The Influence of Microstructural Morphology and Prestrain on Fatigue Crack Propagation of Dual-phase Steels in the Near-threshold Region
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概要
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The influence of microstructure and prestrain on fatigue crack propagation in the near threshold region was studied for dual-phase steels with different microstructural morphologies. The material with martensite phases dispersed in ferrite matrix exhibited a higher nominal stress intensity range and a lower crack propagation rate than those of material with a continuous martensite phase around ferrite grains. Prestrain prior to fatigue testing resulted in a decrease of nominal stress intensity range in both materials. However there was a slight difference among all the materials in the effective stress intensity range. The microstructural morphology and prestrain exerted a great influence on crack path and that caused a large difference in crack closure. A quantitative correlation existed between crack closure level and surface roughness of fatigue fracture.
- 社団法人 日本鉄鋼協会の論文
- 1999-05-15
著者
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Nakajima Katsumi
Materials & Processing Reserach Center Nkk Corp.
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Nakajima Katsumi
Department Of Biological Control System National Institute For Physiological Sciences
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Nakajima K
Materials & Processing Reserach Center Nkk Corp.
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KAMIISHI Susumu
Graduate Student, Nagoya University
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Miyata Takashi
Department Of Materials Science And Engineering Nagoya University
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Miyata Takashi
Department Of Chemistry And Materials Engineering Kansai University
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Kamiishi Susumu
Graduate Student Nagoya University
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KAMIISHI Susumu
Department of Materials Science and Engineering, Nagoya University
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YOKOE Masahiro
Department of Materials Science and Engineering, Nagoya University
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Yokoe Masahiro
Department Of Materials Science And Engineering Nagoya University
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Miyata Takashi
Department Of Biophysics Graduate School Of Sciecne Kyoto University
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Miyata Takashi
Department Of Biophysics Faculty Of Science Kyoto University
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MIYATA Takashi
Department of Applied Physics, Tokai University
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