2011 Fiscal Year Final Research Report
Toughening of ultra high strength steel using delamination
| Project/Area Number |
21560763
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
KIMURA Yuuji 独立行政法人物質・材料研究機構, 構造材料ユニット, 主幹研究員 (80253483)
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| Co-Investigator(Renkei-kenkyūsha) |
INOUE Tadanobu 独立行政法人物質・材料研究機構, 主幹研究員 (90354274)
YIN Fuxing 独立行政法人物質・材料研究機構, 主席研究員 (80354273)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 結晶・組織制御 / 構造・機能材料 / 材料加工・熱処理 |
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| Research Abstract |
The present study was undertaken to make clear the specific microstructural factors which control the delamination toughening in ultrafine grain(UFG) structure steel processed by deformation of tempered martensitic structure at elevated temperature(i. e., warm tempforming). The warm tempforming was applied to low-alloy steels at different rolling temperatures and rolling reductions to obtain the UFG structures with different microstructural factors such as the transverse grain size, the grain shape, the texture, etc. The tensile and Charpy impact properties of the UFG samples were investigated in association with these microstructural factors. It was concluded that the dominating factors controlling the delamination toughening were the transverse grain size, the grain shape and the<110>//RD fiber deformation texture.
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