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2022 Fiscal Year Final Research Report

Advanced Design of Fracture-Resistant High Strength Steels - Paradigm Shift in Controlling Grain Boundary Segregation

Research Project

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Project/Area Number 20H00296
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionTohoku University

Principal Investigator

Furuhara Tadashi  東北大学, 金属材料研究所, 教授 (50221560)

Co-Investigator(Kenkyū-buntansha) 榎木 勝徳  東北大学, 多元物質科学研究所, 助教 (60622595)
大谷 博司  公益財団法人豊田理化学研究所, フェロー事業部門, フェロー (70176923)
秋山 英二  東北大学, 金属材料研究所, 教授 (70231834)
Project Period (FY) 2020-04-01 – 2023-03-31
Keywords鉄鋼材料 / 粒界偏析 / 元素間相互作用 / ナノ解析 / 原子ポテンシャルモデリング / 粒界腐食
Outline of Final Research Achievements

Grain boundaries (GB) in polycrystalline materials causes fracture because interatomic bonds are broken and the strengthening always leads to fracture. Therefore, it is essential to control local enrichment of impurity elements ("grain boundary segregation"), which contributes to GB fracture, for designing higher strength materials. Therefore, the objective of this study was to establish advanced material design principles to overcome intergranular embrittlement, which hinders high strength of steel, by quantitative evaluation of elemental segregation, theoretical evaluation of GB segregation structure, and elucidation of its correlation with properties. As a result, we were able to elucidate the relationship between GB structure and segregation behavior and elemental interactions of C and P at the GB, and clarify the effect of impurity element segregation on GB corrosion.

Free Research Field

材料組織制御学

Academic Significance and Societal Importance of the Research Achievements

輸送機器や建築物などに使用される構造用金属材料を高強度化することで、小型化や軽量化、長寿命化により高効率・高安心社会構築に資することができる。多結晶材料である構造用金属材料を高強度化すると粒界からの破壊が生じるため、粒界破壊を抑制する材料設計指針を確立することが重要である。そこで本研究では、鉄鋼の粒界における元素の濃化に注目し、粒界構造と元素濃化量およびそれらが特性に及ぼす影響を明確にし、粒界強化鋼の設計指針を確立した。

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Published: 2024-01-30  

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