Figure 5: Cross section of four steel substrates: (a) polished with ~1 Pm alumina suspension, (b) grit blasted with #120 grit, (c) grit blasted with #50 grit, (d) grit blasted with #12 grit. Top image shows optical interferometry scan of # 120 grit blasted surface.

Figure 5: Cross section of four steel substrates: (a) polished
with ~1 Pm alumina suspension, (b) grit blasted with #120
grit, (c) grit blasted with #50 grit, (d) grit blasted with #12
grit. Top image shows optical interferometry scan of # 120
grit blasted surface.