(フェライト+オーステナイト)2相混合組織鋼の引張性質と破壊

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The tensile properties and fracture behaviors of 32 Cr-8 Ni steel with ferrite matrix and stable austenite phase were studied at room temperature. The specimens were prepared in two different conditions: The one consisting of ductile ferrite and austenite was obtained by quenching and the other having strengthened ferrite was obtained by ageing at 475℃ after quenching. The grain size of the specimens varied from 0.8 to 26.9 μ. The main results obtained are as follows: (1) For the aged specimens, 0.2 proof stress of the coarse grained specimens is below the value expected from the results of the fine grained specimens by extrapolation using the Petch's relation. This may be caused by the formation of deformation twins in the ferrite of the coarse grained specimens. (2) The fracture surfaces of all the quenched speimens show dimples, while those of the aged ones show both quasi-cleavage and dimples. Quasi-cleavage fracture occurs in the initial stage of fracture irrespective of grain size and is characterized by initiation and propagation of cleavage cracks in ferrite, followed by tear or dimple fracture in austenite. In the specimens with coarse grain, a crack propagates in the same manner as mentioned above until the final fracture. However in the specimens of fine grain the fracture by progress of quasi-cleavage cracks formed in the initial stage changes to dimple fracture in both ferrite and austenite. The size of this dimple region increases with a decrease in grain size and the reduction in area also increases with an increase in dimple region.
社団法人日本材料学会の論文
1978-08-15

(フェライト+オーステナイト)2相混合組織鋼の引張性質と破壊

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