Professor & Principal Investigator
Increasing the strength of austenitic stainless steels, high-Mn steels, and high-entropy alloys with hydrogen embrittlement resistance through N addition and grain refinement
Elucidation of the mechanism of hydrogen embrittlement of high strength steels with martensitic structure by some metallographic approaches. Microstructure control aimed at improving hydrogen embrittlement resistance properties based on the above knowledges.
New alloy design is performed by Thermo-Calc. and the alloys are manufactured by vacuum melting furnaces and various heat treatment furnaces. We can also increase the strength of conventional materials.
EBSD and digital image correlation (DIC) methods are applied to materials subjected to in-situ tensile testing in the SEM to visualize non-uniform plastic deformation behavior and stress concentration at the microstructural level.
Dislocation density and dislocation distribution parameters (M-values) are measured by X-ray line profile analysis of plate specimens, and their changes during mechanical testing.
