Abstract
This is the first paper of a two paper contribution outlining the effect of inclusion morphology on elastic-plastic fracture toughness. In this paper, the effect of increasing hot deformation on the inclusion morphology of a semi-killed conventional (CON) X-70 pipeline steel was compared with that of a calcium treated (CAT) steel of the same chemical composition. Inclusion analyses at four stages of hot reduction of the CON steel viz S2 (38 pct reduced), S3 (70 pct reduced), S4 (88 pct reduced) and S6 (97 pct reduced) and two stages of reduction of the CAT steel viz C1 (63 pct reduced) and C2 (95 pct reduced) were accomplished using optical metallography, scanning electron microscopy (SEM), X-ray energy dispersive spectra (EDS), and electron-microprobe analyzing (EPMA) techniques. Quantitative analysis of the inclusion parameters, the area fraction (AF), the average inclusion length (Co), the inter-inclusion distance (D), the aspect ratio (FF), and the density of distributions (N) were carried out using a Quantimet 720 image analyzing computer and by direct microstructural measurements.
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