2021 Fiscal Year Final Research Report
Crystal Structure Control of HCP Structural Materials Using WB Treatment and Evaluation of the Effect of Twinning on Fatigue Strength
| Project/Area Number |
19K05084
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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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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Osaka Sangyo University (2021)
Toyota Technological Institute (2019-2020) |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | マグネシウム合金 / 金属疲労 / ウェットブラスト処理 / バニシング加工 |
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| Outline of Final Research Achievements |
To evaluate the effect of twinning on fatigue strength properties of magnesium alloys, wet blasting and burnishing were performed. In the wet blasting process, it was clarified that the increase in surface roughness could be suppressed by multiple steps, and the effect of fatigue strength improvement was obtained. On the other hand, although the strain in the grain increased, it did not lead to the formation of twins. Therefore, burnishing was performed to promote the formation of twins, and although grain refinement was confirmed, the twinning ratio could not be changed. In the future, we plan to change the processing conditions of the burnishing process and prepare specimens with different twinning ratios for evaluation.
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| Free Research Field |
材料加工・組織制御工学
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| Academic Significance and Societal Importance of the Research Achievements |
マグネシウム合金は切欠き感受性が高くピーニング処理による疲労強度向上効果が低いといわれていた．そこで表面粗さの異なる試験片を作成しアルミニウム合金との比較を行った．その結果，切欠き感受性はアルミニウム合金と同様であり，切欠き感受性のみがピーニングによる疲労強度向上効果が低い要因ではないことを明らかにした．また，マグネシウム合金においても適切処理条件でピーニング処理を行うことで，疲労強度向上効果が得られることを示した．
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