フェライト-パーライト鋼の引張変形応力に及ぼす温度,ひずみ速度とフェライト結晶粒径の影響(<特集>材料の内部構造と力学特性)

概要

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Tensile tests below room temperature were conducted to investigate effects of temperature, strain rate and ferrite grain size on tensile flow stress for ferrite-pearlite (FP) steels with ferrite grain sizes between 3.6 and 46.2 μm. The temperature and strain rate sensitivity of flow stress for the FP steels is almost independent of ferrite grain size. The flow stress for the FP steels is expressed by Hall-Petch equation; σ=σ_0+KD^-1/2, where D refers to ferrite grain size and σ_0 and κ constants. The slope κ of the equation is almost identical being independent of strain, temperature and strain rate. By summarizing the experimental results, it is possible to describe the flow stress of the FP steels by the following equation, σ=σ_t+182+5.8D^-1/2+900ε where σ_t and ε mean thermal component of stress and true strain, respectively; σ_t is influenced by ε, temperature and strain rate.
一般社団法人日本機械学会の論文
2002-11-25