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  1. Chapter

    Designing High-Mn Steels

    High-Mn austenitic steels undergo characteristic plasticity mechanisms of the γ-austenite with an FCC structure, such as extended dislocation glide, mechanical twinning, and mechanical martensitic transformati...

    Takahiro Sawaguchi in The Plaston Concept (2022)

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  2. Article

    Open Access

    A strategy of designing high-entropy alloys with high-temperature shape memory effect

    Shape memory effect, the ability to recover a pre-deformed shape on heating, results from a reversible martensitic transformation between austenite and martensite phases. Here, we demonstrate a strategy of des...

    Je In Lee, Koichi Tsuchiya, Wataru Tasaki, Hyun Seok Oh… in Scientific Reports (2019)

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    Article

    Microstructural damage evolution and arrest in binary Fe–high-Mn alloys with different deformation temperatures

    We investigated the damage evolution behaviors of binary Fe–28–40Mn alloys (mass%) from 93 to 393 K by tensile testing. The underlying mechanisms of the microstructure-dependent damage evolution behavior were ...

    Motomichi Koyama, Takahiro Kaneko, Takahiro Sawaguchi… in International Journal of Fracture (2018)

  4. No Access

    Chapter and Conference Paper

    Effect of Microstructure on the Low-Cycle Fatigue Properties of a Fe–15Mn–10Cr–8Ni–4Si Austenitic Alloy

    In the present study, the effect of the initial austenitic structure on the low-cycle fatigue (LCF) properties and ε-martensitic transformation (ε-MT) was studied in the Fe–15Mn–10Cr–8Ni–4Si seismic dam** al...

    Ilya Nikulin, Takahiro Sawaguchi… in Proceedings of the International Conferenc… (2018)

  5. No Access

    Article

    Hydrogen Embrittlement Susceptibility of Fe-Mn Binary Alloys with High Mn Content: Effects of Stable and Metastable ε-Martensite, and Mn Concentration

    To obtain a basic understanding of hydrogen embrittlement associated with ε-martensite, we investigated the tensile behavior of binary Fe-Mn alloys with high Mn content under cathodic hydrogen charging. We use...

    Motomichi Koyama, Shota Okazaki… in Metallurgical and Materials Transactions A (2016)

  6. No Access

    Chapter and Conference Paper

    Low-cycle fatigue properties of the Fe-30Mn-(6-x)Si-xAl TRIP/TWIP alloys

    Low-cycle fatigue (LCF) properties of the Fe-30Mn-(6-x)Si-xAl alloys ascribed to TRIP/TWIP high-Mn austenitic alloys were examined in relation with tensile properties. It was found that fatigue resistance of t...

    Ilya Nikulin, Takahiro Sawaguchi… in Proceedings of the 8th Pacific Rim Interna… (2016)

  7. No Access

    Article

    Microstructure Evolution Associated with a Superior Low-Cycle Fatigue Resistance of the Fe-30Mn-4Si-2Al Alloy

    The microstructure evolution responsible for the superior low-cycle fatigue (LCF) resistance (N f > 8000 cycles at a total strain range of 2 pct) was studied in the Fe-30Mn-4Si-2Al alloy s...

    Ilya Nikulin, Takahiro Sawaguchi… in Metallurgical and Materials Transactions A (2015)

  8. No Access

    Article

    Premature Fracture Mechanism in an Fe-Mn-C Austenitic Steel

    We investigated the cause for poor ductility in austenitic Fe-Mn-C steels under a specific condition. Tensile tests were performed on an Fe-17Mn-0.3C steel at 273 K, 294 K, 323 K, 373 K, 423 K, 473 K, and 523 ...

    Motomichi Koyama, Takahiro Sawaguchi… in Metallurgical and Materials Transactions A (2012)

  9. No Access

    Article

    Grain-size effect on shape-memory behavior of Ti35.0Ni49.7Zr15.4 thin films

    The grain-size effect on shape-memory behavior of fine-grained Ti35.0Ni49.7Zr15.4 thin films was investigated by transmission electron microscopy. The films, with various grain sizes ranging from about 150 to abo...

    Takahiro Sawaguchi, Morio Sato, Akira Ishida in Metallurgical and Materials Transactions A (2004)