Wilbert Smith Archives Files Box 1131 19 1131-19-p058

Document Text (OCR)

~-. es 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 evidence of...