In-situ observation during fracture and fatigue testing of micro single crystal

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14423
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Kumamoto University
• Principal Investigator: Mine Yoji 熊本大学, 大学院先端科学研究部(工), 准教授 (90372755)
• Co-Investigator(Kenkyū-buntansha): 高島 和希 熊本大学, 大学院先端科学研究部(工), 教授 (60163193)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 構造・機能材料

Outline of Final Research Achievements

A conventional mechanical test is difficult to analyze the relationship between the microstructural and mechanical properties in an alloy with a complicated hierarchical microstructure. We developed micro fatigue crack growth testing technique using a specimen downsized to 1/50 from the standard compact-tension (CT) specimen. The fatigue crack growth behavior of single-packet structures was examined using small CT specimens with different habit plane orientations to elucidate the microstructural cracking in lath martensite steels. This study also focused on the martensitic transformation during fatigue crack growth in twinned crystals to elucidate the hydrogen-induced twin boundary separation in type 304 stainless steel.

Free Research Field

材料強度学