高張力HT80の内部摩擦およびヤング率に及ぼす微細組織の影響

概要

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The effects of microstructure on internal friction (strain amplitude for measurement≒1×10^<-4>) and Young's modulus have been investigated for the heat-treated specimens of commercial 80 kgf/mm^2 grade high-tensile strength steel (HT 80). It was found to that the internal friction was strongly affected by the distribution of carbide particles in the interior of the grain. The internal friction abruptly decreased with a decrease of particle spacing below about 1×10^<-6>m. This can be correlated with a decrease of magneto-mechanical histersis loss. Young's modulus increased with an increase in the amount of cabides in the steel which resulted in a decrease in dissolved carbon content in the matrix. It was revealed that the as-received steel (sorbite structure) had the largest Young's modulus and the smallest internal friction, while the annealed specimen (coarse sorbite) showed an excellent combination of large internal friction and large Young's modulus. The surface finishing also influenced the internal friction of specimens.
社団法人日本材料学会の論文
1985-11-15