厚肉高張力鋼の降伏挙動に及ぼす組織の影響

概要

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The heavy-gauge HSLA steel plates with low yield ratio have been applied to the steel-frames of highrise buildings to utilize the benefits of their high strength and uniform deformability. The yielding behavior of steels relates to the microstructural morphologies such as microstructure, volume fraction and shape of each phase, dislocation, grain size and so on. In the present paper, appropriate microstructural morphology for low YR HSLA steel was investigated by FEM analysis. The influence of shape, volume fraction and mechanical properties of each phase on yielding behavior were analyzed by dual-phase and tri-phase models. From a series of FEM analysis, it is clarified that the appropriate microstructural morphologies to decrease the YR are as follows. (1) Uniform distribution of spherical high-hardness phase in low-hardness phase (2) Around 50% volume fraction of low-hardness phase (3) Increase of the ratio of yield strength of high-hardness phase to that of low-hardness phase.
社団法人日本鉄鋼協会の論文
1990-01-01