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Effect of Solute Carbon on the Characteristic Hardening of Steel at High Temperature

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Small ball rebound hardness tests demonstrated characteristic hardening at 700 K in the ultra-low carbon and pearlitic steels. The equilibrium phase diagram of Fe-C binary alloy calculated using Thermo-Calc exhibited dissolving of cementite above 700 K. Moreover, in-situ heating neutron diffraction measurement demonstrated the increase of lattice parameter by dissolving of cementite above 700 K. Therefore, it can be concluded that the characteristic hardening above 700 K can be attributed to the solid solute carbon.

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The neutron diffraction experiments were performed using BL19 in the Materials and Life Science Experimental Facility (MLF) of J-PARC following the proposal of 2018B0213. Part of this work was financially supported by Iketani Science and Technology Foundation (0311099-A).

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Correspondence to Norimitsu Koga.

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Manuscript submitted August 25, 2020; accepted November 24, 2020.

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Koga, N., Umezawa, O., Yamamoto, M. et al. Effect of Solute Carbon on the Characteristic Hardening of Steel at High Temperature. Metall Mater Trans A 52, 897–901 (2021). https://doi.org/10.1007/s11661-020-06113-4

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  • DOI: https://doi.org/10.1007/s11661-020-06113-4

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