Abstract
Ductile fracture was investigated in a spheroidized steel, similar to AISI 1520, which contained negligible amounts of P and S. The detailed substeps of the ductile fracture process were characterized by careful sectioning studies. It was found that 1. (i) void initiation appeared to be controlled by a criterion involving stress, 2. (ii) void growth was predominantly affected by plastic strain, 3. (iii) additional strain was needed to arrive at final fracture even after the void coalescence stages, comprising microvoid coalescence and macrovoid coalescence, had occurred and 4. (iv) the central crack growth in tension mainly depended on the strain concentration at the crack tip. The effect of localized deformation on fracture could not play a role in axisymmetric tension, due to a high critical strain for shear band formation.
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