2013 Fiscal Year Final Research Report
Control of the high speed plastic properties by the phase boundaries in FCC+BCC multi phased steels
| Project/Area Number |
23560839
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Osaka University (2012-2013)
Kagawa University (2011) |
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Principal Investigator |
UEJI Rintaro 大阪大学, 接合科学研究所, 准教授 (80380145)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUGUCHI Takashi 香川大学, 工学部, 助教 (00462515)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 材料強度 / 高速変形 / 異相境界 / 結晶塑性 / オーステナイト / 鉄鋼材料 / フェライト / 加工熱処理 |
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| Research Abstract |
This study is aimed to clarify the plastic properties of the ferrite and austenite duplex phase steels at high speed deformation. The stress - strain curves were measured with the sensing block type testing machine at various strain rate ranging from 0.001/s to 1000/s. It was clarified that the duplex phase steel has a significant increase of 0.2% offset stress with the strain rate increasing. The EBSD (Electron back scattering diffraction) measurement was conducted on the samples deformed up to various strain at various strain rate. The misorientation measurement at the vicinity of the phase boundaries were examined and the preferential development of the local misorientation was clarified. This means that the dislocation structure which provides the long range stress field can be easily evolved near the phase boundaries. In addition, the relationship between the dynamic phase transformation and the dislocation structure was also found.
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