142 Proceedincjs of Indiana Academy of Science 



In ordinary annealed hyper-eutectoid steel inclusions are generally 

 found within the cementite areas. In the case of hypo-eutectoid steel 

 they usually occur in the ferrite grains and ferrite network surrounding 



Fig. 1. a, Peailite Kiains (dark) and cementite (light) in annealed hyper-eutectoid 

 steel ; b, pearlite jrrains (dark) and ferrite (light) in annealed hypo-eutectoid steel ; 

 c, ini'lu?ion surrounded by cementite in hyper-eutectoid steel ; d, inclusions surrounded 

 by ferrite in hypo-eutectoid steel, a and b etched with nitric acd, c and d with 

 hydrochloric acid, x 80. 



pearlite grains but rarely in the pearlite grains themselves. Figure 

 Ic is a rather striking example of an inclusion surrounded by cementite 

 in hyper-eutectoid steel. Figure \d, .shows a hypo-eutectoid steel. It 



