遷移温度領域におけるへき開破壊じん性と破壊抵抗曲線の評価

概要

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Fracture toughness characterization in the transition region is examined for two low alloy steels focusing special attention on the fracture modes, cleavage mechanism and ductile tearing. Fracture toughness tests were conduced over the regions from transition to upper shelf using compact specimens. In the transition regime, a crack may initiate and grow some amount by ductile tearing followed by brittle fracture by cleavage. The fracture toughness, J_<in>, at the initiation of the ductile tearing tends to decrease with a reduction in test temperature, and the scatter in J_<in>, as well as the amount of stable crack growth, Δa, at the onset of the brittle fracture becomes more remarkable. Generally, Δa decreases as J_<in> decreases. It should be noted that these characteristics should be taken into consideration in developing a new explanation for the fracture toughness behavior in the transition region.
一般社団法人日本機械学会の論文
1986-01-25