Wilbert Smith Archives Files Box 1131 19 1131-19-p070

Document Text (OCR)

+1 ii} nS eee ie Magnetic Metal The microstructure of the magnetic metal (Figure 3) has two major features: white acicular ferrite and dark pearlite, itself a lamellar eutectoid of cementite and ferrite. There are wide bands of ferrite at the original austenite grain boundaries that are responsible for the large bright : facets seen on the fracture surfaces of the sample broken from the main piece with a sledge hammer. This structure is typical of a cast, low-carbon steel. The grains showed no...