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As‐quenched low‐carbon martensitic steels (<0.2 wt.% C) contain auto‐tempered carbides. Auto‐tempering improves the work hardening and upper‐shelf impact energy; however, an efficient characterization method  to determine  the degree of auto‐tempering has not been available. This paper demonstrates an efficient  image processing  tool  that calculates  the  relative auto‐tempered carbide fraction by analyzing scanning electron microscope micrographs. By the process of image segmentation, the qualitative volume fraction of auto‐tempered carbides can be determined, and an associated  color map  produced, which  distinguished  the  levels  of  auto‐tempering.  This  image processing  tool  could become useful  for  the optimization of new  low‐carbon  steel’s mechanical properties.

Image Processing Tool Quantifying Auto-Tempered Carbides in As-Quenched Low Carbon Martensitic Steels