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One of the most important aspects of fractographic analysis is the relationship between the fracture surface microtopography and the underlying microstructure. This type of correlation requires comparison of the size, shape, and spatial arrangement of both fractographic and microstructural features and identification of the specific microstructural features that adjoin the fracture surface. Two examples of qualitative fractographic-microstructural analyses conducted with a scanning electron microscope in ferrous alloys are presented. The first example involves brittle cracking of oriented Fe-3Si sheet during cold rolling and the second low tensile ductility in a hot-rolled 0.47C-1.6Mn steel.
fractography, microstructure, scanning electron microscopy, mechanical twinning, cleavage, ferrous alloys, ferrite, pearlite, prior austenite grain size, micro-cracking, materials, materials science
Senior research metallurgist, Armco, Inc., Research Center, Middletown, Ohio