オーステンパ球状黒鉛鋳鉄の塑性変形挙動に及ぼすひずみ速度の影響

概要

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The effect of strain rate on the plastic deformation behavior of austempered spheroidal graphite cast iron was studied. The matrix of specimens consisted of mixed banitic ferrite together with retained austenite. Thin-walled tubular specimens were strained under tensile stresses or torsional stresses. It was found that the deformation of austempered spheroidal graphite cast iron under both tensile and torsional stresses did not depend much on strain rate in an elastic region. The results for maximum strain under tensile stresses were scattered because the specimens were thin-walled tubes which had numerous graphite nodules and a few defects. The results of tensile tests of thin-walled tubular specimens were greatly influenced by the shape of specimens and defects, whereas the results of torsional tests were hardly influenced. The ratio of transformed retained-austenite into martensite under torsional stresses did not vary with strain rate. It was presumed from this result that work hardening affected an increase of yield stress and torsional strength.
一般社団法人日本機械学会の論文
1995-02-25