圧延厚鋼板の弾塑性破壊じん性に及ぼす圧延比および試験片方位の影響について

概要

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In order to investigate the effects of rolling ratio and specimen orientation on the fracture toughness of thick rolled steel plate, elastic-plastic fracture toughness tests were carried out. A thick rolled steel plate initially 75mm in thickness was sliced along the rolling direction into three pieces and two of them were reduced by hot rolling to 38mm and 19mm. All the specimens with orientation TS or ST were collected in the thickness plane of each rolled plate. Fractographic observation such as stretched-zone width measurement was conducted as well as R curve determination. The results obtained are summarized as follows. (1) Both rolling ratio and directionality influenced the fracture toughness. The fracture toughness was higher for the TS specimens than for the ST specimens. This trend was intensified with increasing rolling ratio. (2) Critical stretched zone width also showed dependency on the two factors mentioned above. Elongated MnS inclusions induced difference of micro- and macroscopic fracture appearances.
社団法人日本機械学会の論文
1985-02-25