoral Program In Materials Science And Engineering University Of Tsukuba
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Kimura Yuuji
Structural Metals Center National Institute For Materials Science
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Tsuzaki Kaneaki
Steel Research Center National Institute For Materials Science
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Tsuzaki Kaneaki
National Institute For Materials Science Tsukuba
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Tsuzaki Kaneaki
Frontier Research Center For Structural Materials National Institute For Materials Science
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Tsuzaki Kaneaki
Frontier Research Center For Structural Materials National Research Institute For Metals
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Tsuzaki Kaneaki
Structural Materials Unit, Research Center for Strategic Materials, National Institute for Materials Science (NIMS)
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