Dislocation density within lath martensite in Fe-C and Fe-Ni alloys

By S. Morito, J. Nishikawa, T. Maki. 2003

330 citations recorded by the source corpus.

Lath martensite structure has overwhelming industrial significance in most heat-treatable commercial steels. High dislocation density is one of major factors for high strength of lath martensite. It is known that the dislocation density in the lath martensite is an order of 10 or 10 m . However, the quantitative studies on the dislocation density in martensite are very few. One of the difficulties in the measurement of dislocation density by transmission electron microscopy is a determination of thin foil thickness. Kehoe and Kelly determined the foil thickness from extinction thickness fringes in an inclined boundary and measured the dislocation density within the laths in Fe–C alloys with carbon content from 0.01 to 0.1 mass%. They showed that the dislocation density increases with carbon content. However, the effect of carbon content more than 0.1% on the dislocation density is not clear yet. In the present paper, the dislocation densities within the lath martensite in Fe–C (0 to 0.8 mass% C) and Fe–Ni (0 to 23 mass% Ni) alloys were studied by TEM through precise determination of foil thickness using the convergent-beam electron diffraction (CBED) method.

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/223a6108525b28e663f5bb7c0911534a8800f365