Abstract
The effect of cold rolling and annealing on the structure of two lamination steels has been examined using scanning electron microscopy and transmission electron microscopy. It is demonstrated that the massive films of cementite (which are a characteristic of the hot rolled strip) are fragmented during cold rolling. Fracture of the massive films occurred in a brittle manner. Smaller cementite precipitates did not fail by brittle cracking but sometimes necked down leading to ductile failure. Annealing in either the two-phase ferrite plus cementite, or ferrite plus austenite regions led to the gradual development of cavities. It is likely that these cavities grew by the short-circuit diffusion of excess vacancies driven by pre-strains.
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Lee, J.W., Howell, P.R. Microstructural development in non-oriented lamination steels. J Mater Sci 25, 4785–4791 (1990). https://doi.org/10.1007/BF01129943
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DOI: https://doi.org/10.1007/BF01129943