遷移温度域におけるJ_<Ic>試験

概要

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Fracture toughness tests and unloading tests of C-1/2 Mo steel and 2 1/4 Cr-1Mo steel were conducted on CT specimens with different thickness at the ductile-brittle transition temperatures. According to fractographic examination of microscopic ductile tearing at the crack tip on the fracture surface of the specimens by a scanning electron microscope, the following two test procedures were proposed to estimate the plane strain fracture toughness K_<Ic> Of small size specimens at the transition temperature; (1) The modified J_<Ic> test procedure to determine the value of J or K_I at the initiation of microscopic ductile tearing at the midsection of the specimen which has critical volume as a trigger of cleavage fracture, and (2) the interpolation technique using the values of K_<Ic> which are determined by J_<Ic> test at the upper shelf temperature and K_<Ic> test at the lower shelf temperature.
社団法人日本材料学会の論文
1984-05-15