2015 Fiscal Year Final Research Report
Mechanism Improving Fatigue Strength of Next Generation Ultrahigh-Strength TRIP-Aided Steels
| Project/Area Number |
25289262
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 低合金TRIP鋼 / 熱処理 / 残留オーステナイト / 疲労強度 / 切欠き感受性 / 表面改質 / 真空浸炭 / 微粒子ピーニング |
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| Outline of Final Research Achievements |
For applications to powertrain components of automobiles and construction machines, fatigue and delayed fracture strengths of the next generation C-Si-Mn-Cr-Mo TRIP-aided martensitic (TM) steels were investigated. The main results are as followed. (1) Optimum thermo-mechanical treatment, chemical composition, fine particle peening condition and vacuum carburizing condition for the notch-fatigue of the TM steels were decided. (2) The mechanism improving the fatigue strength was proposed on the basis of fracture mechanics theory. (3) Delayed fracture strength of the TM steels was enhanced, as well as optimum chemical composition and heat-treatment condition.
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| Free Research Field |
材料加工・組織制御工学
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