Development of highly oriented martensite microstructure for enhanced high strength and high ductility combination

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04151
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Inoue Junya 東京大学, 先端科学技術研究センター, 准教授 (70312973)
• Co-Investigator(Kenkyū-buntansha): 小島 真由美 東京大学, 大学院工学系研究科(工学部), 助教 (80569799)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: ラスマルテンサイト / バリアント選択 / 局所変形挙動 / フェーズフィールド

Outline of Final Research Achievements

For the development of next generation advanced high strength steels, a new technology to suppress strain localization phenomena usually observed in martensite at an early stage of deformation is indispensable. In the present study, highly oriented martensite microstructure is proposed as one of the solutions, and clarified that new method using Ms gradient is one of the effective measures to realize such microstructures. In addition, the mechanism of early strain localization was also clarified from the combination of in-situ and cross-sectional observations of slip bands.

Free Research Field

金属材料強度学