Effects of carbon and chromium on block size of acicular ferrite in low carbon steel weld metals

The effects of carbon and chromium on the block size acicular ferrite (AF) were investigated, focusing cementite formation. Block AF refined with increasing content coarsened content. inverse. did not necessarily become finer yield stress γ-phase driving force γ→α phase transformation. On other hand, became regardless when sympathetic/ autocatalytic nucleation frequency increased increased. This suggests that depleted zone formation promoted nucleation. effect number sites quantified.