2009 Fiscal Year Final Research Report
Mechanical property and its application of steel sheets with strength gradient through sheet thickness direction
| Project/Area Number |
20686047
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kyushu University |
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Principal Investigator |
TSUCHIYAMA Toshihiro Kyushu University, 大学院・工学研究院, 准教授 (40315106)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 強度勾配 / 加工用薄鋼板 / 強度傾斜鋼板 / ステンレス鋼 / 固相窒素吸収法 / 固溶強化 / 引張特性 / 曲げ加工 |
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| Research Abstract |
As a new approach to control mechanical properties of steel sheets for press forming, the effectiveness of changing material strength continuously through sheet thickness direction was investigated. In this study, nitrogen concentration distribution was controlled for stainless steel to obtain 'strength-gradient steel sheets' with a maximum strength at the surface or in the center of the sheet, and then the mechanical properties of these specimens were evaluated. As a result, the bending strength was found to be varied depending on the strength-gradient even when the tensile strength is identical. This suggests that it would be possible to improve mechanical properties of steel sheets for press forming by this method.
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