オーステナイト鋼の引張変形挙動におよぼす温度と歪速度の影響

概要

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Tensile deformation behaviour of Fe-Cr-Ni and Fe-Mn-Cr austenitic steels with various combinations of carbon and nitrogen contents was determined by means of tesile testing in the range of temperatures from room temperature to 700℃ with various strain rates. Tensile strength and yield strength of low carbon austenitic steel decrease gradually as the temperature increases and austenitic steel with carbon content of more than 0.3wt% shows a rapid increase of work hardening rate in the temperature range from room temperature to 200℃ and in this temperature range, serration is observed in stress-strain curves. It is assumed that this serration is associated with the interaction of interstitial atoms (such as carbon) and dislocations. When temperature reaches 450℃, another type of serration appears, but this serration gives a smaller work hardening rate compared with the one observed at temperatures from room temperature to 200℃. This observation proves that serration is closely related with tensile deformation behaviour.
社団法人日本鉄鋼協会の論文
1977-12-01