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DP鋼の打抜き大変形の定量的評価とそのミクロ組織変化(第2報) : 電子線後方散乱法とデジタル画像相間法を組み合わせたDP鋼の局所ひずみマッピング

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Title: DP鋼の打抜き大変形の定量的評価とそのミクロ組織変化(第2報) : 電子線後方散乱法とデジタル画像相間法を組み合わせたDP鋼の局所ひずみマッピング
Other Titles: Quantification of Large Deformation with Punching in Dual Phase Steel and Change of its’ Microstructure : Part II: Local Strain Mapping of Dual Phase Steel by a Combination Technique of Electron Backscatter Diffraction and Digital Image Correlation Methods
Authors: 中田, 伸生1 Browse this author
池田, 賢一2 Browse this author →KAKEN DB
首藤, 洋志3 Browse this author
横井, 龍雄4 Browse this author
土山, 聡宏5 Browse this author
波多, 聰6 Browse this author
中島, 英治7 Browse this author
高木, 節雄8 Browse this author
Authors(alt): Nakada, Nobuo1
Ikeda, Ken-ichi2
Shuto, Hiroshi3
Yokoi, Tatsuo4
Tsuchiyama, Toshihiro5
Hata, Satoshi6
Nakashima, Hideharu7
Takaki, Setsuo8
Keywords: local strain mapping
heterogeneous strain distribution
electron backscatter diffraction
dual phase steel
digital image correlation
Issue Date: May-2016
Publisher: 日本鉄鋼協会
Journal Title: 鉄と鋼
Volume: 102
Issue: 5
Start Page: 253
End Page: 259
Publisher DOI: 10.2355/tetsutohagane.TETSU-2015-086
Abstract: To evaluate heterogeneous strain distribution developed by pre-deformations in dual phase (DP) steel accurately, a combinational technique of Electron Backscatter Diffraction (EBSD) and Digital Image Correlation (DIC) methods was newly introduced in this study. A good correlation is established between kernel average misorientation calculated by EBSD and local equivalent strain measured by DIC in ferrite matrix of DP steels regardless of the difference in deformation process, which means that an EBSD orientation map can be easily converted into an applicative strain map by employing the individual correlation formula. This new technique reveals that very high strain region is locally formed within dozens of micrometer from the punched edge in a punched DP steel. On the other hand, hard martensite grains dispersed in DP steel remarkably promote the heterogeneity of strain distribution in ferrite matrix. As a result, the high strain region is also developed in the form of bands in a cold-rolled DP steel by only 60% thickness reduction at least, as if it is affected by the distribution and morphology of martensite grains. In addition, the local strain mapping demonstrates that the equivalent strain of the high strain band in cold-rolled material is comparable to that of the heavily deformed edge in punched one. The very high strain band in ferrite matrix is characterized by ultrafine grained structure, which leads to the possibility for the losing ductility in ferrite matrix and the martensite cracking.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 池田 賢一

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