機械構造用鋼のストレッチ・ゾーン法によるじん性評価

概要

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The elastic-plastic fracture toughness J_<Ic> tests by the stretched zone method were performed to obtain J_<Ic> values for machine structural steels. The validity of the J_<Ic> values obtained was evaluated, and the effects of the heat treatment conditions and microstructure of steels on the J_<Ic> values were investigated by use of streched zone width, SZW. The results obtained are summarized as follows. (1) The inclination of the blunting line in SZW versus J curve is hardly affected by the condition of heat treatment for SCM440 steels, while it is affected obviously for S45C steels. (2) The relation between SZW_C and σ_B varies with the difference of microstructure and with the ratio of ferrite area to pearlite area in ferrite-pearlite steels. (3) SZW_C versus J_<Ic> / σ_<fs> diagram (in log. scale) can be arranged by two linear lines according to the difference of microstructure.
社団法人日本材料学会の論文
1983-04-15