Influence of Characteristic Inclusion Parameters on Ductility of 40CrNi2Mo Steel
夹杂物特征参数对40CrNi2Mo钢塑性的影响

The influence of characteristic inclusion parameters on ductility of 40CrNi2Mo steels produced by different metallurgy processes were analyzed by quantitative metallography, SEM and EDAX. Results show that decreasing the volume and size of inclusions and increasing the spacing of inclusions, the void nucleated by the inclusions coalescence by internal necking and the development of localized shearing between voids became more difficult in ductile fracture, so percentage reduction of area of VAR steels were better than ESR steel. Characteristic inclusion parameters had little effect on uniform elongation, strain hardening exponent and tensile strength.