A quantitative study of void initiation was performed on low- and medium-carbon spheroidized steels deformed uniaxially in tension. Voids nucleate preferentially at the interfaces of large cementite particles located on ferrite grain boundaries. The voids elongate in the tensile direction without appreciable growth in the lateral directions. The void-profusion strain is about 0.8 for 0.17%C steels and 1.15 for 0.44%C steels. The rate of void nucleation with deformation was determined from the change of areal void density as a function of strain by considering the separate contributions of nucleation and growth.
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