Fe・Ni・C鋼の加工誘起M変態強化の定量

概要

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Strengthening of a Fe-27.59% Ni-0. 28%C (Wt%) steel in tension results from both the ordinary strain hardening in austenite and martensite which compose a dual-phase steel and the hardening due to martensite induced during straining of the steel. The volume fractions of martensite induced in the steel at 0℃, -19℃, -34℃ and -49℃ are measured by the X-ray diffraction method (Motarget, multi-peak method). The stress-strain relations of the steel at these temperatures are analyzed and expressed by the equations of a variable volume model (abbr. as VVM) previously proposed by us. The analytical relations of each strain, each stress, transformation strain, balanced bonding mechanism of two phases, contributions of strain and stress of each phase and so on are discussed in detail. These analytical curves show excellent agreement with the experimental data obtained from a study of the X-ray residual stress measurements on this steel, and the equations of the VVM model are shown to be successfully applied to the Fe-Ni-C steel which induces the lenticular martensite with different tensile properties from those of the lath martensite in SUS 304 stainless steel reported previously.
一般社団法人日本機械学会の論文
1990-01-25