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A study was conducted to demonstrate physical interpretation of grain refinement-induced variation in fracture mode in ferritic steel. Tensile tests were performed at room temperature and at a crosshead rate of 0.4 mm/min with specimens of 4 mm in diameter and 10 mm in gage length to investigate the dependence of critical fracture strain on ferrite grain size. Round smooth tensile specimens were applied to conduct the investigations where they were in uniaxial stress state before the onset of necking and turned into triaxial state after necking. The stress triaxiality in the region ahead of the crack was higher than that in the round smooth tensile specimen for a sample with a crack as the crack tip was sharp. The fracture strain obtained from tensile tests was larger than the critical fracture strain in the local region ahead of the crack.

Physical Interpretation of Grain Refinement-induced Variation in Fracture Mode in Ferritic Steel