![]() ![]() ![]() Based on the results, we then proposed a 3D model on micro-crack with an oblate spheroid assumption of pearlite grain to quantitatively relate microstructures of ferrite-pearlite steel to the fracture stress. It is also found under the ellipse approximation of the micro-cracks that the distribution of major axis of micro-crack was close to that of the ferrite grain diameter and the distribution of miner axis was an intermediate between those of ferrite grain diameter and pearlite band thickness. As a result of superposition of both the 3D images, it is found that a micro-crack initiated at ferrite-pearlite boundary and then propagated into pearlite grain. Two types of micrographs before and after nital etching were taken to obtain 3D images of micro-cracks and microstructures, respectively. A 3D observation was first performed to characterize the relationship between micro-cracks and microstructures using a serial sectioning technique. In order to establish a basis to predict fracture toughness of ferrite-pearlite steel, a two-stage investigation was performed. ![]()
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