Re-examination of alloy designing for grain refinement strengthening in iron and steel

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In order to create a database for grain refinement strengthening of iron and steel, the following two researches were carried out. (1) the effects of carbon and nitrogen on grain refinement strengthening were investigated and the difference between carbon and nitrogen was discussed in terms of grain boundary segregation. (2) the effect of individual alloy elements on grain refinement strengthening, so-called Hall-Petch coefficient, was evaluated using interstitial free atoms free (IF) steel. As a result, (1) it was confirmed that carbon increases H-P coefficient more effectively than nitrogen due to a high amount of grain boundary segregation, but the tendency is able to be controlled by heat treatment. (2) the change in H-P coefficient depending on Cr, P and Ni could be evaluated individually.