Measurement of Hierarchal 3D-Strain in Polycrystalline Materials

2014 Fiscal Year Final Research Report

• Project/Area Number: 24760569
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: The University of Tokyo
• Principal Investigator: OJIMA Mayumi 東京大学, 工学(系)研究科(研究院), 助教 (80569799)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 応力/ひずみ測定 / 力学的特性 / 組織 / EBSD / 中性子回折 / その場測定

Outline of Final Research Achievements

Distribution of deformation strongly affects mechanical property in polycrystalline materials, therefore precise measurement of stress/strain not only in the macroscopic scale but also in each grains have been requested for many years. In this study, hierarchal stress/strain measurement using EBSD technique, in-situ technique, 3D-reconstruction technique and neutron(synchrotron) diffraction technique was applied for advanced high strength steels to investigate the deformation behavior. Multilayered steels consisting high strength martensite and high ductile austenite were mainly investigated. Distribution of stress/strain in various scale was successfully obtained during tensile deformation, which led to understand of characteristic deformation behavior and to find a possible reason for improvement of mechanical property in multilayered steels.

Free Research Field

材料工学