Effects of the Cr and Ni concentrations on the fatigue and corrosion resistances of Fe−Mn−Cr−Ni−Si alloys for seismic damping applications

Fumiyoshi Yoshinaka; Yusuke Tsutsumi; Tomoya Nagira; Susumu Takamori; Satoshi Emura; Takahiro Sawaguchi; Hideki Katayama; Terumi Nakamura; Yasuhiko Inoue; Susumu Motomura; Atsumichi Kushibe

doi:10.2355/isijinternational.ISIJINT-2023-437

論文 Effects of the Cr and Ni concentrations on the fatigue and corrosion resistances of Fe−Mn−Cr−Ni−Si alloys for seismic damping applications

Fumiyoshi Yoshinaka (Research Center for Structural Materials/Materials Manufacturing Field/Fatigue Resistant Alloy Design Group, National Institute for Materials Science) ; Yusuke Tsutsumi (Research Center for Structural Materials/Materials Evaluation Field/Corrosion Research Group, National Institute for Materials Science) ; Tomoya Nagira (Research Center for Structural Materials/Materials Evaluation Field/Welding and Joining Technology Group, National Institute for Materials Science) ; Susumu Takamori (Research Center for Structural Materials/Materials Manufacturing Field/Fatigue Resistant Alloy Design Group, National Institute for Materials Science) ; Satoshi Emura (Research Center for Structural Materials/Materials Manufacturing Field/Thermomechanical Processing Group, National Institute for Materials Science) ; Takahiro Sawaguchi (Research Center for Structural Materials/Materials Manufacturing Field/Fatigue Resistant Alloy Design Group, National Institute for Materials Science) ; Hideki Katayama (Research Center for Structural Materials, National Institute for Materials Science) ; Terumi Nakamura (Research Network and Facility Services Division/Materials Manufacturing and Engineering Station/Forging Simulator Group, National Institute for Materials Science) ; Yasuhiko Inoue (Takenaka Corporation) ; Susumu Motomura (Takenaka Corporation) ; Atsumichi Kushibe (Takenaka Corporation)

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Fumiyoshi Yoshinaka, Yusuke Tsutsumi, Tomoya Nagira, Susumu Takamori, Satoshi Emura, Takahiro Sawaguchi, Hideki Katayama, Terumi Nakamura, Yasuhiko Inoue, Susumu Motomura, Atsumichi Kushibe. Effects of the Cr and Ni concentrations on the fatigue and corrosion resistances of Fe−Mn−Cr−Ni−Si alloys for seismic damping applications. ISIJ INTERNATIONAL. 2024, (), . https://doi.org/10.2355/isijinternational.ISIJINT-2023-437

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Previous research has shown that Fe–Mn–Cr–Ni–Si alloys offer excellent low-cycle fatigue resistance via reversible bidirectional transformation between face-centered cubic (FCC) γ-austenite and hexagonal closed-packed (HCP) ε-martensite. The alloy shows superior low-cycle fatigue life and is used for seismic damping applications, but there have been concerns over their resistance to highly corrosive environments. In this study, Fe–15Mn–aCr–bNi–4Si alloys were prepared with different Cr and Ni concentrations to evaluate the effects on the fatigue and corrosion resistances: Z1 with (a, b) = (14, 10.1), Z2 with (a, b) = (12.5, 8.8), Z3 with (a, b) = (11, 7.5), Z4 with (a, b) = (9.5, 6.1), and Z5 with (a, b) = (8, 4.8). Z2 had the longest fatigue life. The alloy showed Gibbs free energy difference between γ-austenite and ε-martensite phases close to the ideal of zero and the α′-martensitic transformation was suppressed well, which agreed with the design criteria for achieving bidirectional transformation-induced plasticity. The developed alloys showed superior corrosion resistance in seawater. Local pitting corrosion was observed that was attributed to the high Mn concentration of the alloys, although this was greatly mitigated by adjusting the Cr and Ni concentrations, especially with Z1 and Z2.

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